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// -*- C++ -*-
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//===--------------------------- string -----------------------------------===//
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//
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//                     The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_STRING
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#define _LIBCPP_STRING
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/*
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    string synopsis
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namespace std
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{
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template <class stateT>
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class fpos
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{
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private:
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    stateT st;
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public:
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    fpos(streamoff = streamoff());
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    operator streamoff() const;
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    stateT state() const;
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    void state(stateT);
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    fpos& operator+=(streamoff);
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    fpos  operator+ (streamoff) const;
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    fpos& operator-=(streamoff);
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    fpos  operator- (streamoff) const;
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};
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template <class stateT> streamoff operator-(const fpos<stateT>& x, const fpos<stateT>& y);
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template <class stateT> bool operator==(const fpos<stateT>& x, const fpos<stateT>& y);
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template <class stateT> bool operator!=(const fpos<stateT>& x, const fpos<stateT>& y);
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template <class charT>
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struct char_traits
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{
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    typedef charT     char_type;
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    typedef ...       int_type;
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    typedef streamoff off_type;
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    typedef streampos pos_type;
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    typedef mbstate_t state_type;
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    static void assign(char_type& c1, const char_type& c2) noexcept;
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    static constexpr bool eq(char_type c1, char_type c2) noexcept;
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    static constexpr bool lt(char_type c1, char_type c2) noexcept;
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    static int              compare(const char_type* s1, const char_type* s2, size_t n);
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    static size_t           length(const char_type* s);
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    static const char_type* find(const char_type* s, size_t n, const char_type& a);
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    static char_type*       move(char_type* s1, const char_type* s2, size_t n);
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    static char_type*       copy(char_type* s1, const char_type* s2, size_t n);
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    static char_type*       assign(char_type* s, size_t n, char_type a);
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    static constexpr int_type  not_eof(int_type c) noexcept;
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    static constexpr char_type to_char_type(int_type c) noexcept;
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    static constexpr int_type  to_int_type(char_type c) noexcept;
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    static constexpr bool      eq_int_type(int_type c1, int_type c2) noexcept;
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    static constexpr int_type  eof() noexcept;
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};
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template <> struct char_traits<char>;
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template <> struct char_traits<wchar_t>;
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template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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class basic_string
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{
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public:
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// types:
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    typedef traits traits_type;
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    typedef typename traits_type::char_type value_type;
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    typedef Allocator allocator_type;
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    typedef typename allocator_type::size_type size_type;
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    typedef typename allocator_type::difference_type difference_type;
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    typedef typename allocator_type::reference reference;
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    typedef typename allocator_type::const_reference const_reference;
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    typedef typename allocator_type::pointer pointer;
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    typedef typename allocator_type::const_pointer const_pointer;
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    typedef implementation-defined iterator;
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    typedef implementation-defined const_iterator;
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    typedef std::reverse_iterator<iterator> reverse_iterator;
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    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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    static const size_type npos = -1;
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    basic_string()
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        noexcept(is_nothrow_default_constructible<allocator_type>::value);
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    explicit basic_string(const allocator_type& a);
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    basic_string(const basic_string& str);
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    basic_string(basic_string&& str)
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        noexcept(is_nothrow_move_constructible<allocator_type>::value);
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    basic_string(const basic_string& str, size_type pos, size_type n = npos,
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                 const allocator_type& a = allocator_type());
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    basic_string(const value_type* s, const allocator_type& a = allocator_type());
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    basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type());
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    basic_string(size_type n, value_type c, const allocator_type& a = allocator_type());
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    template<class InputIterator>
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        basic_string(InputIterator begin, InputIterator end,
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                     const allocator_type& a = allocator_type());
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    basic_string(initializer_list<value_type>, const Allocator& = Allocator());
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    basic_string(const basic_string&, const Allocator&);
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    basic_string(basic_string&&, const Allocator&);
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    ~basic_string();
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    basic_string& operator=(const basic_string& str);
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    basic_string& operator=(basic_string&& str)
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        noexcept(
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             allocator_type::propagate_on_container_move_assignment::value ||
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             allocator_type::is_always_equal::value ); // C++17
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    basic_string& operator=(const value_type* s);
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    basic_string& operator=(value_type c);
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    basic_string& operator=(initializer_list<value_type>);
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    iterator       begin() noexcept;
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    const_iterator begin() const noexcept;
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    iterator       end() noexcept;
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    const_iterator end() const noexcept;
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    reverse_iterator       rbegin() noexcept;
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    const_reverse_iterator rbegin() const noexcept;
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    reverse_iterator       rend() noexcept;
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    const_reverse_iterator rend() const noexcept;
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    const_iterator         cbegin() const noexcept;
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    const_iterator         cend() const noexcept;
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    const_reverse_iterator crbegin() const noexcept;
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    const_reverse_iterator crend() const noexcept;
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    size_type size() const noexcept;
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    size_type length() const noexcept;
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    size_type max_size() const noexcept;
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    size_type capacity() const noexcept;
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    void resize(size_type n, value_type c);
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    void resize(size_type n);
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    void reserve(size_type res_arg = 0);
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    void shrink_to_fit();
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    void clear() noexcept;
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    bool empty() const noexcept;
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    const_reference operator[](size_type pos) const;
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    reference       operator[](size_type pos);
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    const_reference at(size_type n) const;
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    reference       at(size_type n);
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    basic_string& operator+=(const basic_string& str);
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    basic_string& operator+=(const value_type* s);
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    basic_string& operator+=(value_type c);
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    basic_string& operator+=(initializer_list<value_type>);
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    basic_string& append(const basic_string& str);
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    basic_string& append(const basic_string& str, size_type pos, size_type n=npos); //C++14
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    basic_string& append(const value_type* s, size_type n);
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    basic_string& append(const value_type* s);
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    basic_string& append(size_type n, value_type c);
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    template<class InputIterator>
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        basic_string& append(InputIterator first, InputIterator last);
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    basic_string& append(initializer_list<value_type>);
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    void push_back(value_type c);
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    void pop_back();
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    reference       front();
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    const_reference front() const;
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    reference       back();
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    const_reference back() const;
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    basic_string& assign(const basic_string& str);
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    basic_string& assign(basic_string&& str);
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    basic_string& assign(const basic_string& str, size_type pos, size_type n=npos); // C++14
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    basic_string& assign(const value_type* s, size_type n);
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    basic_string& assign(const value_type* s);
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    basic_string& assign(size_type n, value_type c);
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    template<class InputIterator>
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        basic_string& assign(InputIterator first, InputIterator last);
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    basic_string& assign(initializer_list<value_type>);
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    basic_string& insert(size_type pos1, const basic_string& str);
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    basic_string& insert(size_type pos1, const basic_string& str,
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                         size_type pos2, size_type n);
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    basic_string& insert(size_type pos, const value_type* s, size_type n=npos); //C++14
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    basic_string& insert(size_type pos, const value_type* s);
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    basic_string& insert(size_type pos, size_type n, value_type c);
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    iterator      insert(const_iterator p, value_type c);
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    iterator      insert(const_iterator p, size_type n, value_type c);
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    template<class InputIterator>
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        iterator insert(const_iterator p, InputIterator first, InputIterator last);
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    iterator      insert(const_iterator p, initializer_list<value_type>);
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    basic_string& erase(size_type pos = 0, size_type n = npos);
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    iterator      erase(const_iterator position);
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    iterator      erase(const_iterator first, const_iterator last);
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    basic_string& replace(size_type pos1, size_type n1, const basic_string& str);
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    basic_string& replace(size_type pos1, size_type n1, const basic_string& str,
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                          size_type pos2, size_type n2=npos); // C++14
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    basic_string& replace(size_type pos, size_type n1, const value_type* s, size_type n2);
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    basic_string& replace(size_type pos, size_type n1, const value_type* s);
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    basic_string& replace(size_type pos, size_type n1, size_type n2, value_type c);
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    basic_string& replace(const_iterator i1, const_iterator i2, const basic_string& str);
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    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s, size_type n);
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    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s);
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    basic_string& replace(const_iterator i1, const_iterator i2, size_type n, value_type c);
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    template<class InputIterator>
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        basic_string& replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2);
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    basic_string& replace(const_iterator i1, const_iterator i2, initializer_list<value_type>);
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    size_type copy(value_type* s, size_type n, size_type pos = 0) const;
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    basic_string substr(size_type pos = 0, size_type n = npos) const;
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    void swap(basic_string& str)
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        noexcept(allocator_traits<allocator_type>::propagate_on_container_swap::value ||
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                 allocator_traits<allocator_type>::is_always_equal::value);  // C++17
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    const value_type* c_str() const noexcept;
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    const value_type* data() const noexcept;
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    allocator_type get_allocator() const noexcept;
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    size_type find(const basic_string& str, size_type pos = 0) const noexcept;
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    size_type find(const value_type* s, size_type pos, size_type n) const noexcept;
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    size_type find(const value_type* s, size_type pos = 0) const noexcept;
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    size_type find(value_type c, size_type pos = 0) const noexcept;
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    size_type rfind(const basic_string& str, size_type pos = npos) const noexcept;
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    size_type rfind(const value_type* s, size_type pos, size_type n) const noexcept;
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    size_type rfind(const value_type* s, size_type pos = npos) const noexcept;
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    size_type rfind(value_type c, size_type pos = npos) const noexcept;
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    size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept;
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    size_type find_first_of(const value_type* s, size_type pos, size_type n) const noexcept;
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    size_type find_first_of(const value_type* s, size_type pos = 0) const noexcept;
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    size_type find_first_of(value_type c, size_type pos = 0) const noexcept;
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    size_type find_last_of(const basic_string& str, size_type pos = npos) const noexcept;
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    size_type find_last_of(const value_type* s, size_type pos, size_type n) const noexcept;
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    size_type find_last_of(const value_type* s, size_type pos = npos) const noexcept;
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    size_type find_last_of(value_type c, size_type pos = npos) const noexcept;
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    size_type find_first_not_of(const basic_string& str, size_type pos = 0) const noexcept;
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    size_type find_first_not_of(const value_type* s, size_type pos, size_type n) const noexcept;
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    size_type find_first_not_of(const value_type* s, size_type pos = 0) const noexcept;
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    size_type find_first_not_of(value_type c, size_type pos = 0) const noexcept;
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    size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept;
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    size_type find_last_not_of(const value_type* s, size_type pos, size_type n) const noexcept;
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    size_type find_last_not_of(const value_type* s, size_type pos = npos) const noexcept;
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    size_type find_last_not_of(value_type c, size_type pos = npos) const noexcept;
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    int compare(const basic_string& str) const noexcept;
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    int compare(size_type pos1, size_type n1, const basic_string& str) const;
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    int compare(size_type pos1, size_type n1, const basic_string& str,
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                size_type pos2, size_type n2=npos) const; // C++14
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    int compare(const value_type* s) const noexcept;
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    int compare(size_type pos1, size_type n1, const value_type* s) const;
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    int compare(size_type pos1, size_type n1, const value_type* s, size_type n2) const;
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    bool __invariants() const;
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};
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template<class charT, class traits, class Allocator>
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basic_string<charT, traits, Allocator>
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operator+(const basic_string<charT, traits, Allocator>& lhs,
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          const basic_string<charT, traits, Allocator>& rhs);
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template<class charT, class traits, class Allocator>
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basic_string<charT, traits, Allocator>
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operator+(const charT* lhs , const basic_string<charT,traits,Allocator>&rhs);
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template<class charT, class traits, class Allocator>
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basic_string<charT, traits, Allocator>
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operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs);
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template<class charT, class traits, class Allocator>
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basic_string<charT, traits, Allocator>
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operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);
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template<class charT, class traits, class Allocator>
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basic_string<charT, traits, Allocator>
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operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs);
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template<class charT, class traits, class Allocator>
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bool operator==(const basic_string<charT, traits, Allocator>& lhs,
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                const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator==(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator==(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator!=(const basic_string<charT,traits,Allocator>& lhs,
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                const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator< (const basic_string<charT, traits, Allocator>& lhs,
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                const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator< (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator< (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator> (const basic_string<charT, traits, Allocator>& lhs,
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                const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator> (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator> (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator<=(const basic_string<charT, traits, Allocator>& lhs,
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                const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator<=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator<=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator>=(const basic_string<charT, traits, Allocator>& lhs,
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                const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator>=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;
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template<class charT, class traits, class Allocator>
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bool operator>=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
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template<class charT, class traits, class Allocator>
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void swap(basic_string<charT, traits, Allocator>& lhs,
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          basic_string<charT, traits, Allocator>& rhs)
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            noexcept(noexcept(lhs.swap(rhs)));
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template<class charT, class traits, class Allocator>
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basic_istream<charT, traits>&
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operator>>(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);
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template<class charT, class traits, class Allocator>
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basic_ostream<charT, traits>&
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operator<<(basic_ostream<charT, traits>& os, const basic_string<charT, traits, Allocator>& str);
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template<class charT, class traits, class Allocator>
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basic_istream<charT, traits>&
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getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str,
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        charT delim);
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template<class charT, class traits, class Allocator>
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basic_istream<charT, traits>&
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getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);
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typedef basic_string<char>    string;
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typedef basic_string<wchar_t> wstring;
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typedef basic_string<char16_t> u16string;
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typedef basic_string<char32_t> u32string;
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int                stoi  (const string& str, size_t* idx = 0, int base = 10);
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long               stol  (const string& str, size_t* idx = 0, int base = 10);
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unsigned long      stoul (const string& str, size_t* idx = 0, int base = 10);
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long long          stoll (const string& str, size_t* idx = 0, int base = 10);
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unsigned long long stoull(const string& str, size_t* idx = 0, int base = 10);
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float       stof (const string& str, size_t* idx = 0);
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double      stod (const string& str, size_t* idx = 0);
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long double stold(const string& str, size_t* idx = 0);
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string to_string(int val);
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string to_string(unsigned val);
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string to_string(long val);
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string to_string(unsigned long val);
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string to_string(long long val);
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string to_string(unsigned long long val);
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string to_string(float val);
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string to_string(double val);
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string to_string(long double val);
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int                stoi  (const wstring& str, size_t* idx = 0, int base = 10);
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long               stol  (const wstring& str, size_t* idx = 0, int base = 10);
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unsigned long      stoul (const wstring& str, size_t* idx = 0, int base = 10);
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long long          stoll (const wstring& str, size_t* idx = 0, int base = 10);
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unsigned long long stoull(const wstring& str, size_t* idx = 0, int base = 10);
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float       stof (const wstring& str, size_t* idx = 0);
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double      stod (const wstring& str, size_t* idx = 0);
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long double stold(const wstring& str, size_t* idx = 0);
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wstring to_wstring(int val);
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wstring to_wstring(unsigned val);
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wstring to_wstring(long val);
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wstring to_wstring(unsigned long val);
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wstring to_wstring(long long val);
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wstring to_wstring(unsigned long long val);
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wstring to_wstring(float val);
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wstring to_wstring(double val);
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wstring to_wstring(long double val);
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template <> struct hash<string>;
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template <> struct hash<u16string>;
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template <> struct hash<u32string>;
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template <> struct hash<wstring>;
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basic_string<char>     operator "" s( const char *str,     size_t len ); // C++14
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basic_string<wchar_t>  operator "" s( const wchar_t *str,  size_t len ); // C++14
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basic_string<char16_t> operator "" s( const char16_t *str, size_t len ); // C++14
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basic_string<char32_t> operator "" s( const char32_t *str, size_t len ); // C++14
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}  // std
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*/
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#include <__config>
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#include <iosfwd>
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#include <cstring>
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#include <cstdio>  // For EOF.
