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| 1 | 13 | up20180614 | // -*- C++ -*- |
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| 2 | //===-------------------------- optional ----------------------------------===// |
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| 3 | // |
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| 4 | // The LLVM Compiler Infrastructure |
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| 5 | // |
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| 6 | // This file is dual licensed under the MIT and the University of Illinois Open |
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| 7 | // Source Licenses. See LICENSE.TXT for details. |
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| 8 | // |
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| 9 | //===----------------------------------------------------------------------===// |
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| 10 | |||
| 11 | #ifndef _LIBCPP_OPTIONAL |
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| 12 | #define _LIBCPP_OPTIONAL |
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| 13 | |||
| 14 | /* |
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| 15 | optional synopsis |
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| 16 | |||
| 17 | // C++1y |
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| 18 | |||
| 19 | namespace std { namespace experimental { inline namespace fundamentals_v1 {
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| 20 | |||
| 21 | // 5.3, optional for object types |
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| 22 | template <class T> class optional; |
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| 23 | |||
| 24 | // 5.4, In-place construction |
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| 25 | struct in_place_t{};
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| 26 | constexpr in_place_t in_place{};
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| 27 | |||
| 28 | // 5.5, No-value state indicator |
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| 29 | struct nullopt_t{see below};
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| 30 | constexpr nullopt_t nullopt(unspecified); |
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| 31 | |||
| 32 | // 5.6, Class bad_optional_access |
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| 33 | class bad_optional_access; |
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| 34 | |||
| 35 | // 5.7, Relational operators |
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| 36 | template <class T> |
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| 37 | constexpr bool operator==(const optional<T>&, const optional<T>&); |
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| 38 | template <class T> |
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| 39 | constexpr bool operator!=(const optional<T>&, const optional<T>&); |
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| 40 | template <class T> |
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| 41 | constexpr bool operator<(const optional<T>&, const optional<T>&); |
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| 42 | template <class T> |
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| 43 | constexpr bool operator>(const optional<T>&, const optional<T>&); |
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| 44 | template <class T> |
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| 45 | constexpr bool operator<=(const optional<T>&, const optional<T>&); |
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| 46 | template <class T> |
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| 47 | constexpr bool operator>=(const optional<T>&, const optional<T>&); |
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| 48 | |||
| 49 | // 5.8, Comparison with nullopt |
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| 50 | template <class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept; |
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| 51 | template <class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept; |
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| 52 | template <class T> constexpr bool operator!=(const optional<T>&, nullopt_t) noexcept; |
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| 53 | template <class T> constexpr bool operator!=(nullopt_t, const optional<T>&) noexcept; |
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| 54 | template <class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept; |
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| 55 | template <class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept; |
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| 56 | template <class T> constexpr bool operator<=(const optional<T>&, nullopt_t) noexcept; |
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| 57 | template <class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept; |
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| 58 | template <class T> constexpr bool operator>(const optional<T>&, nullopt_t) noexcept; |
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| 59 | template <class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept; |
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| 60 | template <class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept; |
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| 61 | template <class T> constexpr bool operator>=(nullopt_t, const optional<T>&) noexcept; |
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| 62 | |||
| 63 | // 5.9, Comparison with T |
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| 64 | template <class T> constexpr bool operator==(const optional<T>&, const T&); |
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| 65 | template <class T> constexpr bool operator==(const T&, const optional<T>&); |
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| 66 | template <class T> constexpr bool operator!=(const optional<T>&, const T&); |
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| 67 | template <class T> constexpr bool operator!=(const T&, const optional<T>&); |
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| 68 | template <class T> constexpr bool operator<(const optional<T>&, const T&); |
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| 69 | template <class T> constexpr bool operator<(const T&, const optional<T>&); |
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| 70 | template <class T> constexpr bool operator<=(const optional<T>&, const T&); |
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| 71 | template <class T> constexpr bool operator<=(const T&, const optional<T>&); |
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| 72 | template <class T> constexpr bool operator>(const optional<T>&, const T&); |
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| 73 | template <class T> constexpr bool operator>(const T&, const optional<T>&); |
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| 74 | template <class T> constexpr bool operator>=(const optional<T>&, const T&); |
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| 75 | template <class T> constexpr bool operator>=(const T&, const optional<T>&); |
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| 76 | |||
| 77 | // 5.10, Specialized algorithms |
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| 78 | template <class T> void swap(optional<T>&, optional<T>&) noexcept(see below); |
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| 79 | template <class T> constexpr optional<see below> make_optional(T&&); |
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| 80 | |||
| 81 | template <class T> |
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| 82 | class optional |
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| 83 | {