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#include <cwchar>
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#include <algorithm>
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#include <iterator>
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#include <utility>
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#include <memory>
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#include <stdexcept>
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#include <type_traits>
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#include <initializer_list>
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#include <__functional_base>
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#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
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#include <cstdint>
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#endif
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#if defined(_LIBCPP_NO_EXCEPTIONS)
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#include <cassert>
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#endif
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#include <__undef_min_max>
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#include <__debug>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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// fpos
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template <class _StateT>
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class _LIBCPP_TYPE_VIS_ONLY fpos
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{
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private:
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    _StateT __st_;
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    streamoff __off_;
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public:
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    _LIBCPP_INLINE_VISIBILITY fpos(streamoff __off = streamoff()) : __st_(), __off_(__off) {}
474
475
    _LIBCPP_INLINE_VISIBILITY operator streamoff() const {return __off_;}
476
477
    _LIBCPP_INLINE_VISIBILITY _StateT state() const {return __st_;}
478
    _LIBCPP_INLINE_VISIBILITY void state(_StateT __st) {__st_ = __st;}
479
480
    _LIBCPP_INLINE_VISIBILITY fpos& operator+=(streamoff __off) {__off_ += __off; return *this;}
481
    _LIBCPP_INLINE_VISIBILITY fpos  operator+ (streamoff __off) const {fpos __t(*this); __t += __off; return __t;}
482
    _LIBCPP_INLINE_VISIBILITY fpos& operator-=(streamoff __off) {__off_ -= __off; return *this;}
483
    _LIBCPP_INLINE_VISIBILITY fpos  operator- (streamoff __off) const {fpos __t(*this); __t -= __off; return __t;}
484
};
485
486
template <class _StateT>
487
inline _LIBCPP_INLINE_VISIBILITY
488
streamoff operator-(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
489
    {return streamoff(__x) - streamoff(__y);}
490
491
template <class _StateT>
492
inline _LIBCPP_INLINE_VISIBILITY
493
bool operator==(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
494
    {return streamoff(__x) == streamoff(__y);}
495
496
template <class _StateT>
497
inline _LIBCPP_INLINE_VISIBILITY
498
bool operator!=(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
499
    {return streamoff(__x) != streamoff(__y);}
500
501
// char_traits
502
503
template <class _CharT>
504
struct _LIBCPP_TYPE_VIS_ONLY char_traits
505
{
506
    typedef _CharT    char_type;
507
    typedef int       int_type;
508
    typedef streamoff off_type;
509
    typedef streampos pos_type;
510
    typedef mbstate_t state_type;
511
512
    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
513
        {__c1 = __c2;}
514
    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
515
        {return __c1 == __c2;}
516
    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
517
        {return __c1 < __c2;}
518
519
    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
520
    static size_t           length(const char_type* __s);
521
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
522
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
523
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
524
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);
525
526
    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
527
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
528
    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
529
        {return char_type(__c);}
530
    static inline _LIBCPP_CONSTEXPR int_type  to_int_type(char_type __c) _NOEXCEPT
531
        {return int_type(__c);}
532
    static inline _LIBCPP_CONSTEXPR bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
533
        {return __c1 == __c2;}
534
    static inline _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
535
        {return int_type(EOF);}
536
};
537
538
template <class _CharT>
539
int
540
char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
541
{
542
    for (; __n; --__n, ++__s1, ++__s2)
543
    {
544
        if (lt(*__s1, *__s2))
545
            return -1;
546
        if (lt(*__s2, *__s1))
547
            return 1;
548
    }
549
    return 0;
550
}
551
552
template <class _CharT>
553
inline _LIBCPP_INLINE_VISIBILITY
554
size_t
555
char_traits<_CharT>::length(const char_type* __s)
556
{
557
    size_t __len = 0;
558
    for (; !eq(*__s, char_type(0)); ++__s)
559
        ++__len;
560
    return __len;
561
}
562
563
template <class _CharT>
564
inline _LIBCPP_INLINE_VISIBILITY
565
const _CharT*
566
char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a)
567
{
568
    for (; __n; --__n)
569
    {
570
        if (eq(*__s, __a))
571
            return __s;
572
        ++__s;
573
    }
574
    return 0;
575
}
576
577
template <class _CharT>
578
_CharT*
579
char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n)
580
{
581
    char_type* __r = __s1;
582
    if (__s1 < __s2)
583
    {
584
        for (; __n; --__n, ++__s1, ++__s2)
585
            assign(*__s1, *__s2);
586
    }
587
    else if (__s2 < __s1)
588
    {
589
        __s1 += __n;
590
        __s2 += __n;
591
        for (; __n; --__n)
592
            assign(*--__s1, *--__s2);
593
    }
594
    return __r;
595
}
596
597
template <class _CharT>
598
inline _LIBCPP_INLINE_VISIBILITY
599
_CharT*
600
char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n)
601
{
602
    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
603
    char_type* __r = __s1;
604
    for (; __n; --__n, ++__s1, ++__s2)
605
        assign(*__s1, *__s2);
606
    return __r;
607
}
608
609
template <class _CharT>
610
inline _LIBCPP_INLINE_VISIBILITY
611
_CharT*
612
char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a)
613
{
614
    char_type* __r = __s;
615
    for (; __n; --__n, ++__s)
616
        assign(*__s, __a);
617
    return __r;
618
}
619
620
// char_traits<char>
621
622
template <>
623
struct _LIBCPP_TYPE_VIS_ONLY char_traits<char>
624
{
625
    typedef char      char_type;
626
    typedef int       int_type;
627
    typedef streamoff off_type;
628
    typedef streampos pos_type;
629
    typedef mbstate_t state_type;
630
631
    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
632
        {__c1 = __c2;}
633
    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
634
            {return __c1 == __c2;}
635
    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
636
        {return (unsigned char)__c1 < (unsigned char)__c2;}
637
638
    static inline int compare(const char_type* __s1, const char_type* __s2, size_t __n)
639
        {return __n == 0 ? 0 : memcmp(__s1, __s2, __n);}
640
    static inline size_t length(const char_type* __s) {return strlen(__s);}
641
    static inline const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
642
        {return __n == 0 ? NULL : (const char_type*) memchr(__s, to_int_type(__a), __n);}
643
    static inline char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
644
        {return __n == 0 ? __s1 : (char_type*) memmove(__s1, __s2, __n);}
645
    static inline char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
646
        {
647
            _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
648
            return __n == 0 ? __s1 : (char_type*)memcpy(__s1, __s2, __n);
649
        }
650
    static inline char_type* assign(char_type* __s, size_t __n, char_type __a)
651
        {return __n == 0 ? __s : (char_type*)memset(__s, to_int_type(__a), __n);}
652
653
    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
654
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
655
    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
656
        {return char_type(__c);}
657
    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
658
        {return int_type((unsigned char)__c);}
659
    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
660
        {return __c1 == __c2;}
661
    static inline _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
662
        {return int_type(EOF);}
663
};
664
665
// char_traits<wchar_t>
666
667
template <>
668
struct _LIBCPP_TYPE_VIS_ONLY char_traits<wchar_t>
669
{
670
    typedef wchar_t   char_type;
671
    typedef wint_t    int_type;
672
    typedef streamoff off_type;
673
    typedef streampos pos_type;
674
    typedef mbstate_t state_type;
675
676
    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
677
        {__c1 = __c2;}
678
    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
679
        {return __c1 == __c2;}
680
    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
681
        {return __c1 < __c2;}
682
683
    static inline int compare(const char_type* __s1, const char_type* __s2, size_t __n)
684
        {return __n == 0 ? 0 : wmemcmp(__s1, __s2, __n);}
685
    static inline size_t length(const char_type* __s)
686
        {return wcslen(__s);}
687
    static inline const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
688
        {return __n == 0 ? NULL : (const char_type*)wmemchr(__s, __a, __n);}
689
    static inline char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
690
        {return __n == 0 ? __s1 : (char_type*)wmemmove(__s1, __s2, __n);}
691
    static inline char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
692
        {
693
            _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
694
            return __n == 0 ? __s1 : (char_type*)wmemcpy(__s1, __s2, __n);
695
        }
696
    static inline char_type* assign(char_type* __s, size_t __n, char_type __a)
697
        {return __n == 0 ? __s : (char_type*)wmemset(__s, __a, __n);}
698
699
    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
700
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
701
    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
702
        {return char_type(__c);}
703
    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
704
        {return int_type(__c);}
705
    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
706
        {return __c1 == __c2;}
707
    static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
708
        {return int_type(WEOF);}
709
};
710
711
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
712
713
template <>
714
struct _LIBCPP_TYPE_VIS_ONLY char_traits<char16_t>
715
{
716
    typedef char16_t       char_type;
717
    typedef uint_least16_t int_type;
718
    typedef streamoff      off_type;
719
    typedef u16streampos   pos_type;
720
    typedef mbstate_t      state_type;
721
722
    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
723
        {__c1 = __c2;}
724
    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
725
        {return __c1 == __c2;}
726
    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
727
        {return __c1 < __c2;}
728
729
    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
730
    static size_t           length(const char_type* __s);
731
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
732
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
733
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
734
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);
735
736
    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
737
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
738
    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
739
        {return char_type(__c);}
740
    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
741
        {return int_type(__c);}
742
    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
743
        {return __c1 == __c2;}
744
    static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
745
        {return int_type(0xFFFF);}
746
};
747
748
inline _LIBCPP_INLINE_VISIBILITY
749
int
750
char_traits<char16_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
751
{
752
    for (; __n; --__n, ++__s1, ++__s2)
753
    {
754
        if (lt(*__s1, *__s2))
755
            return -1;
756
        if (lt(*__s2, *__s1))
757
            return 1;
758
    }
759
    return 0;
760
}
761
762
inline _LIBCPP_INLINE_VISIBILITY
763
size_t
764
char_traits<char16_t>::length(const char_type* __s)
765
{
766
    size_t __len = 0;
767
    for (; !eq(*__s, char_type(0)); ++__s)
768
        ++__len;
769
    return __len;
770
}
771
772
inline _LIBCPP_INLINE_VISIBILITY
773
const char16_t*
774
char_traits<char16_t>::find(const char_type* __s, size_t __n, const char_type& __a)
775
{
776
    for (; __n; --__n)
777
    {
778
        if (eq(*__s, __a))
779
            return __s;
780
        ++__s;
781
    }
782
    return 0;
783
}
784
785
inline _LIBCPP_INLINE_VISIBILITY
786
char16_t*
787
char_traits<char16_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
788
{
789
    char_type* __r = __s1;
790
    if (__s1 < __s2)
791
    {
792
        for (; __n; --__n, ++__s1, ++__s2)
793
            assign(*__s1, *__s2);
794
    }
795
    else if (__s2 < __s1)
796
    {
797
        __s1 += __n;
798
        __s2 += __n;
799
        for (; __n; --__n)
800
            assign(*--__s1, *--__s2);
801
    }
802
    return __r;
803
}
804
805
inline _LIBCPP_INLINE_VISIBILITY
806
char16_t*
807
char_traits<char16_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
808
{
809
    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
810
    char_type* __r = __s1;
811
    for (; __n; --__n, ++__s1, ++__s2)
812
        assign(*__s1, *__s2);
813
    return __r;
814
}
815
816
inline _LIBCPP_INLINE_VISIBILITY
817
char16_t*
818
char_traits<char16_t>::assign(char_type* __s, size_t __n, char_type __a)
819
{
820
    char_type* __r = __s;
821
    for (; __n; --__n, ++__s)
822
        assign(*__s, __a);
823
    return __r;
824
}
825
826
template <>
827
struct _LIBCPP_TYPE_VIS_ONLY char_traits<char32_t>
828
{
829
    typedef char32_t       char_type;
830
    typedef uint_least32_t int_type;
831
    typedef streamoff      off_type;
832
    typedef u32streampos   pos_type;
833
    typedef mbstate_t      state_type;
834
835
    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
836
        {__c1 = __c2;}
837
    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
838
        {return __c1 == __c2;}
839
    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
840
        {return __c1 < __c2;}
841
842
    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
843
    static size_t           length(const char_type* __s);
844
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
845
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
846
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
847
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);
848
849
    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
850
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
851
    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
852
        {return char_type(__c);}
853
    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
854
        {return int_type(__c);}
855
    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
856
        {return __c1 == __c2;}
857
    static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
858
        {return int_type(0xFFFFFFFF);}
859
};
860
861
inline _LIBCPP_INLINE_VISIBILITY
862
int
863
char_traits<char32_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
864
{
865
    for (; __n; --__n, ++__s1, ++__s2)
866
    {
867
        if (lt(*__s1, *__s2))
868
            return -1;
869
        if (lt(*__s2, *__s1))
870
            return 1;
871
    }
872
    return 0;
873
}
874
875
inline _LIBCPP_INLINE_VISIBILITY
876
size_t
877
char_traits<char32_t>::length(const char_type* __s)
878
{
879
    size_t __len = 0;
880
    for (; !eq(*__s, char_type(0)); ++__s)
881
        ++__len;
882
    return __len;
883
}
884
885
inline _LIBCPP_INLINE_VISIBILITY
886
const char32_t*
887
char_traits<char32_t>::find(const char_type* __s, size_t __n, const char_type& __a)
888
{
889
    for (; __n; --__n)
890
    {
891
        if (eq(*__s, __a))
892
            return __s;
893
        ++__s;
894
    }
895
    return 0;
896
}
897
898
inline _LIBCPP_INLINE_VISIBILITY
899
char32_t*
900
char_traits<char32_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
901
{
902
    char_type* __r = __s1;
903
    if (__s1 < __s2)
904
    {
905
        for (; __n; --__n, ++__s1, ++__s2)
906
            assign(*__s1, *__s2);
907
    }
908
    else if (__s2 < __s1)
909
    {
910
        __s1 += __n;
911
        __s2 += __n;
912
        for (; __n; --__n)
913
            assign(*--__s1, *--__s2);
914
    }
915
    return __r;
916
}
917
918
inline _LIBCPP_INLINE_VISIBILITY
919
char32_t*
920
char_traits<char32_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
921
{
922
    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
923
    char_type* __r = __s1;
924
    for (; __n; --__n, ++__s1, ++__s2)
925
        assign(*__s1, *__s2);
926
    return __r;
927
}
928
929
inline _LIBCPP_INLINE_VISIBILITY
930
char32_t*
931
char_traits<char32_t>::assign(char_type* __s, size_t __n, char_type __a)
932
{
933
    char_type* __r = __s;
934
    for (; __n; --__n, ++__s)
935
        assign(*__s, __a);
936
    return __r;
937
}
938
939
#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
940
941
// helper fns for basic_string
942
943
// __str_find
944
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
945
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
946
__str_find(const _CharT *__p, _SizeT __sz,
947
             _CharT __c, _SizeT __pos) _NOEXCEPT
948
{
949
    if (__pos >= __sz)
950
        return __npos;
951
    const _CharT* __r = _Traits::find(__p + __pos, __sz - __pos, __c);
952
    if (__r == 0)
953
        return __npos;
954
    return static_cast<_SizeT>(__r - __p);
955
}
956
957
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
958
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
959
__str_find(const _CharT *__p, _SizeT __sz,
960
       const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
961
{
962
    if (__pos > __sz || __sz - __pos < __n)
963
        return __npos;
964
    if (__n == 0)
965
        return __pos;
966
    const _CharT* __r =
967
        _VSTD::__search(__p + __pos, __p + __sz,
968
                        __s, __s + __n, _Traits::eq,
969
                        random_access_iterator_tag(), random_access_iterator_tag());
970
    if (__r == __p + __sz)
971
        return __npos;
972
    return static_cast<_SizeT>(__r - __p);
973
}
974
975
976
// __str_rfind
977
978
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
979
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
980
__str_rfind(const _CharT *__p, _SizeT __sz,
981
              _CharT __c, _SizeT __pos) _NOEXCEPT
982
{
983
    if (__sz < 1)
984
        return __npos;
985
    if (__pos < __sz)
986
        ++__pos;
987
    else
988
        __pos = __sz;
989
    for (const _CharT* __ps = __p + __pos; __ps != __p;)
990
    {
991
        if (_Traits::eq(*--__ps, __c))
992
            return static_cast<_SizeT>(__ps - __p);
993
    }
994
    return __npos;
995
}
996
997
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
998
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
999
__str_rfind(const _CharT *__p, _SizeT __sz,
1000
        const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
1001
{
1002
    __pos = _VSTD::min(__pos, __sz);
1003
    if (__n < __sz - __pos)
1004
        __pos += __n;
1005
    else
1006
        __pos = __sz;
1007
    const _CharT* __r = _VSTD::__find_end(
1008
                  __p, __p + __pos, __s, __s + __n, _Traits::eq,
1009
                        random_access_iterator_tag(), random_access_iterator_tag());
1010
    if (__n > 0 && __r == __p + __pos)
1011
        return __npos;
1012
    return static_cast<_SizeT>(__r - __p);
1013
}
1014
1015
// __str_find_first_of
1016
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
1017
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1018
__str_find_first_of(const _CharT *__p, _SizeT __sz,
1019
                const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
1020
{
1021
    if (__pos >= __sz || __n == 0)
1022
        return __npos;
1023
    const _CharT* __r = _VSTD::__find_first_of_ce
1024
        (__p + __pos, __p + __sz, __s, __s + __n, _Traits::eq );
1025
    if (__r == __p + __sz)
1026
        return __npos;
1027
    return static_cast<_SizeT>(__r - __p);
1028
}
1029
1030
1031
// __str_find_last_of
1032
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
1033
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1034
__str_find_last_of(const _CharT *__p, _SizeT __sz,
1035
               const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
1036
    {
1037
    if (__n != 0)
1038
    {
1039
        if (__pos < __sz)
1040
            ++__pos;
1041
        else
1042
            __pos = __sz;
1043
        for (const _CharT* __ps = __p + __pos; __ps != __p;)
1044
        {
1045
            const _CharT* __r = _Traits::find(__s, __n, *--__ps);
1046
            if (__r)
1047
                return static_cast<_SizeT>(__ps - __p);
1048
        }
1049
    }
1050
    return __npos;
1051
}
1052
1053
1054
// __str_find_first_not_of
1055
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
1056
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1057
__str_find_first_not_of(const _CharT *__p, _SizeT __sz,
1058
                    const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
1059
{
1060
    if (__pos < __sz)
1061
    {
1062
        const _CharT* __pe = __p + __sz;
1063
        for (const _CharT* __ps = __p + __pos; __ps != __pe; ++__ps)
1064
            if (_Traits::find(__s, __n, *__ps) == 0)
1065
                return static_cast<_SizeT>(__ps - __p);
1066
    }
1067
    return __npos;
1068
}
1069
1070
1071
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
1072
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1073
__str_find_first_not_of(const _CharT *__p, _SizeT __sz,
1074
                          _CharT __c, _SizeT __pos) _NOEXCEPT
1075
{
1076
    if (__pos < __sz)
1077
    {
1078
        const _CharT* __pe = __p + __sz;
1079
        for (const _CharT* __ps = __p + __pos; __ps != __pe; ++__ps)
1080
            if (!_Traits::eq(*__ps, __c))
1081
                return static_cast<_SizeT>(__ps - __p);
1082
    }
1083
    return __npos;
1084
}
1085
1086
1087
// __str_find_last_not_of
1088
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
1089
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1090
__str_find_last_not_of(const _CharT *__p, _SizeT __sz,
1091
                   const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
1092
{
1093
    if (__pos < __sz)
1094
        ++__pos;
1095
    else
1096
        __pos = __sz;
1097
    for (const _CharT* __ps = __p + __pos; __ps != __p;)
1098
        if (_Traits::find(__s, __n, *--__ps) == 0)
1099
            return static_cast<_SizeT>(__ps - __p);
1100
    return __npos;
1101
}
1102
1103
1104
template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
1105
_SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
1106
__str_find_last_not_of(const _CharT *__p, _SizeT __sz,
1107
                         _CharT __c, _SizeT __pos) _NOEXCEPT
1108
{
1109
    if (__pos < __sz)
1110
        ++__pos;
1111
    else
1112
        __pos = __sz;
1113
    for (const _CharT* __ps = __p + __pos; __ps != __p;)
1114
        if (!_Traits::eq(*--__ps, __c))
1115
            return static_cast<_SizeT>(__ps - __p);
1116
    return __npos;
1117
}
1118
1119
template<class _Ptr>
1120
size_t _LIBCPP_INLINE_VISIBILITY __do_string_hash(_Ptr __p, _Ptr __e)
1121
{
1122
    typedef typename iterator_traits<_Ptr>::value_type value_type;
1123
    return __murmur2_or_cityhash<size_t>()(__p, (__e-__p)*sizeof(value_type));
1124
}
1125
1126
// basic_string
1127
1128
template<class _CharT, class _Traits, class _Allocator>
1129
basic_string<_CharT, _Traits, _Allocator>
1130
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x,
1131
          const basic_string<_CharT, _Traits, _Allocator>& __y);
1132
1133
template<class _CharT, class _Traits, class _Allocator>
1134
basic_string<_CharT, _Traits, _Allocator>
1135
operator+(const _CharT* __x, const basic_string<_CharT,_Traits,_Allocator>& __y);
1136
1137
template<class _CharT, class _Traits, class _Allocator>
1138
basic_string<_CharT, _Traits, _Allocator>
1139
operator+(_CharT __x, const basic_string<_CharT,_Traits,_Allocator>& __y);
1140
1141
template<class _CharT, class _Traits, class _Allocator>
1142
basic_string<_CharT, _Traits, _Allocator>
1143
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, const _CharT* __y);
1144
1145
template<class _CharT, class _Traits, class _Allocator>
1146
basic_string<_CharT, _Traits, _Allocator>
1147
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, _CharT __y);
1148
1149
template <bool>
1150
class _LIBCPP_TYPE_VIS_ONLY __basic_string_common
1151
{
1152
protected:
1153
    void __throw_length_error() const;
1154
    void __throw_out_of_range() const;
1155
};
1156
1157
template <bool __b>
1158
void
1159
__basic_string_common<__b>::__throw_length_error() const
1160
{
1161
#ifndef _LIBCPP_NO_EXCEPTIONS
1162
    throw length_error("basic_string");
1163
#else
1164
    assert(!"basic_string length_error");
1165
#endif
1166
}
1167
1168
template <bool __b>
1169
void
1170
__basic_string_common<__b>::__throw_out_of_range() const
1171
{
1172
#ifndef _LIBCPP_NO_EXCEPTIONS
1173
    throw out_of_range("basic_string");
1174
#else
1175
    assert(!"basic_string out_of_range");
1176
#endif
1177
}
1178
1179
#ifdef _LIBCPP_MSVC
1180
#pragma warning( push )
1181
#pragma warning( disable: 4231 )
1182
#endif // _LIBCPP_MSVC
1183
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS __basic_string_common<true>)
1184
#ifdef _LIBCPP_MSVC
1185
#pragma warning( pop )
1186
#endif // _LIBCPP_MSVC
1187
1188
#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT
1189
1190
template <class _CharT, size_t = sizeof(_CharT)>
1191
struct __padding
1192
{
1193
    unsigned char __xx[sizeof(_CharT)-1];
1194
};
1195
1196
template <class _CharT>
1197
struct __padding<_CharT, 1>
1198
{
1199
};
1200
1201
#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT
1202
1203
template<class _CharT, class _Traits, class _Allocator>
1204
class _LIBCPP_TYPE_VIS_ONLY basic_string
1205
    : private __basic_string_common<true>
1206
{
1207
public:
1208
    typedef basic_string                                 __self;
1209
    typedef _Traits                                      traits_type;
1210
    typedef typename traits_type::char_type              value_type;
1211
    typedef _Allocator                                   allocator_type;
1212
    typedef allocator_traits<allocator_type>             __alloc_traits;
1213
    typedef typename __alloc_traits::size_type           size_type;
1214
    typedef typename __alloc_traits::difference_type     difference_type;
1215
    typedef value_type&                                  reference;
1216
    typedef const value_type&                            const_reference;
1217
    typedef typename __alloc_traits::pointer             pointer;
1218
    typedef typename __alloc_traits::const_pointer       const_pointer;
1219
1220
    static_assert(is_pod<value_type>::value, "Character type of basic_string must be a POD");
1221
    static_assert((is_same<_CharT, value_type>::value),
1222
                  "traits_type::char_type must be the same type as CharT");
1223
    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
1224
                  "Allocator::value_type must be same type as value_type");
1225
#if defined(_LIBCPP_RAW_ITERATORS)
1226
    typedef pointer                                      iterator;
1227
    typedef const_pointer                                const_iterator;
1228
#else  // defined(_LIBCPP_RAW_ITERATORS)
1229
    typedef __wrap_iter<pointer>                         iterator;
1230
    typedef __wrap_iter<const_pointer>                   const_iterator;
1231
#endif  // defined(_LIBCPP_RAW_ITERATORS)
1232
    typedef _VSTD::reverse_iterator<iterator>             reverse_iterator;
1233
    typedef _VSTD::reverse_iterator<const_iterator>       const_reverse_iterator;
1234
1235
private:
1236
1237
#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT
1238
1239
    struct __long
1240
    {
1241
        pointer   __data_;
1242
        size_type __size_;
1243
        size_type __cap_;
1244
    };
1245
1246
#if _LIBCPP_BIG_ENDIAN
1247
    enum {__short_mask = 0x01};
1248
    enum {__long_mask  = 0x1ul};
1249
#else  // _LIBCPP_BIG_ENDIAN
1250
    enum {__short_mask = 0x80};
1251
    enum {__long_mask  = ~(size_type(~0) >> 1)};
1252
#endif  // _LIBCPP_BIG_ENDIAN
1253
1254
    enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
1255
                      (sizeof(__long) - 1)/sizeof(value_type) : 2};
1256
1257
    struct __short
1258
    {
1259
        value_type __data_[__min_cap];
1260
        struct
1261
            : __padding<value_type>
1262
        {
1263
            unsigned char __size_;
1264
        };
1265
    };
1266
1267
#else
1268
1269
    struct __long
1270
    {
1271
        size_type __cap_;
1272
        size_type __size_;
1273
        pointer   __data_;
1274
    };
1275
1276
#if _LIBCPP_BIG_ENDIAN
1277
    enum {__short_mask = 0x80};
1278
    enum {__long_mask  = ~(size_type(~0) >> 1)};
1279
#else  // _LIBCPP_BIG_ENDIAN
1280
    enum {__short_mask = 0x01};
1281
    enum {__long_mask  = 0x1ul};
1282
#endif  // _LIBCPP_BIG_ENDIAN
1283
1284
    enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
1285
                      (sizeof(__long) - 1)/sizeof(value_type) : 2};
1286
1287
    struct __short
1288
    {
1289
        union
1290
        {
1291
            unsigned char __size_;
1292
            value_type __lx;
1293
        };
1294
        value_type __data_[__min_cap];
1295
    };
1296
1297
#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT
1298
1299
    union __ulx{__long __lx; __short __lxx;};
1300
1301
    enum {__n_words = sizeof(__ulx) / sizeof(size_type)};
1302
1303
    struct __raw
1304
    {
1305
        size_type __words[__n_words];
1306
    };
1307
1308
    struct __rep
1309
    {
1310
        union
1311
        {
1312
            __long  __l;
1313
            __short __s;
1314
            __raw   __r;
1315
        };
1316
    };
1317
1318
    __compressed_pair<__rep, allocator_type> __r_;
1319
1320
public:
1321
    static const size_type npos = -1;
1322
1323
    _LIBCPP_INLINE_VISIBILITY basic_string()
1324
        _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
1325
1326
    _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type& __a)
1327
#if _LIBCPP_STD_VER <= 14
1328
        _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value);
1329
#else
1330
        _NOEXCEPT;
1331
#endif
1332
1333
    basic_string(const basic_string& __str);
1334
    basic_string(const basic_string& __str, const allocator_type& __a);
1335
1336
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1337
    _LIBCPP_INLINE_VISIBILITY
1338
    basic_string(basic_string&& __str)
1339
#if _LIBCPP_STD_VER <= 14
1340
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
1341
#else
1342
        _NOEXCEPT;
1343
#endif
1344
1345
    _LIBCPP_INLINE_VISIBILITY
1346
    basic_string(basic_string&& __str, const allocator_type& __a);
1347
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
1348
    _LIBCPP_INLINE_VISIBILITY basic_string(const value_type* __s);
1349
    _LIBCPP_INLINE_VISIBILITY
1350
    basic_string(const value_type* __s, const allocator_type& __a);
1351
    _LIBCPP_INLINE_VISIBILITY
1352
    basic_string(const value_type* __s, size_type __n);
1353
    _LIBCPP_INLINE_VISIBILITY
1354
    basic_string(const value_type* __s, size_type __n, const allocator_type& __a);
1355
    _LIBCPP_INLINE_VISIBILITY
1356
    basic_string(size_type __n, value_type __c);
1357
    _LIBCPP_INLINE_VISIBILITY
1358
    basic_string(size_type __n, value_type __c, const allocator_type& __a);
1359
    basic_string(const basic_string& __str, size_type __pos, size_type __n = npos,
1360
                 const allocator_type& __a = allocator_type());
1361
    template<class _InputIterator>
1362
        _LIBCPP_INLINE_VISIBILITY
1363
        basic_string(_InputIterator __first, _InputIterator __last);
1364
    template<class _InputIterator>
1365
        _LIBCPP_INLINE_VISIBILITY
1366
        basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a);
1367
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1368
    _LIBCPP_INLINE_VISIBILITY
1369
    basic_string(initializer_list<value_type> __il);
1370
    _LIBCPP_INLINE_VISIBILITY
1371
    basic_string(initializer_list<value_type> __il, const allocator_type& __a);
1372
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1373
1374
    ~basic_string();
1375
1376
    basic_string& operator=(const basic_string& __str);
1377
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1378
    _LIBCPP_INLINE_VISIBILITY
1379
    basic_string& operator=(basic_string&& __str)
1380
        _NOEXCEPT_((__noexcept_move_assign_container<_Allocator, __alloc_traits>::value));
1381
#endif
1382
    _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const value_type* __s) {return assign(__s);}
1383
    basic_string& operator=(value_type __c);
1384
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1385
    _LIBCPP_INLINE_VISIBILITY
1386
    basic_string& operator=(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
1387
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1388
1389
#if _LIBCPP_DEBUG_LEVEL >= 2
1390
    _LIBCPP_INLINE_VISIBILITY
1391
    iterator begin() _NOEXCEPT
1392
        {return iterator(this, __get_pointer());}
1393
    _LIBCPP_INLINE_VISIBILITY
1394
    const_iterator begin() const _NOEXCEPT
1395
        {return const_iterator(this, __get_pointer());}
1396
    _LIBCPP_INLINE_VISIBILITY
1397
    iterator end() _NOEXCEPT
1398
        {return iterator(this, __get_pointer() + size());}
1399
    _LIBCPP_INLINE_VISIBILITY
1400
    const_iterator end() const _NOEXCEPT
1401
        {return const_iterator(this, __get_pointer() + size());}
1402
#else
1403
    _LIBCPP_INLINE_VISIBILITY
1404
    iterator begin() _NOEXCEPT
1405
        {return iterator(__get_pointer());}
1406
    _LIBCPP_INLINE_VISIBILITY
1407
    const_iterator begin() const _NOEXCEPT
1408
        {return const_iterator(__get_pointer());}
1409
    _LIBCPP_INLINE_VISIBILITY
1410
    iterator end() _NOEXCEPT
1411
        {return iterator(__get_pointer() + size());}
1412
    _LIBCPP_INLINE_VISIBILITY
1413
    const_iterator end() const _NOEXCEPT
1414
        {return const_iterator(__get_pointer() + size());}
1415
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
1416
    _LIBCPP_INLINE_VISIBILITY
1417
    reverse_iterator rbegin() _NOEXCEPT
1418
        {return reverse_iterator(end());}
1419
    _LIBCPP_INLINE_VISIBILITY
1420
    const_reverse_iterator rbegin() const _NOEXCEPT
1421
        {return const_reverse_iterator(end());}
1422
    _LIBCPP_INLINE_VISIBILITY
1423
    reverse_iterator rend() _NOEXCEPT
1424
        {return reverse_iterator(begin());}
1425
    _LIBCPP_INLINE_VISIBILITY
1426
    const_reverse_iterator rend() const _NOEXCEPT
1427
        {return const_reverse_iterator(begin());}
1428
1429
    _LIBCPP_INLINE_VISIBILITY
1430
    const_iterator cbegin() const _NOEXCEPT
1431
        {return begin();}
1432
    _LIBCPP_INLINE_VISIBILITY
1433
    const_iterator cend() const _NOEXCEPT
1434
        {return end();}
1435
    _LIBCPP_INLINE_VISIBILITY
1436
    const_reverse_iterator crbegin() const _NOEXCEPT
1437
        {return rbegin();}
1438
    _LIBCPP_INLINE_VISIBILITY
1439
    const_reverse_iterator crend() const _NOEXCEPT
1440
        {return rend();}
1441
1442
    _LIBCPP_INLINE_VISIBILITY size_type size() const _NOEXCEPT
1443
        {return __is_long() ? __get_long_size() : __get_short_size();}
1444
    _LIBCPP_INLINE_VISIBILITY size_type length() const _NOEXCEPT {return size();}
1445
    _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT;
1446
    _LIBCPP_INLINE_VISIBILITY size_type capacity() const _NOEXCEPT
1447
        {return (__is_long() ? __get_long_cap() : __min_cap) - 1;}
1448
1449
    void resize(size_type __n, value_type __c);
1450
    _LIBCPP_INLINE_VISIBILITY void resize(size_type __n) {resize(__n, value_type());}
1451
1452
    void reserve(size_type res_arg = 0);
1453
    _LIBCPP_INLINE_VISIBILITY
1454
    void shrink_to_fit() _NOEXCEPT {reserve();}
1455
    _LIBCPP_INLINE_VISIBILITY
1456
    void clear() _NOEXCEPT;
1457
    _LIBCPP_INLINE_VISIBILITY bool empty() const _NOEXCEPT {return size() == 0;}
1458
1459
    _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __pos) const;
1460
    _LIBCPP_INLINE_VISIBILITY reference       operator[](size_type __pos);
1461
1462
    const_reference at(size_type __n) const;
1463
    reference       at(size_type __n);
1464
1465
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const basic_string& __str) {return append(__str);}
1466
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const value_type* __s)         {return append(__s);}
1467
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(value_type __c)            {push_back(__c); return *this;}
1468
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1469
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(initializer_list<value_type> __il) {return append(__il);}
1470
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1471
1472
    _LIBCPP_INLINE_VISIBILITY
1473
    basic_string& append(const basic_string& __str);
1474
    basic_string& append(const basic_string& __str, size_type __pos, size_type __n=npos);
1475
    basic_string& append(const value_type* __s, size_type __n);
1476
    basic_string& append(const value_type* __s);
1477
    basic_string& append(size_type __n, value_type __c);
1478
    template<class _InputIterator>
1479
        typename enable_if
1480
        <
1481
             __is_input_iterator  <_InputIterator>::value &&
1482
            !__is_forward_iterator<_InputIterator>::value,
1483
            basic_string&
1484
        >::type
1485
        append(_InputIterator __first, _InputIterator __last);
1486
    template<class _ForwardIterator>
1487
        typename enable_if
1488
        <
1489
            __is_forward_iterator<_ForwardIterator>::value,
1490
            basic_string&
1491
        >::type
1492
        append(_ForwardIterator __first, _ForwardIterator __last);
1493
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1494
    _LIBCPP_INLINE_VISIBILITY
1495
    basic_string& append(initializer_list<value_type> __il) {return append(__il.begin(), __il.size());}
1496
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1497
1498
    void push_back(value_type __c);
1499
    _LIBCPP_INLINE_VISIBILITY
1500
    void pop_back();
1501
    _LIBCPP_INLINE_VISIBILITY reference       front();
1502
    _LIBCPP_INLINE_VISIBILITY const_reference front() const;
1503
    _LIBCPP_INLINE_VISIBILITY reference       back();
1504
    _LIBCPP_INLINE_VISIBILITY const_reference back() const;
1505
1506
    _LIBCPP_INLINE_VISIBILITY
1507
    basic_string& assign(const basic_string& __str);
1508
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1509
    _LIBCPP_INLINE_VISIBILITY
1510
    basic_string& assign(basic_string&& str)
1511
        {*this = _VSTD::move(str); return *this;}
1512
#endif
1513
    basic_string& assign(const basic_string& __str, size_type __pos, size_type __n=npos);
1514
    basic_string& assign(const value_type* __s, size_type __n);
1515
    basic_string& assign(const value_type* __s);
1516
    basic_string& assign(size_type __n, value_type __c);
1517
    template<class _InputIterator>
1518
        typename enable_if
1519
        <
1520
             __is_input_iterator  <_InputIterator>::value &&
1521
            !__is_forward_iterator<_InputIterator>::value,
1522
            basic_string&
1523
        >::type
1524
        assign(_InputIterator __first, _InputIterator __last);
1525
    template<class _ForwardIterator>
1526
        typename enable_if
1527
        <
1528
            __is_forward_iterator<_ForwardIterator>::value,
1529
            basic_string&
1530
        >::type
1531
        assign(_ForwardIterator __first, _ForwardIterator __last);
1532
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1533
    _LIBCPP_INLINE_VISIBILITY
1534
    basic_string& assign(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
1535
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1536
1537
    _LIBCPP_INLINE_VISIBILITY
1538
    basic_string& insert(size_type __pos1, const basic_string& __str);
1539
    basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n=npos);
1540
    basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
1541
    basic_string& insert(size_type __pos, const value_type* __s);
1542
    basic_string& insert(size_type __pos, size_type __n, value_type __c);
1543
    iterator      insert(const_iterator __pos, value_type __c);
1544
    _LIBCPP_INLINE_VISIBILITY
1545
    iterator      insert(const_iterator __pos, size_type __n, value_type __c);
1546
    template<class _InputIterator>
1547
        typename enable_if
1548
        <
1549
             __is_input_iterator  <_InputIterator>::value &&
1550
            !__is_forward_iterator<_InputIterator>::value,
1551
            iterator
1552
        >::type
1553
        insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
1554
    template<class _ForwardIterator>
1555
        typename enable_if
1556
        <
1557
            __is_forward_iterator<_ForwardIterator>::value,
1558
            iterator
1559
        >::type
1560
        insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
1561
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1562
    _LIBCPP_INLINE_VISIBILITY
1563
    iterator insert(const_iterator __pos, initializer_list<value_type> __il)
1564
                    {return insert(__pos, __il.begin(), __il.end());}
1565
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1566
1567
    basic_string& erase(size_type __pos = 0, size_type __n = npos);
1568
    _LIBCPP_INLINE_VISIBILITY
1569
    iterator      erase(const_iterator __pos);
1570
    _LIBCPP_INLINE_VISIBILITY
1571
    iterator      erase(const_iterator __first, const_iterator __last);
1572
1573
    _LIBCPP_INLINE_VISIBILITY
1574
    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str);
1575
    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2=npos);
1576
    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
1577
    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
1578
    basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c);
1579
    _LIBCPP_INLINE_VISIBILITY
1580
    basic_string& replace(const_iterator __i1, const_iterator __i2, const basic_string& __str);
1581
    _LIBCPP_INLINE_VISIBILITY
1582
    basic_string& replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n);
1583
    _LIBCPP_INLINE_VISIBILITY
1584
    basic_string& replace(const_iterator __i1, const_iterator __i2, const value_type* __s);
1585
    _LIBCPP_INLINE_VISIBILITY
1586
    basic_string& replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c);
1587
    template<class _InputIterator>
1588
        typename enable_if
1589
        <
1590
            __is_input_iterator<_InputIterator>::value,
1591
            basic_string&
1592
        >::type
1593
        replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
1594
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1595
    _LIBCPP_INLINE_VISIBILITY
1596
    basic_string& replace(const_iterator __i1, const_iterator __i2, initializer_list<value_type> __il)
1597
        {return replace(__i1, __i2, __il.begin(), __il.end());}
1598
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
1599
1600
    size_type copy(value_type* __s, size_type __n, size_type __pos = 0) const;
1601
    _LIBCPP_INLINE_VISIBILITY
1602
    basic_string substr(size_type __pos = 0, size_type __n = npos) const;
1603
1604
    _LIBCPP_INLINE_VISIBILITY
1605
    void swap(basic_string& __str)
1606
#if _LIBCPP_STD_VER >= 14
1607
        _NOEXCEPT;
1608
#else
1609
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
1610
                    __is_nothrow_swappable<allocator_type>::value);
1611
#endif
1612
1613
    _LIBCPP_INLINE_VISIBILITY
1614
    const value_type* c_str() const _NOEXCEPT {return data();}
1615
    _LIBCPP_INLINE_VISIBILITY
1616
    const value_type* data() const _NOEXCEPT  {return _VSTD::__to_raw_pointer(__get_pointer());}
1617
1618
    _LIBCPP_INLINE_VISIBILITY
1619
    allocator_type get_allocator() const _NOEXCEPT {return __alloc();}
1620
1621
    _LIBCPP_INLINE_VISIBILITY
1622
    size_type find(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
1623
    size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1624
    _LIBCPP_INLINE_VISIBILITY
1625
    size_type find(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
1626
    size_type find(value_type __c, size_type __pos = 0) const _NOEXCEPT;
1627
1628
    _LIBCPP_INLINE_VISIBILITY
1629
    size_type rfind(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
1630
    size_type rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1631
    _LIBCPP_INLINE_VISIBILITY
1632
    size_type rfind(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
1633
    size_type rfind(value_type __c, size_type __pos = npos) const _NOEXCEPT;
1634
1635
    _LIBCPP_INLINE_VISIBILITY
1636
    size_type find_first_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
1637
    size_type find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1638
    _LIBCPP_INLINE_VISIBILITY
1639
    size_type find_first_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
1640
    _LIBCPP_INLINE_VISIBILITY
1641
    size_type find_first_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;
1642
1643
    _LIBCPP_INLINE_VISIBILITY
1644
    size_type find_last_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
1645
    size_type find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1646
    _LIBCPP_INLINE_VISIBILITY
1647
    size_type find_last_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
1648
    _LIBCPP_INLINE_VISIBILITY
1649
    size_type find_last_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;
1650
1651
    _LIBCPP_INLINE_VISIBILITY
1652
    size_type find_first_not_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
1653
    size_type find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1654
    _LIBCPP_INLINE_VISIBILITY
1655
    size_type find_first_not_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
1656
    _LIBCPP_INLINE_VISIBILITY
1657
    size_type find_first_not_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;
1658
1659
    _LIBCPP_INLINE_VISIBILITY
1660
    size_type find_last_not_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
1661
    size_type find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
1662
    _LIBCPP_INLINE_VISIBILITY
1663
    size_type find_last_not_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
1664
    _LIBCPP_INLINE_VISIBILITY
1665
    size_type find_last_not_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;
1666
1667
    _LIBCPP_INLINE_VISIBILITY
1668
    int compare(const basic_string& __str) const _NOEXCEPT;
1669
    _LIBCPP_INLINE_VISIBILITY
1670
    int compare(size_type __pos1, size_type __n1, const basic_string& __str) const;
1671
    int compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2=npos) const;
1672
    int compare(const value_type* __s) const _NOEXCEPT;
1673
    int compare(size_type __pos1, size_type __n1, const value_type* __s) const;
1674
    int compare(size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const;
1675
1676
    _LIBCPP_INLINE_VISIBILITY bool __invariants() const;
1677
1678
    _LIBCPP_INLINE_VISIBILITY
1679
    bool __is_long() const _NOEXCEPT
1680
        {return bool(__r_.first().__s.__size_ & __short_mask);}
1681
1682
#if _LIBCPP_DEBUG_LEVEL >= 2
1683
1684
    bool __dereferenceable(const const_iterator* __i) const;
1685
    bool __decrementable(const const_iterator* __i) const;
1686
    bool __addable(const const_iterator* __i, ptrdiff_t __n) const;
1687
    bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const;
1688
1689
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
1690
1691
private:
1692
    _LIBCPP_INLINE_VISIBILITY
1693
    allocator_type& __alloc() _NOEXCEPT
1694
        {return __r_.second();}
1695
    _LIBCPP_INLINE_VISIBILITY
1696
    const allocator_type& __alloc() const _NOEXCEPT
1697
        {return __r_.second();}
1698
1699
#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT
1700
1701
    _LIBCPP_INLINE_VISIBILITY
1702
    void __set_short_size(size_type __s) _NOEXCEPT
1703
#   if _LIBCPP_BIG_ENDIAN
1704
        {__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
1705
#   else
1706
        {__r_.first().__s.__size_ = (unsigned char)(__s);}
1707
#   endif
1708
1709
    _LIBCPP_INLINE_VISIBILITY
1710
    size_type __get_short_size() const _NOEXCEPT
1711
#   if _LIBCPP_BIG_ENDIAN
1712
        {return __r_.first().__s.__size_ >> 1;}
1713
#   else
1714
        {return __r_.first().__s.__size_;}
1715
#   endif
1716
1717
#else  // _LIBCPP_ALTERNATE_STRING_LAYOUT
1718
1719
    _LIBCPP_INLINE_VISIBILITY
1720
    void __set_short_size(size_type __s) _NOEXCEPT
1721
#   if _LIBCPP_BIG_ENDIAN
1722
        {__r_.first().__s.__size_ = (unsigned char)(__s);}
1723
#   else
1724
        {__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
1725
#   endif
1726
1727
    _LIBCPP_INLINE_VISIBILITY
1728
    size_type __get_short_size() const _NOEXCEPT
1729
#   if _LIBCPP_BIG_ENDIAN
1730
        {return __r_.first().__s.__size_;}
1731
#   else
1732
        {return __r_.first().__s.__size_ >> 1;}
1733
#   endif
1734
1735
#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT
1736
1737
    _LIBCPP_INLINE_VISIBILITY
1738
    void __set_long_size(size_type __s) _NOEXCEPT
1739
        {__r_.first().__l.__size_ = __s;}
1740
    _LIBCPP_INLINE_VISIBILITY
1741
    size_type __get_long_size() const _NOEXCEPT
1742
        {return __r_.first().__l.__size_;}
1743
    _LIBCPP_INLINE_VISIBILITY
1744
    void __set_size(size_type __s) _NOEXCEPT
1745
        {if (__is_long()) __set_long_size(__s); else __set_short_size(__s);}
1746
1747
    _LIBCPP_INLINE_VISIBILITY
1748
    void __set_long_cap(size_type __s) _NOEXCEPT
1749
        {__r_.first().__l.__cap_  = __long_mask | __s;}
1750
    _LIBCPP_INLINE_VISIBILITY
1751
    size_type __get_long_cap() const _NOEXCEPT
1752
        {return __r_.first().__l.__cap_ & size_type(~__long_mask);}
1753
1754
    _LIBCPP_INLINE_VISIBILITY
1755
    void __set_long_pointer(pointer __p) _NOEXCEPT
1756
        {__r_.first().__l.__data_ = __p;}
1757
    _LIBCPP_INLINE_VISIBILITY
1758
    pointer __get_long_pointer() _NOEXCEPT
1759
        {return __r_.first().__l.__data_;}
1760
    _LIBCPP_INLINE_VISIBILITY
1761
    const_pointer __get_long_pointer() const _NOEXCEPT
1762
        {return __r_.first().__l.__data_;}
1763
    _LIBCPP_INLINE_VISIBILITY
1764
    pointer __get_short_pointer() _NOEXCEPT
1765
        {return pointer_traits<pointer>::pointer_to(__r_.first().__s.__data_[0]);}
1766
    _LIBCPP_INLINE_VISIBILITY
1767
    const_pointer __get_short_pointer() const _NOEXCEPT
1768
        {return pointer_traits<const_pointer>::pointer_to(__r_.first().__s.__data_[0]);}
1769
    _LIBCPP_INLINE_VISIBILITY
1770
    pointer __get_pointer() _NOEXCEPT
1771
        {return __is_long() ? __get_long_pointer() : __get_short_pointer();}
1772
    _LIBCPP_INLINE_VISIBILITY
1773
    const_pointer __get_pointer() const _NOEXCEPT
1774
        {return __is_long() ? __get_long_pointer() : __get_short_pointer();}
1775
1776
    _LIBCPP_INLINE_VISIBILITY
1777
    void __zero() _NOEXCEPT
1778
        {
1779
            size_type (&__a)[__n_words] = __r_.first().__r.__words;
1780
            for (unsigned __i = 0; __i < __n_words; ++__i)
1781
                __a[__i] = 0;
1782
        }
1783
1784
    template <size_type __a> static
1785
        _LIBCPP_INLINE_VISIBILITY
1786
        size_type __align_it(size_type __s) _NOEXCEPT
1787
            {return __s + (__a-1) & ~(__a-1);}
1788
    enum {__alignment = 16};
1789
    static _LIBCPP_INLINE_VISIBILITY
1790
    size_type __recommend(size_type __s) _NOEXCEPT
1791
        {return (__s < __min_cap ? __min_cap :