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| 84 | public: |
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| 85 | typedef T value_type; |
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| 86 | |||
| 87 | // 5.3.1, Constructors |
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| 88 | constexpr optional() noexcept; |
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| 89 | constexpr optional(nullopt_t) noexcept; |
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| 90 | optional(const optional&); |
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| 91 | optional(optional&&) noexcept(see below); |
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| 92 | constexpr optional(const T&); |
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| 93 | constexpr optional(T&&); |
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| 94 | template <class... Args> constexpr explicit optional(in_place_t, Args&&...); |
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| 95 | template <class U, class... Args> |
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| 96 | constexpr explicit optional(in_place_t, initializer_list<U>, Args&&...); |
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| 97 | |||
| 98 | // 5.3.2, Destructor |
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| 99 | ~optional(); |
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| 100 | |||
| 101 | // 5.3.3, Assignment |
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| 102 | optional& operator=(nullopt_t) noexcept; |
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| 103 | optional& operator=(const optional&); |
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| 104 | optional& operator=(optional&&) noexcept(see below); |
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| 105 | template <class U> optional& operator=(U&&); |
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| 106 | template <class... Args> void emplace(Args&&...); |
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| 107 | template <class U, class... Args> |
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| 108 | void emplace(initializer_list<U>, Args&&...); |
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| 109 | |||
| 110 | // 5.3.4, Swap |
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| 111 | void swap(optional&) noexcept(see below); |
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| 112 | |||
| 113 | // 5.3.5, Observers |
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| 114 | constexpr T const* operator ->() const; |
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| 115 | constexpr T* operator ->(); |
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| 116 | constexpr T const& operator *() const &; |
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| 117 | constexpr T& operator *() &; |
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| 118 | constexpr T&& operator *() &&; |
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| 119 | constexpr const T&& operator *() const &&; |
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| 120 | constexpr explicit operator bool() const noexcept; |
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| 121 | constexpr T const& value() const &; |
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| 122 | constexpr T& value() &; |
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| 123 | constexpr T&& value() &&; |
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| 124 | constexpr const T&& value() const &&; |
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| 125 | template <class U> constexpr T value_or(U&&) const &; |
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| 126 | template <class U> constexpr T value_or(U&&) &&; |
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| 127 | |||
| 128 | private: |
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| 129 | T* val; // exposition only |
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| 130 | }; |
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| 131 | |||
| 132 | } // namespace fundamentals_v1 |
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| 133 | } // namespace experimental |
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| 134 | |||
| 135 | // 5.11, Hash support |
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| 136 | template <class T> struct hash; |
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| 137 | template <class T> struct hash<experimental::optional<T>>; |
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| 138 | |||
| 139 | } // namespace std |
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| 140 | |||
| 141 | */ |
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| 142 | |||
| 143 | #include <experimental/__config> |
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| 144 | #include <functional> |
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| 145 | #include <stdexcept> |
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| 146 | |||
| 147 | _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL |
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| 148 | class _LIBCPP_EXCEPTION_ABI bad_optional_access |
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| 149 | : public std::logic_error |
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| 150 | {
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| 151 | public: |
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| 152 | bad_optional_access() : std::logic_error("Bad optional Access") {}
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| 153 | |||
| 154 | // Get the key function ~bad_optional_access() into the dylib |
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| 155 | virtual ~bad_optional_access() _NOEXCEPT; |
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| 156 | }; |
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| 157 | |||
| 158 | _LIBCPP_END_NAMESPACE_EXPERIMENTAL |
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| 159 | |||
| 160 | |||
| 161 | #if _LIBCPP_STD_VER > 11 |
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| 162 | |||
| 163 | #include <initializer_list> |
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| 164 | #include <type_traits> |
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| 165 | #include <new> |
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| 166 | #include <__functional_base> |
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| 167 | #include <__undef_min_max> |
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| 168 | #include <__debug> |
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| 169 | |||
| 170 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
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| 171 | #pragma GCC system_header |
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| 172 | #endif |
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| 173 | |||
| 174 | _LIBCPP_BEGIN_NAMESPACE_LFTS |
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| 175 | |||
| 176 | struct in_place_t {};
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| 177 | constexpr in_place_t in_place{};
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| 178 | |||
| 179 | struct nullopt_t |
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| 180 | {
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| 181 | explicit constexpr nullopt_t(int) noexcept {}
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| 182 | }; |
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| 183 | |||
| 184 | constexpr nullopt_t nullopt{0};
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| 185 | |||
| 186 | template <class _Tp, bool = is_trivially_destructible<_Tp>::value> |
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| 187 | class __optional_storage |