1792
                 __align_it<sizeof(value_type) < __alignment ?
1793
                            __alignment/sizeof(value_type) : 1 > (__s+1)) - 1;}
1794
1795
    void __init(const value_type* __s, size_type __sz, size_type __reserve);
1796
    void __init(const value_type* __s, size_type __sz);
1797
    void __init(size_type __n, value_type __c);
1798
1799
    template <class _InputIterator>
1800
    typename enable_if
1801
    <
1802
         __is_input_iterator  <_InputIterator>::value &&
1803
        !__is_forward_iterator<_InputIterator>::value,
1804
        void
1805
    >::type
1806
    __init(_InputIterator __first, _InputIterator __last);
1807
1808
    template <class _ForwardIterator>
1809
    typename enable_if
1810
    <
1811
        __is_forward_iterator<_ForwardIterator>::value,
1812
        void
1813
    >::type
1814
    __init(_ForwardIterator __first, _ForwardIterator __last);
1815
1816
    void __grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
1817
                   size_type __n_copy,  size_type __n_del,     size_type __n_add = 0);
1818
    void __grow_by_and_replace(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
1819
                               size_type __n_copy,  size_type __n_del,
1820
                               size_type __n_add, const value_type* __p_new_stuff);
1821
1822
    _LIBCPP_INLINE_VISIBILITY
1823
    void __erase_to_end(size_type __pos);
1824
1825
    _LIBCPP_INLINE_VISIBILITY
1826
    void __copy_assign_alloc(const basic_string& __str)
1827
        {__copy_assign_alloc(__str, integral_constant<bool,
1828
                      __alloc_traits::propagate_on_container_copy_assignment::value>());}
1829
1830
    _LIBCPP_INLINE_VISIBILITY
1831
    void __copy_assign_alloc(const basic_string& __str, true_type)
1832
        {
1833
            if (__alloc() != __str.__alloc())
1834
            {
1835
                clear();
1836
                shrink_to_fit();
1837
            }
1838
            __alloc() = __str.__alloc();
1839
        }
1840
1841
    _LIBCPP_INLINE_VISIBILITY
1842
    void __copy_assign_alloc(const basic_string&, false_type) _NOEXCEPT
1843
        {}
1844
1845
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
1846
    _LIBCPP_INLINE_VISIBILITY
1847
    void __move_assign(basic_string& __str, false_type)
1848
        _NOEXCEPT_(__alloc_traits::is_always_equal::value);
1849
    _LIBCPP_INLINE_VISIBILITY
1850
    void __move_assign(basic_string& __str, true_type)
1851
#if _LIBCPP_STD_VER > 14
1852
        _NOEXCEPT;
1853
#else
1854
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
1855
#endif
1856
#endif
1857
1858
    _LIBCPP_INLINE_VISIBILITY
1859
    void
1860
    __move_assign_alloc(basic_string& __str)
1861
        _NOEXCEPT_(
1862
            !__alloc_traits::propagate_on_container_move_assignment::value ||
1863
            is_nothrow_move_assignable<allocator_type>::value)
1864
    {__move_assign_alloc(__str, integral_constant<bool,
1865
                      __alloc_traits::propagate_on_container_move_assignment::value>());}
1866
1867
    _LIBCPP_INLINE_VISIBILITY
1868
    void __move_assign_alloc(basic_string& __c, true_type)
1869
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
1870
        {
1871
            __alloc() = _VSTD::move(__c.__alloc());
1872
        }
1873
1874
    _LIBCPP_INLINE_VISIBILITY
1875
    void __move_assign_alloc(basic_string&, false_type)
1876
        _NOEXCEPT
1877
        {}
1878
1879
    _LIBCPP_INLINE_VISIBILITY void __invalidate_all_iterators();
1880
    _LIBCPP_INLINE_VISIBILITY void __invalidate_iterators_past(size_type);
1881
1882
    friend basic_string operator+<>(const basic_string&, const basic_string&);
1883
    friend basic_string operator+<>(const value_type*, const basic_string&);
1884
    friend basic_string operator+<>(value_type, const basic_string&);
1885
    friend basic_string operator+<>(const basic_string&, const value_type*);
1886
    friend basic_string operator+<>(const basic_string&, value_type);
1887
};
1888
1889
template <class _CharT, class _Traits, class _Allocator>
1890
inline _LIBCPP_INLINE_VISIBILITY
1891
void
1892
basic_string<_CharT, _Traits, _Allocator>::__invalidate_all_iterators()
1893
{
1894
#if _LIBCPP_DEBUG_LEVEL >= 2
1895
    __get_db()->__invalidate_all(this);
1896
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
1897
}
1898
1899
template <class _CharT, class _Traits, class _Allocator>
1900
inline _LIBCPP_INLINE_VISIBILITY
1901
void
1902
basic_string<_CharT, _Traits, _Allocator>::__invalidate_iterators_past(size_type
1903
#if _LIBCPP_DEBUG_LEVEL >= 2
1904
                                                                        __pos
1905
#endif
1906
                                                                      )
1907
{
1908
#if _LIBCPP_DEBUG_LEVEL >= 2
1909
    __c_node* __c = __get_db()->__find_c_and_lock(this);
1910
    if (__c)
1911
    {
1912
        const_pointer __new_last = __get_pointer() + __pos;
1913
        for (__i_node** __p = __c->end_; __p != __c->beg_; )
1914
        {
1915
            --__p;
1916
            const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
1917
            if (__i->base() > __new_last)
1918
            {
1919
                (*__p)->__c_ = nullptr;
1920
                if (--__c->end_ != __p)
1921
                    memmove(__p, __p+1, (__c->end_ - __p)*sizeof(__i_node*));
1922
            }
1923
        }
1924
        __get_db()->unlock();
1925
    }
1926
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
1927
}
1928
1929
template <class _CharT, class _Traits, class _Allocator>
1930
inline _LIBCPP_INLINE_VISIBILITY
1931
basic_string<_CharT, _Traits, _Allocator>::basic_string()
1932
    _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
1933
{
1934
#if _LIBCPP_DEBUG_LEVEL >= 2
1935
    __get_db()->__insert_c(this);
1936
#endif
1937
    __zero();
1938
}
1939
1940
template <class _CharT, class _Traits, class _Allocator>
1941
inline _LIBCPP_INLINE_VISIBILITY
1942
basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a)
1943
#if _LIBCPP_STD_VER <= 14
1944
        _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value)
1945
#else
1946
        _NOEXCEPT
1947
#endif
1948
: __r_(__a)
1949
{
1950
#if _LIBCPP_DEBUG_LEVEL >= 2
1951
    __get_db()->__insert_c(this);
1952
#endif
1953
    __zero();
1954
}
1955
1956
template <class _CharT, class _Traits, class _Allocator>
1957
void
1958
basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz, size_type __reserve)
1959
{
1960
    if (__reserve > max_size())
1961
        this->__throw_length_error();
1962
    pointer __p;
1963
    if (__reserve < __min_cap)
1964
    {
1965
        __set_short_size(__sz);
1966
        __p = __get_short_pointer();
1967
    }
1968
    else
1969
    {
1970
        size_type __cap = __recommend(__reserve);
1971
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
1972
        __set_long_pointer(__p);
1973
        __set_long_cap(__cap+1);
1974
        __set_long_size(__sz);
1975
    }
1976
    traits_type::copy(_VSTD::__to_raw_pointer(__p), __s, __sz);
1977
    traits_type::assign(__p[__sz], value_type());
1978
}
1979
1980
template <class _CharT, class _Traits, class _Allocator>
1981
void
1982
basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz)
1983
{
1984
    if (__sz > max_size())
1985
        this->__throw_length_error();
1986
    pointer __p;
1987
    if (__sz < __min_cap)
1988
    {
1989
        __set_short_size(__sz);
1990
        __p = __get_short_pointer();
1991
    }
1992
    else
1993
    {
1994
        size_type __cap = __recommend(__sz);
1995
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
1996
        __set_long_pointer(__p);
1997
        __set_long_cap(__cap+1);
1998
        __set_long_size(__sz);
1999
    }
2000
    traits_type::copy(_VSTD::__to_raw_pointer(__p), __s, __sz);
2001
    traits_type::assign(__p[__sz], value_type());
2002
}
2003
2004
template <class _CharT, class _Traits, class _Allocator>
2005
inline _LIBCPP_INLINE_VISIBILITY
2006
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s)
2007
{
2008
    _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*) detected nullptr");
2009
    __init(__s, traits_type::length(__s));
2010
#if _LIBCPP_DEBUG_LEVEL >= 2
2011
    __get_db()->__insert_c(this);
2012
#endif
2013
}
2014
2015
template <class _CharT, class _Traits, class _Allocator>
2016
inline _LIBCPP_INLINE_VISIBILITY
2017
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, const allocator_type& __a)
2018
    : __r_(__a)
2019
{
2020
    _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*, allocator) detected nullptr");
2021
    __init(__s, traits_type::length(__s));
2022
#if _LIBCPP_DEBUG_LEVEL >= 2
2023
    __get_db()->__insert_c(this);
2024
#endif
2025
}
2026
2027
template <class _CharT, class _Traits, class _Allocator>
2028
inline _LIBCPP_INLINE_VISIBILITY
2029
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, size_type __n)
2030
{
2031
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "basic_string(const char*, n) detected nullptr");
2032
    __init(__s, __n);
2033
#if _LIBCPP_DEBUG_LEVEL >= 2
2034
    __get_db()->__insert_c(this);
2035
#endif
2036
}
2037
2038
template <class _CharT, class _Traits, class _Allocator>
2039
inline _LIBCPP_INLINE_VISIBILITY
2040
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, size_type __n, const allocator_type& __a)
2041
    : __r_(__a)
2042
{
2043
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "basic_string(const char*, n, allocator) detected nullptr");
2044
    __init(__s, __n);
2045
#if _LIBCPP_DEBUG_LEVEL >= 2
2046
    __get_db()->__insert_c(this);
2047
#endif
2048
}
2049
2050
template <class _CharT, class _Traits, class _Allocator>
2051
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str)
2052
    : __r_(__alloc_traits::select_on_container_copy_construction(__str.__alloc()))
2053
{
2054
    if (!__str.__is_long())
2055
        __r_.first().__r = __str.__r_.first().__r;
2056
    else
2057
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
2058
#if _LIBCPP_DEBUG_LEVEL >= 2
2059
    __get_db()->__insert_c(this);
2060
#endif
2061
}
2062
2063
template <class _CharT, class _Traits, class _Allocator>
2064
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str, const allocator_type& __a)
2065
    : __r_(__a)
2066
{
2067
    if (!__str.__is_long())
2068
        __r_.first().__r = __str.__r_.first().__r;
2069
    else
2070
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
2071
#if _LIBCPP_DEBUG_LEVEL >= 2
2072
    __get_db()->__insert_c(this);
2073
#endif
2074
}
2075
2076
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
2077
2078
template <class _CharT, class _Traits, class _Allocator>
2079
inline _LIBCPP_INLINE_VISIBILITY
2080
basic_string<_CharT, _Traits, _Allocator>::basic_string(basic_string&& __str)
2081
#if _LIBCPP_STD_VER <= 14
2082
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
2083
#else
2084
        _NOEXCEPT
2085
#endif
2086
    : __r_(_VSTD::move(__str.__r_))
2087
{
2088
    __str.__zero();
2089
#if _LIBCPP_DEBUG_LEVEL >= 2
2090
    __get_db()->__insert_c(this);
2091
    if (__is_long())
2092
        __get_db()->swap(this, &__str);
2093
#endif
2094
}
2095
2096
template <class _CharT, class _Traits, class _Allocator>
2097
inline _LIBCPP_INLINE_VISIBILITY
2098
basic_string<_CharT, _Traits, _Allocator>::basic_string(basic_string&& __str, const allocator_type& __a)
2099
    : __r_(__a)
2100
{
2101
    if (__str.__is_long() && __a != __str.__alloc()) // copy, not move
2102
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
2103
    else
2104
    {
2105
        __r_.first().__r = __str.__r_.first().__r;
2106
        __str.__zero();
2107
    }
2108
#if _LIBCPP_DEBUG_LEVEL >= 2
2109
    __get_db()->__insert_c(this);
2110
    if (__is_long())
2111
        __get_db()->swap(this, &__str);
2112
#endif
2113
}
2114
2115
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
2116
2117
template <class _CharT, class _Traits, class _Allocator>
2118
void
2119
basic_string<_CharT, _Traits, _Allocator>::__init(size_type __n, value_type __c)
2120
{
2121
    if (__n > max_size())
2122
        this->__throw_length_error();
2123
    pointer __p;
2124
    if (__n < __min_cap)
2125
    {
2126
        __set_short_size(__n);
2127
        __p = __get_short_pointer();
2128
    }
2129
    else
2130
    {
2131
        size_type __cap = __recommend(__n);
2132
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
2133
        __set_long_pointer(__p);
2134
        __set_long_cap(__cap+1);
2135
        __set_long_size(__n);
2136
    }
2137
    traits_type::assign(_VSTD::__to_raw_pointer(__p), __n, __c);
2138
    traits_type::assign(__p[__n], value_type());
2139
}
2140
2141
template <class _CharT, class _Traits, class _Allocator>
2142
inline _LIBCPP_INLINE_VISIBILITY
2143
basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, value_type __c)
2144
{
2145
    __init(__n, __c);
2146
#if _LIBCPP_DEBUG_LEVEL >= 2
2147
    __get_db()->__insert_c(this);
2148
#endif
2149
}
2150
2151
template <class _CharT, class _Traits, class _Allocator>
2152
inline _LIBCPP_INLINE_VISIBILITY
2153
basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, value_type __c, const allocator_type& __a)
2154
    : __r_(__a)
2155
{
2156
    __init(__n, __c);
2157
#if _LIBCPP_DEBUG_LEVEL >= 2
2158
    __get_db()->__insert_c(this);
2159
#endif
2160
}
2161
2162
template <class _CharT, class _Traits, class _Allocator>
2163
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str, size_type __pos, size_type __n,
2164
                                                        const allocator_type& __a)
2165
    : __r_(__a)
2166
{
2167
    size_type __str_sz = __str.size();
2168
    if (__pos > __str_sz)
2169
        this->__throw_out_of_range();
2170
    __init(__str.data() + __pos, _VSTD::min(__n, __str_sz - __pos));
2171
#if _LIBCPP_DEBUG_LEVEL >= 2
2172
    __get_db()->__insert_c(this);
2173
#endif
2174
}
2175
2176
template <class _CharT, class _Traits, class _Allocator>
2177
template <class _InputIterator>
2178
typename enable_if
2179
<
2180
     __is_input_iterator  <_InputIterator>::value &&
2181
    !__is_forward_iterator<_InputIterator>::value,
2182
    void
2183
>::type
2184
basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last)
2185
{
2186
    __zero();
2187
#ifndef _LIBCPP_NO_EXCEPTIONS
2188
    try
2189
    {
2190
#endif  // _LIBCPP_NO_EXCEPTIONS
2191
    for (; __first != __last; ++__first)
2192
        push_back(*__first);
2193
#ifndef _LIBCPP_NO_EXCEPTIONS
2194
    }
2195
    catch (...)
2196
    {
2197
        if (__is_long())
2198
            __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
2199
        throw;
2200
    }
2201
#endif  // _LIBCPP_NO_EXCEPTIONS
2202
}
2203
2204
template <class _CharT, class _Traits, class _Allocator>
2205
template <class _ForwardIterator>
2206
typename enable_if
2207
<
2208
    __is_forward_iterator<_ForwardIterator>::value,
2209
    void
2210
>::type
2211
basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last)
2212
{
2213
    size_type __sz = static_cast<size_type>(_VSTD::distance(__first, __last));
2214
    if (__sz > max_size())
2215
        this->__throw_length_error();
2216
    pointer __p;
2217
    if (__sz < __min_cap)
2218
    {
2219
        __set_short_size(__sz);
2220
        __p = __get_short_pointer();
2221
    }
2222
    else
2223
    {
2224
        size_type __cap = __recommend(__sz);
2225
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
2226
        __set_long_pointer(__p);
2227
        __set_long_cap(__cap+1);
2228
        __set_long_size(__sz);
2229
    }
2230
    for (; __first != __last; ++__first, (void) ++__p)
2231
        traits_type::assign(*__p, *__first);
2232
    traits_type::assign(*__p, value_type());
2233
}
2234
2235
template <class _CharT, class _Traits, class _Allocator>
2236
template<class _InputIterator>
2237
inline _LIBCPP_INLINE_VISIBILITY
2238
basic_string<_CharT, _Traits, _Allocator>::basic_string(_InputIterator __first, _InputIterator __last)
2239
{
2240
    __init(__first, __last);
2241
#if _LIBCPP_DEBUG_LEVEL >= 2
2242
    __get_db()->__insert_c(this);
2243
#endif
2244
}
2245
2246
template <class _CharT, class _Traits, class _Allocator>
2247
template<class _InputIterator>
2248
inline _LIBCPP_INLINE_VISIBILITY
2249
basic_string<_CharT, _Traits, _Allocator>::basic_string(_InputIterator __first, _InputIterator __last,
2250
                                                        const allocator_type& __a)
2251
    : __r_(__a)
2252
{
2253
    __init(__first, __last);
2254
#if _LIBCPP_DEBUG_LEVEL >= 2
2255
    __get_db()->__insert_c(this);
2256
#endif
2257
}
2258
2259
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
2260
2261
template <class _CharT, class _Traits, class _Allocator>
2262
inline _LIBCPP_INLINE_VISIBILITY
2263
basic_string<_CharT, _Traits, _Allocator>::basic_string(initializer_list<value_type> __il)
2264
{
2265
    __init(__il.begin(), __il.end());
2266
#if _LIBCPP_DEBUG_LEVEL >= 2
2267
    __get_db()->__insert_c(this);
2268
#endif
2269
}
2270
2271
template <class _CharT, class _Traits, class _Allocator>
2272
inline _LIBCPP_INLINE_VISIBILITY
2273
basic_string<_CharT, _Traits, _Allocator>::basic_string(initializer_list<value_type> __il, const allocator_type& __a)
2274
    : __r_(__a)
2275
{
2276
    __init(__il.begin(), __il.end());
2277
#if _LIBCPP_DEBUG_LEVEL >= 2
2278
    __get_db()->__insert_c(this);
2279
#endif
2280
}
2281
2282
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
2283
2284
template <class _CharT, class _Traits, class _Allocator>
2285
basic_string<_CharT, _Traits, _Allocator>::~basic_string()
2286
{
2287
#if _LIBCPP_DEBUG_LEVEL >= 2
2288
    __get_db()->__erase_c(this);
2289
#endif
2290
    if (__is_long())
2291
        __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
2292
}
2293
2294
template <class _CharT, class _Traits, class _Allocator>
2295
void
2296
basic_string<_CharT, _Traits, _Allocator>::__grow_by_and_replace
2297
    (size_type __old_cap, size_type __delta_cap, size_type __old_sz,
2298
     size_type __n_copy,  size_type __n_del,     size_type __n_add, const value_type* __p_new_stuff)
2299
{
2300
    size_type __ms = max_size();
2301
    if (__delta_cap > __ms - __old_cap - 1)
2302
        this->__throw_length_error();
2303
    pointer __old_p = __get_pointer();
2304
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
2305
                          __recommend(_VSTD::max(__old_cap + __delta_cap, 2 * __old_cap)) :
2306
                          __ms - 1;
2307
    pointer __p = __alloc_traits::allocate(__alloc(), __cap+1);
2308
    __invalidate_all_iterators();
2309
    if (__n_copy != 0)
2310
        traits_type::copy(_VSTD::__to_raw_pointer(__p),
2311
                          _VSTD::__to_raw_pointer(__old_p), __n_copy);
2312
    if (__n_add != 0)
2313
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy, __p_new_stuff, __n_add);
2314
    size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
2315
    if (__sec_cp_sz != 0)
2316
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy + __n_add,
2317
                          _VSTD::__to_raw_pointer(__old_p) + __n_copy + __n_del, __sec_cp_sz);
2318
    if (__old_cap+1 != __min_cap)
2319
        __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
2320
    __set_long_pointer(__p);
2321
    __set_long_cap(__cap+1);
2322
    __old_sz = __n_copy + __n_add + __sec_cp_sz;
2323
    __set_long_size(__old_sz);
2324
    traits_type::assign(__p[__old_sz], value_type());
2325
}
2326
2327
template <class _CharT, class _Traits, class _Allocator>
2328
void
2329
basic_string<_CharT, _Traits, _Allocator>::__grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
2330
                                                     size_type __n_copy,  size_type __n_del,     size_type __n_add)
2331
{
2332
    size_type __ms = max_size();
2333
    if (__delta_cap > __ms - __old_cap)
2334
        this->__throw_length_error();
2335
    pointer __old_p = __get_pointer();
2336
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
2337
                          __recommend(_VSTD::max(__old_cap + __delta_cap, 2 * __old_cap)) :
2338
                          __ms - 1;
2339
    pointer __p = __alloc_traits::allocate(__alloc(), __cap+1);
2340
    __invalidate_all_iterators();
2341
    if (__n_copy != 0)
2342
        traits_type::copy(_VSTD::__to_raw_pointer(__p),
2343
                          _VSTD::__to_raw_pointer(__old_p), __n_copy);
2344
    size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
2345
    if (__sec_cp_sz != 0)
2346
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy + __n_add,
2347
                          _VSTD::__to_raw_pointer(__old_p) + __n_copy + __n_del,
2348
                          __sec_cp_sz);
2349
    if (__old_cap+1 != __min_cap)
2350
        __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
2351
    __set_long_pointer(__p);
2352
    __set_long_cap(__cap+1);
2353
}
2354
2355
// assign
2356
2357
template <class _CharT, class _Traits, class _Allocator>
2358
basic_string<_CharT, _Traits, _Allocator>&
2359
basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s, size_type __n)
2360
{
2361
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::assign received nullptr");
2362
    size_type __cap = capacity();
2363
    if (__cap >= __n)
2364
    {
2365
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
2366
        traits_type::move(__p, __s, __n);
2367
        traits_type::assign(__p[__n], value_type());
2368
        __set_size(__n);
2369
        __invalidate_iterators_past(__n);
2370
    }
2371
    else
2372
    {
2373
        size_type __sz = size();
2374
        __grow_by_and_replace(__cap, __n - __cap, __sz, 0, __sz, __n, __s);
2375
    }
2376
    return *this;
2377
}
2378
2379
template <class _CharT, class _Traits, class _Allocator>
2380
basic_string<_CharT, _Traits, _Allocator>&
2381
basic_string<_CharT, _Traits, _Allocator>::assign(size_type __n, value_type __c)
2382
{
2383
    size_type __cap = capacity();
2384
    if (__cap < __n)
2385
    {
2386
        size_type __sz = size();
2387
        __grow_by(__cap, __n - __cap, __sz, 0, __sz);
2388
    }
2389
    else
2390
        __invalidate_iterators_past(__n);
2391
    value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
2392
    traits_type::assign(__p, __n, __c);
2393
    traits_type::assign(__p[__n], value_type());
2394
    __set_size(__n);
2395
    return *this;
2396
}
2397
2398
template <class _CharT, class _Traits, class _Allocator>
2399
basic_string<_CharT, _Traits, _Allocator>&
2400
basic_string<_CharT, _Traits, _Allocator>::operator=(value_type __c)
2401
{
2402
    pointer __p;
2403
    if (__is_long())
2404
    {
2405
        __p = __get_long_pointer();
2406
        __set_long_size(1);
2407
    }
2408
    else
2409
    {
2410
        __p = __get_short_pointer();
2411
        __set_short_size(1);
2412
    }
2413
    traits_type::assign(*__p, __c);
2414
    traits_type::assign(*++__p, value_type());
2415
    __invalidate_iterators_past(1);
2416
    return *this;
2417
}
2418
2419
template <class _CharT, class _Traits, class _Allocator>
2420
basic_string<_CharT, _Traits, _Allocator>&
2421
basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str)
2422
{
2423
    if (this != &__str)
2424
    {
2425
        __copy_assign_alloc(__str);
2426
        assign(__str);
2427
    }
2428
    return *this;
2429
}
2430
2431
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
2432
2433
template <class _CharT, class _Traits, class _Allocator>
2434
inline _LIBCPP_INLINE_VISIBILITY
2435
void
2436
basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, false_type)
2437
    _NOEXCEPT_(__alloc_traits::is_always_equal::value)
2438
{
2439
    if (__alloc() != __str.__alloc())
2440
        assign(__str);
2441
    else
2442
        __move_assign(__str, true_type());
2443
}
2444
2445
template <class _CharT, class _Traits, class _Allocator>
2446
inline _LIBCPP_INLINE_VISIBILITY
2447
void
2448
basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, true_type)
2449
#if _LIBCPP_STD_VER > 14
2450
    _NOEXCEPT
2451
#else
2452
    _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
2453
#endif
2454
{
2455
    clear();
2456
    shrink_to_fit();
2457
    __r_.first() = __str.__r_.first();
2458
    __move_assign_alloc(__str);
2459
    __str.__zero();
2460
}
2461
2462
template <class _CharT, class _Traits, class _Allocator>
2463
inline _LIBCPP_INLINE_VISIBILITY
2464
basic_string<_CharT, _Traits, _Allocator>&
2465
basic_string<_CharT, _Traits, _Allocator>::operator=(basic_string&& __str)
2466
    _NOEXCEPT_((__noexcept_move_assign_container<_Allocator, __alloc_traits>::value))
2467
{
2468
    __move_assign(__str, integral_constant<bool,
2469
          __alloc_traits::propagate_on_container_move_assignment::value>());
2470
    return *this;
2471
}
2472
2473
#endif
2474
2475
template <class _CharT, class _Traits, class _Allocator>
2476
template<class _InputIterator>
2477
typename enable_if
2478
<
2479
     __is_input_iterator  <_InputIterator>::value &&
2480
    !__is_forward_iterator<_InputIterator>::value,
2481
    basic_string<_CharT, _Traits, _Allocator>&
2482
>::type
2483
basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
2484
{
2485
    clear();
2486
    for (; __first != __last; ++__first)
2487
        push_back(*__first);
2488
    return *this;
2489
}
2490
2491
template <class _CharT, class _Traits, class _Allocator>
2492
template<class _ForwardIterator>
2493
typename enable_if
2494
<
2495
    __is_forward_iterator<_ForwardIterator>::value,
2496
    basic_string<_CharT, _Traits, _Allocator>&
2497
>::type
2498
basic_string<_CharT, _Traits, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
2499
{
2500
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
2501
    size_type __cap = capacity();
2502
    if (__cap < __n)
2503
    {
2504
        size_type __sz = size();
2505
        __grow_by(__cap, __n - __cap, __sz, 0, __sz);
2506
    }
2507
    else
2508
        __invalidate_iterators_past(__n);
2509
    pointer __p = __get_pointer();
2510
    for (; __first != __last; ++__first, ++__p)
2511
        traits_type::assign(*__p, *__first);
2512
    traits_type::assign(*__p, value_type());
2513
    __set_size(__n);
2514
    return *this;
2515
}
2516
2517
template <class _CharT, class _Traits, class _Allocator>
2518
inline _LIBCPP_INLINE_VISIBILITY
2519
basic_string<_CharT, _Traits, _Allocator>&
2520
basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str)
2521
{
2522
    return assign(__str.data(), __str.size());
2523
}
2524
2525
template <class _CharT, class _Traits, class _Allocator>
2526
basic_string<_CharT, _Traits, _Allocator>&
2527
basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str, size_type __pos, size_type __n)
2528
{
2529
    size_type __sz = __str.size();
2530
    if (__pos > __sz)
2531
        this->__throw_out_of_range();
2532
    return assign(__str.data() + __pos, _VSTD::min(__n, __sz - __pos));
2533
}
2534
2535
template <class _CharT, class _Traits, class _Allocator>
2536
basic_string<_CharT, _Traits, _Allocator>&
2537
basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s)
2538
{
2539
    _LIBCPP_ASSERT(__s != nullptr, "string::assign received nullptr");
2540
    return assign(__s, traits_type::length(__s));
2541
}
2542
2543
// append
2544
2545
template <class _CharT, class _Traits, class _Allocator>
2546
basic_string<_CharT, _Traits, _Allocator>&
2547
basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s, size_type __n)
2548
{
2549
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::append received nullptr");
2550
    size_type __cap = capacity();
2551
    size_type __sz = size();
2552
    if (__cap - __sz >= __n)
2553
    {
2554
        if (__n)
2555
        {
2556
            value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
2557
            traits_type::copy(__p + __sz, __s, __n);
2558
            __sz += __n;
2559
            __set_size(__sz);
2560
            traits_type::assign(__p[__sz], value_type());
2561
        }
2562
    }
2563
    else
2564
        __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __sz, 0, __n, __s);
2565
    return *this;
2566
}
2567
2568
template <class _CharT, class _Traits, class _Allocator>
2569
basic_string<_CharT, _Traits, _Allocator>&
2570
basic_string<_CharT, _Traits, _Allocator>::append(size_type __n, value_type __c)
2571
{
2572
    if (__n)
2573
    {
2574
        size_type __cap = capacity();
2575
        size_type __sz = size();
2576
        if (__cap - __sz < __n)
2577
            __grow_by(__cap, __sz + __n - __cap, __sz, __sz, 0);
2578
        pointer __p = __get_pointer();
2579
        traits_type::assign(_VSTD::__to_raw_pointer(__p) + __sz, __n, __c);
2580
        __sz += __n;
2581
        __set_size(__sz);
2582
        traits_type::assign(__p[__sz], value_type());
2583
    }
2584
    return *this;
2585
}
2586
2587
template <class _CharT, class _Traits, class _Allocator>
2588
void
2589
basic_string<_CharT, _Traits, _Allocator>::push_back(value_type __c)
2590
{
2591
    bool __is_short = !__is_long();
2592
    size_type __cap;
2593
    size_type __sz;
2594
    if (__is_short)
2595
    {
2596
        __cap = __min_cap - 1;
2597
        __sz = __get_short_size();
2598
    }
2599
    else
2600
    {
2601
        __cap = __get_long_cap() - 1;
2602
        __sz = __get_long_size();
2603
    }
2604
    if (__sz == __cap)
2605
    {
2606
        __grow_by(__cap, 1, __sz, __sz, 0);
2607
        __is_short = !__is_long();
2608
    }
2609
    pointer __p;
2610
    if (__is_short)
2611
    {
2612
        __p = __get_short_pointer() + __sz;
2613
        __set_short_size(__sz+1);
2614
    }
2615
    else
2616
    {
2617
        __p = __get_long_pointer() + __sz;
2618
        __set_long_size(__sz+1);
2619
    }
2620
    traits_type::assign(*__p, __c);
2621
    traits_type::assign(*++__p, value_type());
2622
}
2623
2624
template <class _CharT, class _Traits, class _Allocator>
2625
template<class _InputIterator>
2626
typename enable_if
2627
<
2628
     __is_input_iterator  <_InputIterator>::value &&
2629
    !__is_forward_iterator<_InputIterator>::value,
2630
    basic_string<_CharT, _Traits, _Allocator>&
2631
>::type
2632
basic_string<_CharT, _Traits, _Allocator>::append(_InputIterator __first, _InputIterator __last)
2633
{
2634
    for (; __first != __last; ++__first)
2635
        push_back(*__first);
2636
    return *this;
2637
}
2638
2639
template <class _CharT, class _Traits, class _Allocator>
2640
template<class _ForwardIterator>
2641
typename enable_if
2642
<
2643
    __is_forward_iterator<_ForwardIterator>::value,
2644
    basic_string<_CharT, _Traits, _Allocator>&
2645
>::type
2646
basic_string<_CharT, _Traits, _Allocator>::append(_ForwardIterator __first, _ForwardIterator __last)
2647
{
2648
    size_type __sz = size();
2649
    size_type __cap = capacity();
2650
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
2651
    if (__n)
2652
    {
2653
        if (__cap - __sz < __n)
2654
            __grow_by(__cap, __sz + __n - __cap, __sz, __sz, 0);
2655
        pointer __p = __get_pointer() + __sz;
2656
        for (; __first != __last; ++__p, ++__first)
2657
            traits_type::assign(*__p, *__first);
2658
        traits_type::assign(*__p, value_type());
2659
        __set_size(__sz + __n);
2660
    }
2661
    return *this;
2662
}
2663
2664
template <class _CharT, class _Traits, class _Allocator>
2665
inline _LIBCPP_INLINE_VISIBILITY
2666
basic_string<_CharT, _Traits, _Allocator>&
2667
basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str)
2668
{
2669
    return append(__str.data(), __str.size());
2670
}
2671
2672
template <class _CharT, class _Traits, class _Allocator>
2673
basic_string<_CharT, _Traits, _Allocator>&
2674
basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str, size_type __pos, size_type __n)
2675
{
2676
    size_type __sz = __str.size();
2677
    if (__pos > __sz)
2678
        this->__throw_out_of_range();
2679
    return append(__str.data() + __pos, _VSTD::min(__n, __sz - __pos));
2680
}
2681
2682
template <class _CharT, class _Traits, class _Allocator>
2683
basic_string<_CharT, _Traits, _Allocator>&
2684
basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s)
2685
{
2686
    _LIBCPP_ASSERT(__s != nullptr, "string::append received nullptr");
2687
    return append(__s, traits_type::length(__s));
2688
}
2689
2690
// insert
2691
2692
template <class _CharT, class _Traits, class _Allocator>
2693
basic_string<_CharT, _Traits, _Allocator>&
2694
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s, size_type __n)
2695
{
2696
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::insert received nullptr");
2697
    size_type __sz = size();
2698
    if (__pos > __sz)
2699
        this->__throw_out_of_range();
2700
    size_type __cap = capacity();
2701
    if (__cap - __sz >= __n)
2702
    {
2703
        if (__n)
2704
        {
2705
            value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
2706
            size_type __n_move = __sz - __pos;
2707
            if (__n_move != 0)
2708
            {
2709
                if (__p + __pos <= __s && __s < __p + __sz)
2710
                    __s += __n;
2711
                traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
2712
            }
2713
            traits_type::move(__p + __pos, __s, __n);
2714
            __sz += __n;
2715
            __set_size(__sz);
2716
            traits_type::assign(__p[__sz], value_type());
2717
        }
2718
    }
2719
    else
2720
        __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n, __s);
2721
    return *this;
2722
}
2723
2724
template <class _CharT, class _Traits, class _Allocator>
2725
basic_string<_CharT, _Traits, _Allocator>&
2726
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, size_type __n, value_type __c)
2727
{
2728
    size_type __sz = size();