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| 188 | {
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| 189 | protected: |
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| 190 | typedef _Tp value_type; |
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| 191 | union |
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| 192 | {
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| 193 | char __null_state_; |
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| 194 | value_type __val_; |
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| 195 | }; |
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| 196 | bool __engaged_ = false; |
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| 197 | |||
| 198 | _LIBCPP_INLINE_VISIBILITY |
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| 199 | ~__optional_storage() |
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| 200 | {
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| 201 | if (__engaged_) |
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| 202 | __val_.~value_type(); |
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| 203 | } |
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| 204 | |||
| 205 | _LIBCPP_INLINE_VISIBILITY |
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| 206 | constexpr __optional_storage() noexcept |
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| 207 | : __null_state_('\0') {}
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| 208 | |||
| 209 | _LIBCPP_INLINE_VISIBILITY |
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| 210 | __optional_storage(const __optional_storage& __x) |
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| 211 | : __engaged_(__x.__engaged_) |
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| 212 | {
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| 213 | if (__engaged_) |
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| 214 | ::new(_VSTD::addressof(__val_)) value_type(__x.__val_); |
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| 215 | } |
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| 216 | |||
| 217 | _LIBCPP_INLINE_VISIBILITY |
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| 218 | __optional_storage(__optional_storage&& __x) |
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| 219 | noexcept(is_nothrow_move_constructible<value_type>::value) |
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| 220 | : __engaged_(__x.__engaged_) |
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| 221 | {
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| 222 | if (__engaged_) |
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| 223 | ::new(_VSTD::addressof(__val_)) value_type(_VSTD::move(__x.__val_)); |
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| 224 | } |
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| 225 | |||
| 226 | _LIBCPP_INLINE_VISIBILITY |
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| 227 | constexpr __optional_storage(const value_type& __v) |
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| 228 | : __val_(__v), |
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| 229 | __engaged_(true) {}
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| 230 | |||
| 231 | _LIBCPP_INLINE_VISIBILITY |
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| 232 | constexpr __optional_storage(value_type&& __v) |
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| 233 | : __val_(_VSTD::move(__v)), |
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| 234 | __engaged_(true) {}
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| 235 | |||
| 236 | template <class... _Args> |
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| 237 | _LIBCPP_INLINE_VISIBILITY |
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| 238 | constexpr |
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| 239 | explicit __optional_storage(in_place_t, _Args&&... __args) |
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| 240 | : __val_(_VSTD::forward<_Args>(__args)...), |
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| 241 | __engaged_(true) {}
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| 242 | }; |
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| 243 | |||
| 244 | template <class _Tp> |
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| 245 | class __optional_storage<_Tp, true> |
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| 246 | {
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| 247 | protected: |
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| 248 | typedef _Tp value_type; |
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| 249 | union |
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| 250 | {
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| 251 | char __null_state_; |
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| 252 | value_type __val_; |
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| 253 | }; |
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| 254 | bool __engaged_ = false; |
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| 255 | |||
| 256 | _LIBCPP_INLINE_VISIBILITY |
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| 257 | constexpr __optional_storage() noexcept |
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| 258 | : __null_state_('\0') {}
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| 259 | |||
| 260 | _LIBCPP_INLINE_VISIBILITY |
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| 261 | __optional_storage(const __optional_storage& __x) |
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| 262 | : __engaged_(__x.__engaged_) |
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| 263 | {
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| 264 | if (__engaged_) |
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| 265 | ::new(_VSTD::addressof(__val_)) value_type(__x.__val_); |
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| 266 | } |
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| 267 | |||
| 268 | _LIBCPP_INLINE_VISIBILITY |
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| 269 | __optional_storage(__optional_storage&& __x) |
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| 270 | noexcept(is_nothrow_move_constructible<value_type>::value) |
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| 271 | : __engaged_(__x.__engaged_) |
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| 272 | {
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| 273 | if (__engaged_) |
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| 274 | ::new(_VSTD::addressof(__val_)) value_type(_VSTD::move(__x.__val_)); |
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| 275 | } |
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| 276 | |||
| 277 | _LIBCPP_INLINE_VISIBILITY |
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| 278 | constexpr __optional_storage(const value_type& __v) |
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| 279 | : __val_(__v), |
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| 280 | __engaged_(true) {}
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| 281 | |||
| 282 | _LIBCPP_INLINE_VISIBILITY |
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| 283 | constexpr __optional_storage(value_type&& __v) |
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| 284 | : __val_(_VSTD::move(__v)), |
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| 285 | __engaged_(true) {}
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| 286 | |||
| 287 | template <class... _Args> |
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| 288 | _LIBCPP_INLINE_VISIBILITY |
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| 289 | constexpr |
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| 290 | explicit __optional_storage(in_place_t, _Args&&... __args) |