2729
    if (__pos > __sz)
2730
        this->__throw_out_of_range();
2731
    if (__n)
2732
    {
2733
        size_type __cap = capacity();
2734
        value_type* __p;
2735
        if (__cap - __sz >= __n)
2736
        {
2737
            __p = _VSTD::__to_raw_pointer(__get_pointer());
2738
            size_type __n_move = __sz - __pos;
2739
            if (__n_move != 0)
2740
                traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
2741
        }
2742
        else
2743
        {
2744
            __grow_by(__cap, __sz + __n - __cap, __sz, __pos, 0, __n);
2745
            __p = _VSTD::__to_raw_pointer(__get_long_pointer());
2746
        }
2747
        traits_type::assign(__p + __pos, __n, __c);
2748
        __sz += __n;
2749
        __set_size(__sz);
2750
        traits_type::assign(__p[__sz], value_type());
2751
    }
2752
    return *this;
2753
}
2754
2755
template <class _CharT, class _Traits, class _Allocator>
2756
template<class _InputIterator>
2757
typename enable_if
2758
<
2759
     __is_input_iterator  <_InputIterator>::value &&
2760
    !__is_forward_iterator<_InputIterator>::value,
2761
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
2762
>::type
2763
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIterator __first, _InputIterator __last)
2764
{
2765
#if _LIBCPP_DEBUG_LEVEL >= 2
2766
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
2767
        "string::insert(iterator, range) called with an iterator not"
2768
        " referring to this string");
2769
#endif
2770
    size_type __old_sz = size();
2771
    difference_type __ip = __pos - begin();
2772
    for (; __first != __last; ++__first)
2773
        push_back(*__first);
2774
    pointer __p = __get_pointer();
2775
    _VSTD::rotate(__p + __ip, __p + __old_sz, __p + size());
2776
#if _LIBCPP_DEBUG_LEVEL >= 2
2777
    return iterator(this, __p + __ip);
2778
#else
2779
    return iterator(__p + __ip);
2780
#endif
2781
}
2782
2783
template <class _CharT, class _Traits, class _Allocator>
2784
template<class _ForwardIterator>
2785
typename enable_if
2786
<
2787
    __is_forward_iterator<_ForwardIterator>::value,
2788
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
2789
>::type
2790
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last)
2791
{
2792
#if _LIBCPP_DEBUG_LEVEL >= 2
2793
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
2794
        "string::insert(iterator, range) called with an iterator not"
2795
        " referring to this string");
2796
#endif
2797
    size_type __ip = static_cast<size_type>(__pos - begin());
2798
    size_type __sz = size();
2799
    size_type __cap = capacity();
2800
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
2801
    if (__n)
2802
    {
2803
        value_type* __p;
2804
        if (__cap - __sz >= __n)
2805
        {
2806
            __p = _VSTD::__to_raw_pointer(__get_pointer());
2807
            size_type __n_move = __sz - __ip;
2808
            if (__n_move != 0)
2809
                traits_type::move(__p + __ip + __n, __p + __ip, __n_move);
2810
        }
2811
        else
2812
        {
2813
            __grow_by(__cap, __sz + __n - __cap, __sz, __ip, 0, __n);
2814
            __p = _VSTD::__to_raw_pointer(__get_long_pointer());
2815
        }
2816
        __sz += __n;
2817
        __set_size(__sz);
2818
        traits_type::assign(__p[__sz], value_type());
2819
        for (__p += __ip; __first != __last; ++__p, ++__first)
2820
            traits_type::assign(*__p, *__first);
2821
    }
2822
    return begin() + __ip;
2823
}
2824
2825
template <class _CharT, class _Traits, class _Allocator>
2826
inline _LIBCPP_INLINE_VISIBILITY
2827
basic_string<_CharT, _Traits, _Allocator>&
2828
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_string& __str)
2829
{
2830
    return insert(__pos1, __str.data(), __str.size());
2831
}
2832
2833
template <class _CharT, class _Traits, class _Allocator>
2834
basic_string<_CharT, _Traits, _Allocator>&
2835
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_string& __str,
2836
                                                  size_type __pos2, size_type __n)
2837
{
2838
    size_type __str_sz = __str.size();
2839
    if (__pos2 > __str_sz)
2840
        this->__throw_out_of_range();
2841
    return insert(__pos1, __str.data() + __pos2, _VSTD::min(__n, __str_sz - __pos2));
2842
}
2843
2844
template <class _CharT, class _Traits, class _Allocator>
2845
basic_string<_CharT, _Traits, _Allocator>&
2846
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s)
2847
{
2848
    _LIBCPP_ASSERT(__s != nullptr, "string::insert received nullptr");
2849
    return insert(__pos, __s, traits_type::length(__s));
2850
}
2851
2852
template <class _CharT, class _Traits, class _Allocator>
2853
typename basic_string<_CharT, _Traits, _Allocator>::iterator
2854
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, value_type __c)
2855
{
2856
    size_type __ip = static_cast<size_type>(__pos - begin());
2857
    size_type __sz = size();
2858
    size_type __cap = capacity();
2859
    value_type* __p;
2860
    if (__cap == __sz)
2861
    {
2862
        __grow_by(__cap, 1, __sz, __ip, 0, 1);
2863
        __p = _VSTD::__to_raw_pointer(__get_long_pointer());
2864
    }
2865
    else
2866
    {
2867
        __p = _VSTD::__to_raw_pointer(__get_pointer());
2868
        size_type __n_move = __sz - __ip;
2869
        if (__n_move != 0)
2870
            traits_type::move(__p + __ip + 1, __p + __ip, __n_move);
2871
    }
2872
    traits_type::assign(__p[__ip], __c);
2873
    traits_type::assign(__p[++__sz], value_type());
2874
    __set_size(__sz);
2875
    return begin() + static_cast<difference_type>(__ip);
2876
}
2877
2878
template <class _CharT, class _Traits, class _Allocator>
2879
inline _LIBCPP_INLINE_VISIBILITY
2880
typename basic_string<_CharT, _Traits, _Allocator>::iterator
2881
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, size_type __n, value_type __c)
2882
{
2883
#if _LIBCPP_DEBUG_LEVEL >= 2
2884
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
2885
        "string::insert(iterator, n, value) called with an iterator not"
2886
        " referring to this string");
2887
#endif
2888
    difference_type __p = __pos - begin();
2889
    insert(static_cast<size_type>(__p), __n, __c);
2890
    return begin() + __p;
2891
}
2892
2893
// replace
2894
2895
template <class _CharT, class _Traits, class _Allocator>
2896
basic_string<_CharT, _Traits, _Allocator>&
2897
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2)
2898
{
2899
    _LIBCPP_ASSERT(__n2 == 0 || __s != nullptr, "string::replace received nullptr");
2900
    size_type __sz = size();
2901
    if (__pos > __sz)
2902
        this->__throw_out_of_range();
2903
    __n1 = _VSTD::min(__n1, __sz - __pos);
2904
    size_type __cap = capacity();
2905
    if (__cap - __sz + __n1 >= __n2)
2906
    {
2907
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
2908
        if (__n1 != __n2)
2909
        {
2910
            size_type __n_move = __sz - __pos - __n1;
2911
            if (__n_move != 0)
2912
            {
2913
                if (__n1 > __n2)
2914
                {
2915
                    traits_type::move(__p + __pos, __s, __n2);
2916
                    traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
2917
                    goto __finish;
2918
                }
2919
                if (__p + __pos < __s && __s < __p + __sz)
2920
                {
2921
                    if (__p + __pos + __n1 <= __s)
2922
                        __s += __n2 - __n1;
2923
                    else // __p + __pos < __s < __p + __pos + __n1
2924
                    {
2925
                        traits_type::move(__p + __pos, __s, __n1);
2926
                        __pos += __n1;
2927
                        __s += __n2;
2928
                        __n2 -= __n1;
2929
                        __n1 = 0;
2930
                    }
2931
                }
2932
                traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
2933
            }
2934
        }
2935
        traits_type::move(__p + __pos, __s, __n2);
2936
__finish:
2937
        __sz += __n2 - __n1;
2938
        __set_size(__sz);
2939
        __invalidate_iterators_past(__sz);
2940
        traits_type::assign(__p[__sz], value_type());
2941
    }
2942
    else
2943
        __grow_by_and_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2, __s);
2944
    return *this;
2945
}
2946
2947
template <class _CharT, class _Traits, class _Allocator>
2948
basic_string<_CharT, _Traits, _Allocator>&
2949
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, size_type __n2, value_type __c)
2950
{
2951
    size_type __sz = size();
2952
    if (__pos > __sz)
2953
        this->__throw_out_of_range();
2954
    __n1 = _VSTD::min(__n1, __sz - __pos);
2955
    size_type __cap = capacity();
2956
    value_type* __p;
2957
    if (__cap - __sz + __n1 >= __n2)
2958
    {
2959
        __p = _VSTD::__to_raw_pointer(__get_pointer());
2960
        if (__n1 != __n2)
2961
        {
2962
            size_type __n_move = __sz - __pos - __n1;
2963
            if (__n_move != 0)
2964
                traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
2965
        }
2966
    }
2967
    else
2968
    {
2969
        __grow_by(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2);
2970
        __p = _VSTD::__to_raw_pointer(__get_long_pointer());
2971
    }
2972
    traits_type::assign(__p + __pos, __n2, __c);
2973
    __sz += __n2 - __n1;
2974
    __set_size(__sz);
2975
    __invalidate_iterators_past(__sz);
2976
    traits_type::assign(__p[__sz], value_type());
2977
    return *this;
2978
}
2979
2980
template <class _CharT, class _Traits, class _Allocator>
2981
template<class _InputIterator>
2982
typename enable_if
2983
<
2984
    __is_input_iterator<_InputIterator>::value,
2985
    basic_string<_CharT, _Traits, _Allocator>&
2986
>::type
2987
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2,
2988
                                                   _InputIterator __j1, _InputIterator __j2)
2989
{
2990
    for (; true; ++__i1, ++__j1)
2991
    {
2992
        if (__i1 == __i2)
2993
        {
2994
            if (__j1 != __j2)
2995
                insert(__i1, __j1, __j2);
2996
            break;
2997
        }
2998
        if (__j1 == __j2)
2999
        {
3000
            erase(__i1, __i2);
3001
            break;
3002
        }
3003
        traits_type::assign(const_cast<value_type&>(*__i1), *__j1);
3004
    }
3005
    return *this;
3006
}
3007
3008
template <class _CharT, class _Traits, class _Allocator>
3009
inline _LIBCPP_INLINE_VISIBILITY
3010
basic_string<_CharT, _Traits, _Allocator>&
3011
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const basic_string& __str)
3012
{
3013
    return replace(__pos1, __n1, __str.data(), __str.size());
3014
}
3015
3016
template <class _CharT, class _Traits, class _Allocator>
3017
basic_string<_CharT, _Traits, _Allocator>&
3018
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const basic_string& __str,
3019
                                                   size_type __pos2, size_type __n2)
3020
{
3021
    size_type __str_sz = __str.size();
3022
    if (__pos2 > __str_sz)
3023
        this->__throw_out_of_range();
3024
    return replace(__pos1, __n1, __str.data() + __pos2, _VSTD::min(__n2, __str_sz - __pos2));
3025
}
3026
3027
template <class _CharT, class _Traits, class _Allocator>
3028
basic_string<_CharT, _Traits, _Allocator>&
3029
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s)
3030
{
3031
    _LIBCPP_ASSERT(__s != nullptr, "string::replace received nullptr");
3032
    return replace(__pos, __n1, __s, traits_type::length(__s));
3033
}
3034
3035
template <class _CharT, class _Traits, class _Allocator>
3036
inline _LIBCPP_INLINE_VISIBILITY
3037
basic_string<_CharT, _Traits, _Allocator>&
3038
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const basic_string& __str)
3039
{
3040
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1),
3041
                   __str.data(), __str.size());
3042
}
3043
3044
template <class _CharT, class _Traits, class _Allocator>
3045
inline _LIBCPP_INLINE_VISIBILITY
3046
basic_string<_CharT, _Traits, _Allocator>&
3047
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n)
3048
{
3049
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s, __n);
3050
}
3051
3052
template <class _CharT, class _Traits, class _Allocator>
3053
inline _LIBCPP_INLINE_VISIBILITY
3054
basic_string<_CharT, _Traits, _Allocator>&
3055
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const value_type* __s)
3056
{
3057
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s);
3058
}
3059
3060
template <class _CharT, class _Traits, class _Allocator>
3061
inline _LIBCPP_INLINE_VISIBILITY
3062
basic_string<_CharT, _Traits, _Allocator>&
3063
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c)
3064
{
3065
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __n, __c);
3066
}
3067
3068
// erase
3069
3070
template <class _CharT, class _Traits, class _Allocator>
3071
basic_string<_CharT, _Traits, _Allocator>&
3072
basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n)
3073
{
3074
    size_type __sz = size();
3075
    if (__pos > __sz)
3076
        this->__throw_out_of_range();
3077
    if (__n)
3078
    {
3079
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
3080
        __n = _VSTD::min(__n, __sz - __pos);
3081
        size_type __n_move = __sz - __pos - __n;
3082
        if (__n_move != 0)
3083
            traits_type::move(__p + __pos, __p + __pos + __n, __n_move);
3084
        __sz -= __n;
3085
        __set_size(__sz);
3086
        __invalidate_iterators_past(__sz);
3087
        traits_type::assign(__p[__sz], value_type());
3088
    }
3089
    return *this;
3090
}
3091
3092
template <class _CharT, class _Traits, class _Allocator>
3093
inline _LIBCPP_INLINE_VISIBILITY
3094
typename basic_string<_CharT, _Traits, _Allocator>::iterator
3095
basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __pos)
3096
{
3097
#if _LIBCPP_DEBUG_LEVEL >= 2
3098
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
3099
        "string::erase(iterator) called with an iterator not"
3100
        " referring to this string");
3101
#endif
3102
    _LIBCPP_ASSERT(__pos != end(),
3103
        "string::erase(iterator) called with a non-dereferenceable iterator");
3104
    iterator __b = begin();
3105
    size_type __r = static_cast<size_type>(__pos - __b);
3106
    erase(__r, 1);
3107
    return __b + static_cast<difference_type>(__r);
3108
}
3109
3110
template <class _CharT, class _Traits, class _Allocator>
3111
inline _LIBCPP_INLINE_VISIBILITY
3112
typename basic_string<_CharT, _Traits, _Allocator>::iterator
3113
basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __first, const_iterator __last)
3114
{
3115
#if _LIBCPP_DEBUG_LEVEL >= 2
3116
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__first) == this,
3117
        "string::erase(iterator,  iterator) called with an iterator not"
3118
        " referring to this string");
3119
#endif
3120
    _LIBCPP_ASSERT(__first <= __last, "string::erase(first, last) called with invalid range");
3121
    iterator __b = begin();
3122
    size_type __r = static_cast<size_type>(__first - __b);
3123
    erase(__r, static_cast<size_type>(__last - __first));
3124
    return __b + static_cast<difference_type>(__r);
3125
}
3126
3127
template <class _CharT, class _Traits, class _Allocator>
3128
inline _LIBCPP_INLINE_VISIBILITY
3129
void
3130
basic_string<_CharT, _Traits, _Allocator>::pop_back()
3131
{
3132
    _LIBCPP_ASSERT(!empty(), "string::pop_back(): string is already empty");
3133
    size_type __sz;
3134
    if (__is_long())
3135
    {
3136
        __sz = __get_long_size() - 1;
3137
        __set_long_size(__sz);
3138
        traits_type::assign(*(__get_long_pointer() + __sz), value_type());
3139
    }
3140
    else
3141
    {
3142
        __sz = __get_short_size() - 1;
3143
        __set_short_size(__sz);
3144
        traits_type::assign(*(__get_short_pointer() + __sz), value_type());
3145
    }
3146
    __invalidate_iterators_past(__sz);
3147
}
3148
3149
template <class _CharT, class _Traits, class _Allocator>
3150
inline _LIBCPP_INLINE_VISIBILITY
3151
void
3152
basic_string<_CharT, _Traits, _Allocator>::clear() _NOEXCEPT
3153
{
3154
    __invalidate_all_iterators();
3155
    if (__is_long())
3156
    {
3157
        traits_type::assign(*__get_long_pointer(), value_type());
3158
        __set_long_size(0);
3159
    }
3160
    else
3161
    {
3162
        traits_type::assign(*__get_short_pointer(), value_type());
3163
        __set_short_size(0);
3164
    }
3165
}
3166
3167
template <class _CharT, class _Traits, class _Allocator>
3168
inline _LIBCPP_INLINE_VISIBILITY
3169
void
3170
basic_string<_CharT, _Traits, _Allocator>::__erase_to_end(size_type __pos)
3171
{
3172
    if (__is_long())
3173
    {
3174
        traits_type::assign(*(__get_long_pointer() + __pos), value_type());
3175
        __set_long_size(__pos);
3176
    }
3177
    else
3178
    {
3179
        traits_type::assign(*(__get_short_pointer() + __pos), value_type());
3180
        __set_short_size(__pos);
3181
    }
3182
    __invalidate_iterators_past(__pos);
3183
}
3184
3185
template <class _CharT, class _Traits, class _Allocator>
3186
void
3187
basic_string<_CharT, _Traits, _Allocator>::resize(size_type __n, value_type __c)
3188
{
3189
    size_type __sz = size();
3190
    if (__n > __sz)
3191
        append(__n - __sz, __c);
3192
    else
3193
        __erase_to_end(__n);
3194
}
3195
3196
template <class _CharT, class _Traits, class _Allocator>
3197
inline _LIBCPP_INLINE_VISIBILITY
3198
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3199
basic_string<_CharT, _Traits, _Allocator>::max_size() const _NOEXCEPT
3200
{
3201
    size_type __m = __alloc_traits::max_size(__alloc());
3202
#if _LIBCPP_BIG_ENDIAN
3203
    return (__m <= ~__long_mask ? __m : __m/2) - __alignment;
3204
#else
3205
    return __m - __alignment;
3206
#endif
3207
}
3208
3209
template <class _CharT, class _Traits, class _Allocator>
3210
void
3211
basic_string<_CharT, _Traits, _Allocator>::reserve(size_type __res_arg)
3212
{
3213
    if (__res_arg > max_size())
3214
        this->__throw_length_error();
3215
    size_type __cap = capacity();
3216
    size_type __sz = size();
3217
    __res_arg = _VSTD::max(__res_arg, __sz);
3218
    __res_arg = __recommend(__res_arg);
3219
    if (__res_arg != __cap)
3220
    {
3221
        pointer __new_data, __p;
3222
        bool __was_long, __now_long;
3223
        if (__res_arg == __min_cap - 1)
3224
        {
3225
            __was_long = true;
3226
            __now_long = false;
3227
            __new_data = __get_short_pointer();
3228
            __p = __get_long_pointer();
3229
        }
3230
        else
3231
        {
3232
            if (__res_arg > __cap)
3233
                __new_data = __alloc_traits::allocate(__alloc(), __res_arg+1);
3234
            else
3235
            {
3236
            #ifndef _LIBCPP_NO_EXCEPTIONS
3237
                try
3238
                {
3239
            #endif  // _LIBCPP_NO_EXCEPTIONS
3240
                    __new_data = __alloc_traits::allocate(__alloc(), __res_arg+1);
3241
            #ifndef _LIBCPP_NO_EXCEPTIONS
3242
                }
3243
                catch (...)
3244
                {
3245
                    return;
3246
                }
3247
            #else  // _LIBCPP_NO_EXCEPTIONS
3248
                if (__new_data == nullptr)
3249
                    return;
3250
            #endif  // _LIBCPP_NO_EXCEPTIONS
3251
            }
3252
            __now_long = true;
3253
            __was_long = __is_long();
3254
            __p = __get_pointer();
3255
        }
3256
        traits_type::copy(_VSTD::__to_raw_pointer(__new_data),
3257
                          _VSTD::__to_raw_pointer(__p), size()+1);
3258
        if (__was_long)
3259
            __alloc_traits::deallocate(__alloc(), __p, __cap+1);
3260
        if (__now_long)
3261
        {
3262
            __set_long_cap(__res_arg+1);
3263
            __set_long_size(__sz);
3264
            __set_long_pointer(__new_data);
3265
        }
3266
        else
3267
            __set_short_size(__sz);
3268
        __invalidate_all_iterators();
3269
    }
3270
}
3271
3272
template <class _CharT, class _Traits, class _Allocator>
3273
inline _LIBCPP_INLINE_VISIBILITY
3274
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
3275
basic_string<_CharT, _Traits, _Allocator>::operator[](size_type __pos) const
3276
{
3277
    _LIBCPP_ASSERT(__pos <= size(), "string index out of bounds");
3278
    return *(data() + __pos);
3279
}
3280
3281
template <class _CharT, class _Traits, class _Allocator>
3282
inline _LIBCPP_INLINE_VISIBILITY
3283
typename basic_string<_CharT, _Traits, _Allocator>::reference
3284
basic_string<_CharT, _Traits, _Allocator>::operator[](size_type __pos)
3285
{
3286
    _LIBCPP_ASSERT(__pos <= size(), "string index out of bounds");
3287
    return *(__get_pointer() + __pos);
3288
}
3289
3290
template <class _CharT, class _Traits, class _Allocator>
3291
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
3292
basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) const
3293
{
3294
    if (__n >= size())
3295
        this->__throw_out_of_range();
3296
    return (*this)[__n];
3297
}
3298
3299
template <class _CharT, class _Traits, class _Allocator>
3300
typename basic_string<_CharT, _Traits, _Allocator>::reference
3301
basic_string<_CharT, _Traits, _Allocator>::at(size_type __n)
3302
{
3303
    if (__n >= size())
3304
        this->__throw_out_of_range();
3305
    return (*this)[__n];
3306
}
3307
3308
template <class _CharT, class _Traits, class _Allocator>
3309
inline _LIBCPP_INLINE_VISIBILITY
3310
typename basic_string<_CharT, _Traits, _Allocator>::reference
3311
basic_string<_CharT, _Traits, _Allocator>::front()
3312
{
3313
    _LIBCPP_ASSERT(!empty(), "string::front(): string is empty");
3314
    return *__get_pointer();
3315
}
3316
3317
template <class _CharT, class _Traits, class _Allocator>
3318
inline _LIBCPP_INLINE_VISIBILITY
3319
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
3320
basic_string<_CharT, _Traits, _Allocator>::front() const
3321
{
3322
    _LIBCPP_ASSERT(!empty(), "string::front(): string is empty");
3323
    return *data();
3324
}
3325
3326
template <class _CharT, class _Traits, class _Allocator>
3327
inline _LIBCPP_INLINE_VISIBILITY
3328
typename basic_string<_CharT, _Traits, _Allocator>::reference
3329
basic_string<_CharT, _Traits, _Allocator>::back()
3330
{
3331
    _LIBCPP_ASSERT(!empty(), "string::back(): string is empty");
3332
    return *(__get_pointer() + size() - 1);
3333
}
3334
3335
template <class _CharT, class _Traits, class _Allocator>
3336
inline _LIBCPP_INLINE_VISIBILITY
3337
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
3338
basic_string<_CharT, _Traits, _Allocator>::back() const
3339
{
3340
    _LIBCPP_ASSERT(!empty(), "string::back(): string is empty");
3341
    return *(data() + size() - 1);
3342
}
3343
3344
template <class _CharT, class _Traits, class _Allocator>
3345
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3346
basic_string<_CharT, _Traits, _Allocator>::copy(value_type* __s, size_type __n, size_type __pos) const
3347
{
3348
    size_type __sz = size();
3349
    if (__pos > __sz)
3350
        this->__throw_out_of_range();
3351
    size_type __rlen = _VSTD::min(__n, __sz - __pos);
3352
    traits_type::copy(__s, data() + __pos, __rlen);
3353
    return __rlen;
3354
}
3355
3356
template <class _CharT, class _Traits, class _Allocator>
3357
inline _LIBCPP_INLINE_VISIBILITY
3358
basic_string<_CharT, _Traits, _Allocator>
3359
basic_string<_CharT, _Traits, _Allocator>::substr(size_type __pos, size_type __n) const
3360
{
3361
    return basic_string(*this, __pos, __n, __alloc());
3362
}
3363
3364
template <class _CharT, class _Traits, class _Allocator>
3365
inline _LIBCPP_INLINE_VISIBILITY
3366
void
3367
basic_string<_CharT, _Traits, _Allocator>::swap(basic_string& __str)
3368
#if _LIBCPP_STD_VER >= 14
3369
        _NOEXCEPT
3370
#else
3371
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
3372
                    __is_nothrow_swappable<allocator_type>::value)
3373
#endif
3374
{
3375
#if _LIBCPP_DEBUG_LEVEL >= 2
3376
    if (!__is_long())
3377
        __get_db()->__invalidate_all(this);
3378
    if (!__str.__is_long())
3379
        __get_db()->__invalidate_all(&__str);
3380
    __get_db()->swap(this, &__str);
3381
#endif
3382
    _VSTD::swap(__r_.first(), __str.__r_.first());
3383
    __swap_allocator(__alloc(), __str.__alloc());
3384
}
3385
3386
// find
3387
3388
template <class _Traits>
3389
struct _LIBCPP_HIDDEN __traits_eq
3390
{
3391
    typedef typename _Traits::char_type char_type;
3392
    _LIBCPP_INLINE_VISIBILITY
3393
    bool operator()(const char_type& __x, const char_type& __y) _NOEXCEPT
3394
        {return _Traits::eq(__x, __y);}
3395
};
3396
3397
template<class _CharT, class _Traits, class _Allocator>
3398
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3399
basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s,
3400
                                                size_type __pos,
3401
                                                size_type __n) const _NOEXCEPT
3402
{
3403
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find(): received nullptr");
3404
    return _VSTD::__str_find<value_type, size_type, traits_type, npos>
3405
        (data(), size(), __s, __pos, __n);
3406
}
3407
3408
template<class _CharT, class _Traits, class _Allocator>
3409
inline _LIBCPP_INLINE_VISIBILITY
3410
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3411
basic_string<_CharT, _Traits, _Allocator>::find(const basic_string& __str,
3412
                                                size_type __pos) const _NOEXCEPT
3413
{
3414
    return _VSTD::__str_find<value_type, size_type, traits_type, npos>
3415
        (data(), size(), __str.data(), __pos, __str.size());
3416
}
3417
3418
template<class _CharT, class _Traits, class _Allocator>
3419
inline _LIBCPP_INLINE_VISIBILITY
3420
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3421
basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s,
3422
                                                size_type __pos) const _NOEXCEPT
3423
{
3424
    _LIBCPP_ASSERT(__s != nullptr, "string::find(): received nullptr");
3425
    return _VSTD::__str_find<value_type, size_type, traits_type, npos>
3426
        (data(), size(), __s, __pos, traits_type::length(__s));
3427
}
3428
3429
template<class _CharT, class _Traits, class _Allocator>
3430
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3431
basic_string<_CharT, _Traits, _Allocator>::find(value_type __c,
3432
                                                size_type __pos) const _NOEXCEPT
3433
{
3434
    return _VSTD::__str_find<value_type, size_type, traits_type, npos>
3435
        (data(), size(), __c, __pos);
3436
}
3437
3438
// rfind
3439
3440
template<class _CharT, class _Traits, class _Allocator>
3441
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3442
basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s,
3443
                                                 size_type __pos,
3444
                                                 size_type __n) const _NOEXCEPT
3445
{
3446
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::rfind(): received nullptr");
3447
    return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
3448
        (data(), size(), __s, __pos, __n);
3449
}
3450
3451
template<class _CharT, class _Traits, class _Allocator>
3452
inline _LIBCPP_INLINE_VISIBILITY
3453
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3454
basic_string<_CharT, _Traits, _Allocator>::rfind(const basic_string& __str,
3455
                                                 size_type __pos) const _NOEXCEPT
3456
{
3457
    return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
3458
        (data(), size(), __str.data(), __pos, __str.size());
3459
}
3460
3461
template<class _CharT, class _Traits, class _Allocator>
3462
inline _LIBCPP_INLINE_VISIBILITY
3463
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3464
basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s,
3465
                                                 size_type __pos) const _NOEXCEPT
3466
{
3467
    _LIBCPP_ASSERT(__s != nullptr, "string::rfind(): received nullptr");
3468
    return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
3469
        (data(), size(), __s, __pos, traits_type::length(__s));
3470
}
3471
3472
template<class _CharT, class _Traits, class _Allocator>
3473
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3474
basic_string<_CharT, _Traits, _Allocator>::rfind(value_type __c,
3475
                                                 size_type __pos) const _NOEXCEPT
3476
{
3477
    return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
3478
        (data(), size(), __c, __pos);
3479
}
3480
3481
// find_first_of
3482
3483
template<class _CharT, class _Traits, class _Allocator>
3484
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3485
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s,
3486
                                                         size_type __pos,
3487
                                                         size_type __n) const _NOEXCEPT
3488
{
3489
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_first_of(): received nullptr");
3490
    return _VSTD::__str_find_first_of<value_type, size_type, traits_type, npos>
3491
        (data(), size(), __s, __pos, __n);
3492
}
3493
3494
template<class _CharT, class _Traits, class _Allocator>
3495
inline _LIBCPP_INLINE_VISIBILITY
3496
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3497
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const basic_string& __str,
3498
                                                         size_type __pos) const _NOEXCEPT
3499
{
3500
    return _VSTD::__str_find_first_of<value_type, size_type, traits_type, npos>
3501
        (data(), size(), __str.data(), __pos, __str.size());
3502
}
3503
3504
template<class _CharT, class _Traits, class _Allocator>
3505
inline _LIBCPP_INLINE_VISIBILITY
3506
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3507
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s,
3508
                                                         size_type __pos) const _NOEXCEPT
3509
{
3510
    _LIBCPP_ASSERT(__s != nullptr, "string::find_first_of(): received nullptr");
3511
    return _VSTD::__str_find_first_of<value_type, size_type, traits_type, npos>
3512
        (data(), size(), __s, __pos, traits_type::length(__s));
3513
}
3514
3515
template<class _CharT, class _Traits, class _Allocator>
3516
inline _LIBCPP_INLINE_VISIBILITY
3517
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3518
basic_string<_CharT, _Traits, _Allocator>::find_first_of(value_type __c,
3519
                                                         size_type __pos) const _NOEXCEPT
3520
{
3521
    return find(__c, __pos);
3522
}
3523
3524
// find_last_of
3525
3526
template<class _CharT, class _Traits, class _Allocator>
3527
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3528
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s,
3529
                                                        size_type __pos,
3530
                                                        size_type __n) const _NOEXCEPT
3531
{
3532
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_last_of(): received nullptr");
3533
    return _VSTD::__str_find_last_of<value_type, size_type, traits_type, npos>
3534
        (data(), size(), __s, __pos, __n);
3535
}
3536
3537
template<class _CharT, class _Traits, class _Allocator>
3538
inline _LIBCPP_INLINE_VISIBILITY
3539
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3540
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const basic_string& __str,
3541
                                                        size_type __pos) const _NOEXCEPT
3542
{
3543
    return _VSTD::__str_find_last_of<value_type, size_type, traits_type, npos>
3544
        (data(), size(), __str.data(), __pos, __str.size());
3545
}
3546
3547
template<class _CharT, class _Traits, class _Allocator>
3548
inline _LIBCPP_INLINE_VISIBILITY
3549
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3550
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s,
3551
                                                        size_type __pos) const _NOEXCEPT
3552
{
3553
    _LIBCPP_ASSERT(__s != nullptr, "string::find_last_of(): received nullptr");
3554
    return _VSTD::__str_find_last_of<value_type, size_type, traits_type, npos>
3555
        (data(), size(), __s, __pos, traits_type::length(__s));
3556
}
3557
3558
template<class _CharT, class _Traits, class _Allocator>
3559
inline _LIBCPP_INLINE_VISIBILITY
3560
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3561
basic_string<_CharT, _Traits, _Allocator>::find_last_of(value_type __c,
3562
                                                        size_type __pos) const _NOEXCEPT
3563
{
3564
    return rfind(__c, __pos);
3565
}
3566
3567
// find_first_not_of
3568
3569
template<class _CharT, class _Traits, class _Allocator>
3570
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3571
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s,
3572
                                                             size_type __pos,
3573
                                                             size_type __n) const _NOEXCEPT
3574
{
3575
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_first_not_of(): received nullptr");
3576
    return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
3577
        (data(), size(), __s, __pos, __n);
3578
}
3579
3580
template<class _CharT, class _Traits, class _Allocator>
3581
inline _LIBCPP_INLINE_VISIBILITY
3582
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3583
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const basic_string& __str,
3584
                                                             size_type __pos) const _NOEXCEPT
3585
{
3586
    return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
3587
        (data(), size(), __str.data(), __pos, __str.size());
3588
}
3589
3590
template<class _CharT, class _Traits, class _Allocator>
3591
inline _LIBCPP_INLINE_VISIBILITY
3592
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3593
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s,
3594
                                                             size_type __pos) const _NOEXCEPT
3595
{
3596
    _LIBCPP_ASSERT(__s != nullptr, "string::find_first_not_of(): received nullptr");
3597
    return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
3598
        (data(), size(), __s, __pos, traits_type::length(__s));
3599
}
3600
3601
template<class _CharT, class _Traits, class _Allocator>
3602
inline _LIBCPP_INLINE_VISIBILITY
3603
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3604
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(value_type __c,
3605
                                                             size_type __pos) const _NOEXCEPT
3606
{
3607
    return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
3608
        (data(), size(), __c, __pos);
3609
}
3610
3611
// find_last_not_of
3612
3613
template<class _CharT, class _Traits, class _Allocator>
3614
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3615
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s,
3616
                                                            size_type __pos,
3617
                                                            size_type __n) const _NOEXCEPT
3618
{
3619
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_last_not_of(): received nullptr");
3620
    return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
3621
        (data(), size(), __s, __pos, __n);
3622
}
3623
3624
template<class _CharT, class _Traits, class _Allocator>
3625
inline _LIBCPP_INLINE_VISIBILITY
3626
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3627
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const basic_string& __str,
3628
                                                            size_type __pos) const _NOEXCEPT
3629
{
3630
    return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
3631
        (data(), size(), __str.data(), __pos, __str.size());
3632
}
3633
3634
template<class _CharT, class _Traits, class _Allocator>
3635
inline _LIBCPP_INLINE_VISIBILITY
3636
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3637
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s,
3638
                                                            size_type __pos) const _NOEXCEPT
3639
{
3640
    _LIBCPP_ASSERT(__s != nullptr, "string::find_last_not_of(): received nullptr");
3641
    return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
3642
        (data(), size(), __s, __pos, traits_type::length(__s));
3643
}
3644
3645
template<class _CharT, class _Traits, class _Allocator>
3646
inline _LIBCPP_INLINE_VISIBILITY
3647
typename basic_string<_CharT, _Traits, _Allocator>::size_type
3648
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(value_type __c,
3649
                                                            size_type __pos) const _NOEXCEPT
3650
{
3651
    return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
3652
        (data(), size(), __c, __pos);
3653
}
3654
3655
// compare
3656
3657
template <class _CharT, class _Traits, class _Allocator>
3658
inline _LIBCPP_INLINE_VISIBILITY
3659
int
3660
basic_string<_CharT, _Traits, _Allocator>::compare(const basic_string& __str) const _NOEXCEPT
3661
{
3662
    size_t __lhs_sz = size();
3663
    size_t __rhs_sz = __str.size();
3664
    int __result = traits_type::compare(data(), __str.data(),
3665
                                        _VSTD::min(__lhs_sz, __rhs_sz));
3666
    if (__result != 0)
3667
        return __result;
3668
    if (__lhs_sz < __rhs_sz)
3669
        return -1;
3670
    if (__lhs_sz > __rhs_sz)
3671
        return 1;
3672
    return 0;
3673
}
3674
3675
template <class _CharT, class _Traits, class _Allocator>
3676
inline _LIBCPP_INLINE_VISIBILITY
3677
int
3678
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
3679
                                                   size_type __n1,
3680
                                                   const basic_string& __str) const
3681
{
3682
    return compare(__pos1, __n1, __str.data(), __str.size());
3683
}
3684
3685
template <class _CharT, class _Traits, class _Allocator>
3686
int
3687
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
3688
                                                   size_type __n1,
3689
                                                   const basic_string& __str,
3690
                                                   size_type __pos2,
3691
                                                   size_type __n2) const
3692
{
3693
    size_type __sz = __str.size();
3694
    if (__pos2 > __sz)
3695
        this->__throw_out_of_range();
3696
    return compare(__pos1, __n1, __str.data() + __pos2, _VSTD::min(__n2,
3697
                                                                  __sz - __pos2));
3698
}
3699
3700
template <class _CharT, class _Traits, class _Allocator>
3701
int
3702
basic_string<_CharT, _Traits, _Allocator>::compare(const value_type* __s) const _NOEXCEPT
3703
{
3704
    _LIBCPP_ASSERT(__s != nullptr, "string::compare(): received nullptr");
3705
    return compare(0, npos, __s, traits_type::length(__s));
3706
}
3707
3708
template <class _CharT, class _Traits, class _Allocator>
3709
int
3710
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
3711
                                                   size_type __n1,
3712
                                                   const value_type* __s) const
3713
{
3714
    _LIBCPP_ASSERT(__s != nullptr, "string::compare(): received nullptr");
3715
    return compare(__pos1, __n1, __s, traits_type::length(__s));
3716
}
3717
3718
template <class _CharT, class _Traits, class _Allocator>
3719
int
3720
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
3721
                                                   size_type __n1,
3722
                                                   const value_type* __s,
3723
                                                   size_type __n2) const
3724
{
3725
    _LIBCPP_ASSERT(__n2 == 0 || __s != nullptr, "string::compare(): received nullptr");
3726
    size_type __sz = size();
3727
    if (__pos1 > __sz || __n2 == npos)
3728
        this->__throw_out_of_range();
3729
    size_type __rlen = _VSTD::min(__n1, __sz - __pos1);
3730
    int __r = traits_type::compare(data() + __pos1, __s, _VSTD::min(__rlen, __n2));
3731
    if (__r == 0)
3732
    {
3733
        if (__rlen < __n2)
3734
            __r = -1;
3735
        else if (__rlen > __n2)
3736
            __r = 1;
3737
    }
3738
    return __r;
3739
}
3740
3741
// __invariants
3742
3743
template<class _CharT, class _Traits, class _Allocator>
3744
inline _LIBCPP_INLINE_VISIBILITY
3745
bool
3746
basic_string<_CharT, _Traits, _Allocator>::__invariants() const
3747
{
3748
    if (size() > capacity())
3749
        return false;
3750
    if (capacity() < __min_cap - 1)
3751
        return false;
3752
    if (data() == 0)
3753
        return false;
3754
    if (data()[size()] != value_type(0))
3755
        return false;
3756
    return true;
3757
}
3758
3759
// operator==
3760
3761
template<class _CharT, class _Traits, class _Allocator>
3762
inline _LIBCPP_INLINE_VISIBILITY
3763
bool
3764
operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3765
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3766
{
3767
    size_t __lhs_sz = __lhs.size();
3768
    return __lhs_sz == __rhs.size() && _Traits::compare(__lhs.data(),
3769
                                                        __rhs.data(),
3770
                                                        __lhs_sz) == 0;
3771
}
3772
3773
template<class _Allocator>
3774
inline _LIBCPP_INLINE_VISIBILITY
3775
bool
3776
operator==(const basic_string<char, char_traits<char>, _Allocator>& __lhs,
3777
           const basic_string<char, char_traits<char>, _Allocator>& __rhs) _NOEXCEPT
3778
{
3779
    size_t __lhs_sz = __lhs.size();
3780
    if (__lhs_sz != __rhs.size())
3781
        return false;
3782
    const char* __lp = __lhs.data();
3783
    const char* __rp = __rhs.data();
3784
    if (__lhs.__is_long())
3785
        return char_traits<char>::compare(__lp, __rp, __lhs_sz) == 0;
3786
    for (; __lhs_sz != 0; --__lhs_sz, ++__lp, ++__rp)
3787
        if (*__lp != *__rp)
3788
            return false;
3789
    return true;
3790
}
3791
3792
template<class _CharT, class _Traits, class _Allocator>
3793
inline _LIBCPP_INLINE_VISIBILITY
3794
bool
3795
operator==(const _CharT* __lhs,
3796
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3797
{
3798
    return __rhs.compare(__lhs) == 0;
3799
}
3800
3801
template<class _CharT, class _Traits, class _Allocator>
3802
inline _LIBCPP_INLINE_VISIBILITY
3803
bool
3804
operator==(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
3805
           const _CharT* __rhs) _NOEXCEPT
3806
{
3807
    return __lhs.compare(__rhs) == 0;
3808
}
3809
3810
// operator!=
3811
3812
template<class _CharT, class _Traits, class _Allocator>
3813
inline _LIBCPP_INLINE_VISIBILITY
3814
bool
3815
operator!=(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
3816
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3817
{
3818
    return !(__lhs == __rhs);
3819
}
3820
3821
template<class _CharT, class _Traits, class _Allocator>
3822
inline _LIBCPP_INLINE_VISIBILITY
3823
bool
3824
operator!=(const _CharT* __lhs,
3825
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3826
{
3827
    return !(__lhs == __rhs);
3828
}
3829
3830
template<class _CharT, class _Traits, class _Allocator>
3831
inline _LIBCPP_INLINE_VISIBILITY
3832
bool
3833
operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3834
           const _CharT* __rhs) _NOEXCEPT
3835
{
3836
    return !(__lhs == __rhs);
3837
}
3838
3839
// operator<
3840
3841
template<class _CharT, class _Traits, class _Allocator>
3842
inline _LIBCPP_INLINE_VISIBILITY
3843
bool
3844
operator< (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3845
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3846
{
3847
    return __lhs.compare(__rhs) < 0;
3848
}
3849
3850
template<class _CharT, class _Traits, class _Allocator>
3851
inline _LIBCPP_INLINE_VISIBILITY
3852
bool
3853
operator< (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3854
           const _CharT* __rhs) _NOEXCEPT
3855
{
3856
    return __lhs.compare(__rhs) < 0;
3857
}
3858
3859
template<class _CharT, class _Traits, class _Allocator>
3860
inline _LIBCPP_INLINE_VISIBILITY
3861
bool
3862
operator< (const _CharT* __lhs,
3863
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3864
{
3865
    return __rhs.compare(__lhs) > 0;
3866
}
3867
3868
// operator>
3869
3870
template<class _CharT, class _Traits, class _Allocator>
3871
inline _LIBCPP_INLINE_VISIBILITY
3872
bool
3873
operator> (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3874
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3875
{
3876
    return __rhs < __lhs;
3877
}
3878
3879
template<class _CharT, class _Traits, class _Allocator>
3880
inline _LIBCPP_INLINE_VISIBILITY
3881
bool
3882
operator> (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3883
           const _CharT* __rhs) _NOEXCEPT
3884
{
3885
    return __rhs < __lhs;
3886
}
3887
3888
template<class _CharT, class _Traits, class _Allocator>
3889
inline _LIBCPP_INLINE_VISIBILITY
3890
bool
3891
operator> (const _CharT* __lhs,
3892
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3893
{
3894
    return __rhs < __lhs;
3895
}
3896
3897
// operator<=
3898
3899
template<class _CharT, class _Traits, class _Allocator>
3900
inline _LIBCPP_INLINE_VISIBILITY
3901
bool
3902
operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3903
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3904
{
3905
    return !(__rhs < __lhs);
3906
}
3907
3908
template<class _CharT, class _Traits, class _Allocator>
3909
inline _LIBCPP_INLINE_VISIBILITY
3910
bool
3911
operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3912
           const _CharT* __rhs) _NOEXCEPT
3913
{
3914
    return !(__rhs < __lhs);
3915
}
3916
3917
template<class _CharT, class _Traits, class _Allocator>
3918
inline _LIBCPP_INLINE_VISIBILITY
3919
bool
3920
operator<=(const _CharT* __lhs,
3921
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3922
{
3923
    return !(__rhs < __lhs);
3924
}
3925
3926
// operator>=
3927
3928
template<class _CharT, class _Traits, class _Allocator>
3929
inline _LIBCPP_INLINE_VISIBILITY
3930
bool
3931
operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3932
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3933
{
3934
    return !(__lhs < __rhs);
3935
}
3936
3937
template<class _CharT, class _Traits, class _Allocator>
3938
inline _LIBCPP_INLINE_VISIBILITY
3939
bool
3940
operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3941
           const _CharT* __rhs) _NOEXCEPT
3942
{
3943
    return !(__lhs < __rhs);
3944
}
3945
3946
template<class _CharT, class _Traits, class _Allocator>
3947
inline _LIBCPP_INLINE_VISIBILITY
3948
bool
3949
operator>=(const _CharT* __lhs,
3950
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
3951
{
3952
    return !(__lhs < __rhs);
3953
}
3954
3955
// operator +
3956
3957
template<class _CharT, class _Traits, class _Allocator>
3958
basic_string<_CharT, _Traits, _Allocator>
3959
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
3960
          const basic_string<_CharT, _Traits, _Allocator>& __rhs)
3961
{
3962
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
3963
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
3964
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
3965
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + __rhs_sz);
3966
    __r.append(__rhs.data(), __rhs_sz);
3967
    return __r;
3968
}
3969
3970
template<class _CharT, class _Traits, class _Allocator>
3971
basic_string<_CharT, _Traits, _Allocator>
3972
operator+(const _CharT* __lhs , const basic_string<_CharT,_Traits,_Allocator>& __rhs)
3973
{
3974
    basic_string<_CharT, _Traits, _Allocator> __r(__rhs.get_allocator());
3975
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = _Traits::length(__lhs);
3976
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
3977
    __r.__init(__lhs, __lhs_sz, __lhs_sz + __rhs_sz);
3978
    __r.append(__rhs.data(), __rhs_sz);
3979
    return __r;
3980
}
3981
3982
template<class _CharT, class _Traits, class _Allocator>
3983
basic_string<_CharT, _Traits, _Allocator>
3984
operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Allocator>& __rhs)
3985
{
3986
    basic_string<_CharT, _Traits, _Allocator> __r(__rhs.get_allocator());
3987
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
3988
    __r.__init(&__lhs, 1, 1 + __rhs_sz);
3989
    __r.append(__rhs.data(), __rhs_sz);
3990
    return __r;
3991
}
3992
3993
template<class _CharT, class _Traits, class _Allocator>
3994
basic_string<_CharT, _Traits, _Allocator>
3995
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs)
3996
{
3997
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
3998
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
3999
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = _Traits::length(__rhs);
4000
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + __rhs_sz);
4001
    __r.append(__rhs, __rhs_sz);
4002
    return __r;
4003
}
4004
4005
template<class _CharT, class _Traits, class _Allocator>
4006
basic_string<_CharT, _Traits, _Allocator>
4007
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, _CharT __rhs)
4008
{
4009
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
4010
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
4011
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + 1);
4012
    __r.push_back(__rhs);
4013
    return __r;
4014
}
4015
4016
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
4017
4018
template<class _CharT, class _Traits, class _Allocator>
4019
inline _LIBCPP_INLINE_VISIBILITY
4020
basic_string<_CharT, _Traits, _Allocator>
4021
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs)
4022
{
4023
    return _VSTD::move(__lhs.append(__rhs));
4024
}
4025
4026
template<class _CharT, class _Traits, class _Allocator>
4027
inline _LIBCPP_INLINE_VISIBILITY
4028
basic_string<_CharT, _Traits, _Allocator>
4029
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs)
4030
{
4031
    return _VSTD::move(__rhs.insert(0, __lhs));
4032
}
4033
4034
template<class _CharT, class _Traits, class _Allocator>
4035
inline _LIBCPP_INLINE_VISIBILITY
4036
basic_string<_CharT, _Traits, _Allocator>
4037
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs)
4038
{
4039
    return _VSTD::move(__lhs.append(__rhs));
4040
}
4041
4042
template<class _CharT, class _Traits, class _Allocator>
4043
inline _LIBCPP_INLINE_VISIBILITY
4044
basic_string<_CharT, _Traits, _Allocator>
4045
operator+(const _CharT* __lhs , basic_string<_CharT,_Traits,_Allocator>&& __rhs)
4046
{
4047
    return _VSTD::move(__rhs.insert(0, __lhs));
4048
}
4049
4050
template<class _CharT, class _Traits, class _Allocator>
4051
inline _LIBCPP_INLINE_VISIBILITY
4052
basic_string<_CharT, _Traits, _Allocator>
4053
operator+(_CharT __lhs, basic_string<_CharT,_Traits,_Allocator>&& __rhs)
4054
{
4055
    __rhs.insert(__rhs.begin(), __lhs);
4056
    return _VSTD::move(__rhs);
4057
}
4058
4059
template<class _CharT, class _Traits, class _Allocator>
4060
inline _LIBCPP_INLINE_VISIBILITY
4061
basic_string<_CharT, _Traits, _Allocator>
4062
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const _CharT* __rhs)
4063
{
4064
    return _VSTD::move(__lhs.append(__rhs));
4065
}
4066
4067
template<class _CharT, class _Traits, class _Allocator>
4068
inline _LIBCPP_INLINE_VISIBILITY
4069
basic_string<_CharT, _Traits, _Allocator>
4070
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, _CharT __rhs)
4071
{
4072
    __lhs.push_back(__rhs);
4073
    return _VSTD::move(__lhs);
4074
}
4075
4076
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
4077
4078
// swap
4079
4080
template<class _CharT, class _Traits, class _Allocator>
4081
inline _LIBCPP_INLINE_VISIBILITY
4082
void
4083
swap(basic_string<_CharT, _Traits, _Allocator>& __lhs,
4084
     basic_string<_CharT, _Traits, _Allocator>& __rhs)
4085
     _NOEXCEPT_(_NOEXCEPT_(__lhs.swap(__rhs)))
4086
{
4087
    __lhs.swap(__rhs);
4088
}
4089
4090
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
4091
4092
typedef basic_string<char16_t> u16string;
4093
typedef basic_string<char32_t> u32string;
4094
4095
#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
4096
4097
_LIBCPP_FUNC_VIS int                stoi  (const string& __str, size_t* __idx = 0, int __base = 10);
4098
_LIBCPP_FUNC_VIS long               stol  (const string& __str, size_t* __idx = 0, int __base = 10);
4099
_LIBCPP_FUNC_VIS unsigned long      stoul (const string& __str, size_t* __idx = 0, int __base = 10);
4100
_LIBCPP_FUNC_VIS long long          stoll (const string& __str, size_t* __idx = 0, int __base = 10);
4101
_LIBCPP_FUNC_VIS unsigned long long stoull(const string& __str, size_t* __idx = 0, int __base = 10);
4102
4103
_LIBCPP_FUNC_VIS float       stof (const string& __str, size_t* __idx = 0);
4104
_LIBCPP_FUNC_VIS double      stod (const string& __str, size_t* __idx = 0);
4105
_LIBCPP_FUNC_VIS long double stold(const string& __str, size_t* __idx = 0);
4106
4107
_LIBCPP_FUNC_VIS string to_string(int __val);
4108
_LIBCPP_FUNC_VIS string to_string(unsigned __val);
4109
_LIBCPP_FUNC_VIS string to_string(long __val);
4110
_LIBCPP_FUNC_VIS string to_string(unsigned long __val);
4111
_LIBCPP_FUNC_VIS string to_string(long long __val);
4112
_LIBCPP_FUNC_VIS string to_string(unsigned long long __val);
4113
_LIBCPP_FUNC_VIS string to_string(float __val);
4114
_LIBCPP_FUNC_VIS string to_string(double __val);
4115
_LIBCPP_FUNC_VIS string to_string(long double __val);
4116
4117
_LIBCPP_FUNC_VIS int                stoi  (const wstring& __str, size_t* __idx = 0, int __base = 10);
4118
_LIBCPP_FUNC_VIS long               stol  (const wstring& __str, size_t* __idx = 0, int __base = 10);
4119
_LIBCPP_FUNC_VIS unsigned long      stoul (const wstring& __str, size_t* __idx = 0, int __base = 10);
4120
_LIBCPP_FUNC_VIS long long          stoll (const wstring& __str, size_t* __idx = 0, int __base = 10);
4121
_LIBCPP_FUNC_VIS unsigned long long stoull(const wstring& __str, size_t* __idx = 0, int __base = 10);
4122
4123
_LIBCPP_FUNC_VIS float       stof (const wstring& __str, size_t* __idx = 0);
4124
_LIBCPP_FUNC_VIS double      stod (const wstring& __str, size_t* __idx = 0);
4125
_LIBCPP_FUNC_VIS long double stold(const wstring& __str, size_t* __idx = 0);
4126
4127
_LIBCPP_FUNC_VIS wstring to_wstring(int __val);
4128
_LIBCPP_FUNC_VIS wstring to_wstring(unsigned __val);
4129
_LIBCPP_FUNC_VIS wstring to_wstring(long __val);
4130
_LIBCPP_FUNC_VIS wstring to_wstring(unsigned long __val);
4131
_LIBCPP_FUNC_VIS wstring to_wstring(long long __val);
4132
_LIBCPP_FUNC_VIS wstring to_wstring(unsigned long long __val);
4133
_LIBCPP_FUNC_VIS wstring to_wstring(float __val);
4134
_LIBCPP_FUNC_VIS wstring to_wstring(double __val);
4135
_LIBCPP_FUNC_VIS wstring to_wstring(long double __val);
4136
4137
template<class _CharT, class _Traits, class _Allocator>
4138
    const typename basic_string<_CharT, _Traits, _Allocator>::size_type
4139
                   basic_string<_CharT, _Traits, _Allocator>::npos;
4140
4141
template<class _CharT, class _Traits, class _Allocator>
4142
struct _LIBCPP_TYPE_VIS_ONLY hash<basic_string<_CharT, _Traits, _Allocator> >
4143
    : public unary_function<basic_string<_CharT, _Traits, _Allocator>, size_t>
4144
{
4145
    size_t
4146
        operator()(const basic_string<_CharT, _Traits, _Allocator>& __val) const _NOEXCEPT;
4147
};
4148
4149
template<class _CharT, class _Traits, class _Allocator>
4150
size_t
4151
hash<basic_string<_CharT, _Traits, _Allocator> >::operator()(
4152
        const basic_string<_CharT, _Traits, _Allocator>& __val) const _NOEXCEPT
4153
{
4154
    return __do_string_hash(__val.data(), __val.data() + __val.size());
4155
}
4156
4157
template<class _CharT, class _Traits, class _Allocator>
4158
basic_ostream<_CharT, _Traits>&
4159
operator<<(basic_ostream<_CharT, _Traits>& __os,
4160
           const basic_string<_CharT, _Traits, _Allocator>& __str);
4161
4162
template<class _CharT, class _Traits, class _Allocator>
4163
basic_istream<_CharT, _Traits>&
4164
operator>>(basic_istream<_CharT, _Traits>& __is,
4165
           basic_string<_CharT, _Traits, _Allocator>& __str);
4166
4167
template<class _CharT, class _Traits, class _Allocator>
4168
basic_istream<_CharT, _Traits>&
4169
getline(basic_istream<_CharT, _Traits>& __is,
4170
        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);
4171
4172
template<class _CharT, class _Traits, class _Allocator>
4173
inline _LIBCPP_INLINE_VISIBILITY
4174
basic_istream<_CharT, _Traits>&
4175
getline(basic_istream<_CharT, _Traits>& __is,
4176
        basic_string<_CharT, _Traits, _Allocator>& __str);
4177
4178
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
4179
4180
template<class _CharT, class _Traits, class _Allocator>
4181
inline _LIBCPP_INLINE_VISIBILITY
4182
basic_istream<_CharT, _Traits>&
4183
getline(basic_istream<_CharT, _Traits>&& __is,
4184
        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);
4185
4186
template<class _CharT, class _Traits, class _Allocator>
4187
inline _LIBCPP_INLINE_VISIBILITY
4188
basic_istream<_CharT, _Traits>&
4189
getline(basic_istream<_CharT, _Traits>&& __is,
4190
        basic_string<_CharT, _Traits, _Allocator>& __str);
4191
4192
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
4193
4194
#if _LIBCPP_DEBUG_LEVEL >= 2
4195
4196
template<class _CharT, class _Traits, class _Allocator>
4197
bool
4198
basic_string<_CharT, _Traits, _Allocator>::__dereferenceable(const const_iterator* __i) const
4199
{
4200
    return this->data() <= _VSTD::__to_raw_pointer(__i->base()) &&
4201
           _VSTD::__to_raw_pointer(__i->base()) < this->data() + this->size();
4202
}
4203
4204
template<class _CharT, class _Traits, class _Allocator>
4205
bool
4206
basic_string<_CharT, _Traits, _Allocator>::__decrementable(const const_iterator* __i) const
4207
{
4208
    return this->data() < _VSTD::__to_raw_pointer(__i->base()) &&
4209
           _VSTD::__to_raw_pointer(__i->base()) <= this->data() + this->size();
4210
}
4211
4212
template<class _CharT, class _Traits, class _Allocator>
4213
bool
4214
basic_string<_CharT, _Traits, _Allocator>::__addable(const const_iterator* __i, ptrdiff_t __n) const
4215
{
4216
    const value_type* __p = _VSTD::__to_raw_pointer(__i->base()) + __n;
4217
    return this->data() <= __p && __p <= this->data() + this->size();
4218
}
4219
4220
template<class _CharT, class _Traits, class _Allocator>
4221
bool
4222
basic_string<_CharT, _Traits, _Allocator>::__subscriptable(const const_iterator* __i, ptrdiff_t __n) const
4223
{
4224
    const value_type* __p = _VSTD::__to_raw_pointer(__i->base()) + __n;
4225
    return this->data() <= __p && __p < this->data() + this->size();
4226
}
4227
4228
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
4229
4230
#if _LIBCPP_STD_VER > 11
4231
// Literal suffixes for basic_string [basic.string.literals]
4232
inline namespace literals
4233
{
4234
  inline namespace string_literals
4235
  {
4236
    inline _LIBCPP_INLINE_VISIBILITY
4237
    basic_string<char> operator "" s( const char *__str, size_t __len )
4238
    {
4239
        return basic_string<char> (__str, __len);
4240
    }
4241
4242
    inline _LIBCPP_INLINE_VISIBILITY
4243
    basic_string<wchar_t> operator "" s( const wchar_t *__str, size_t __len )
4244
    {
4245
        return basic_string<wchar_t> (__str, __len);
4246
    }
4247
4248
    inline _LIBCPP_INLINE_VISIBILITY
4249
    basic_string<char16_t> operator "" s( const char16_t *__str, size_t __len )
4250
    {
4251
        return basic_string<char16_t> (__str, __len);
4252
    }
4253
4254
    inline _LIBCPP_INLINE_VISIBILITY
4255
    basic_string<char32_t> operator "" s( const char32_t *__str, size_t __len )
4256
    {
4257
        return basic_string<char32_t> (__str, __len);
4258
    }
4259
  }
4260
}
4261
#endif
4262
4263
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_string<char>)
4264
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_string<wchar_t>)
4265
_LIBCPP_EXTERN_TEMPLATE(string operator+<char, char_traits<char>, allocator<char> >(char const*, string const&))
4266
4267
_LIBCPP_END_NAMESPACE_STD
4268
4269
#endif  // _LIBCPP_STRING