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| 291 | : __val_(_VSTD::forward<_Args>(__args)...), |
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| 292 | __engaged_(true) {}
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| 293 | }; |
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| 294 | |||
| 295 | template <class _Tp> |
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| 296 | class optional |
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| 297 | : private __optional_storage<_Tp> |
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| 298 | {
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| 299 | typedef __optional_storage<_Tp> __base; |
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| 300 | public: |
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| 301 | typedef _Tp value_type; |
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| 302 | |||
| 303 | static_assert(!is_reference<value_type>::value, |
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| 304 | "Instantiation of optional with a reference type is ill-formed."); |
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| 305 | static_assert(!is_same<typename remove_cv<value_type>::type, in_place_t>::value, |
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| 306 | "Instantiation of optional with a in_place_t type is ill-formed."); |
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| 307 | static_assert(!is_same<typename remove_cv<value_type>::type, nullopt_t>::value, |
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| 308 | "Instantiation of optional with a nullopt_t type is ill-formed."); |
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| 309 | static_assert(is_object<value_type>::value, |
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| 310 | "Instantiation of optional with a non-object type is undefined behavior."); |
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| 311 | static_assert(is_nothrow_destructible<value_type>::value, |
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| 312 | "Instantiation of optional with an object type that is not noexcept destructible is undefined behavior."); |
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| 313 | |||
| 314 | _LIBCPP_INLINE_VISIBILITY constexpr optional() noexcept {}
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| 315 | _LIBCPP_INLINE_VISIBILITY optional(const optional&) = default; |
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| 316 | _LIBCPP_INLINE_VISIBILITY optional(optional&&) = default; |
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| 317 | _LIBCPP_INLINE_VISIBILITY ~optional() = default; |
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| 318 | _LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {}
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| 319 | _LIBCPP_INLINE_VISIBILITY constexpr optional(const value_type& __v) |
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| 320 | : __base(__v) {}
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| 321 | _LIBCPP_INLINE_VISIBILITY constexpr optional(value_type&& __v) |
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| 322 | : __base(_VSTD::move(__v)) {}
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| 323 | |||
| 324 | template <class... _Args, |
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| 325 | class = typename enable_if |
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| 326 | < |
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| 327 | is_constructible<value_type, _Args...>::value |
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| 328 | >::type |
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| 329 | > |
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| 330 | _LIBCPP_INLINE_VISIBILITY |
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| 331 | constexpr |
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| 332 | explicit optional(in_place_t, _Args&&... __args) |
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| 333 | : __base(in_place, _VSTD::forward<_Args>(__args)...) {}
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| 334 | |||
| 335 | template <class _Up, class... _Args, |
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| 336 | class = typename enable_if |
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| 337 | < |
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| 338 | is_constructible<value_type, initializer_list<_Up>&, _Args...>::value |
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| 339 | >::type |
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| 340 | > |
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| 341 | _LIBCPP_INLINE_VISIBILITY |
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| 342 | constexpr |
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| 343 | explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args) |
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| 344 | : __base(in_place, __il, _VSTD::forward<_Args>(__args)...) {}
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| 345 | |||
| 346 | _LIBCPP_INLINE_VISIBILITY |
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| 347 | optional& operator=(nullopt_t) noexcept |
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| 348 | {
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| 349 | if (this->__engaged_) |
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| 350 | {
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| 351 | this->__val_.~value_type(); |
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| 352 | this->__engaged_ = false; |
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| 353 | } |
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| 354 | return *this; |
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| 355 | } |
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| 356 | |||
| 357 | _LIBCPP_INLINE_VISIBILITY |
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| 358 | optional& |
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| 359 | operator=(const optional& __opt) |
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| 360 | {
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| 361 | if (this->__engaged_ == __opt.__engaged_) |
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| 362 | {
|
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| 363 | if (this->__engaged_) |
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| 364 | this->__val_ = __opt.__val_; |
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| 365 | } |
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| 366 | else |
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| 367 | {
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| 368 | if (this->__engaged_) |
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| 369 | this->__val_.~value_type(); |
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| 370 | else |
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| 371 | ::new(_VSTD::addressof(this->__val_)) value_type(__opt.__val_); |
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| 372 | this->__engaged_ = __opt.__engaged_; |
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| 373 | } |
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| 374 | return *this; |
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| 375 | } |
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| 376 | |||
| 377 | _LIBCPP_INLINE_VISIBILITY |
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| 378 | optional& |
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| 379 | operator=(optional&& __opt) |
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| 380 | noexcept(is_nothrow_move_assignable<value_type>::value && |
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| 381 | is_nothrow_move_constructible<value_type>::value) |
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| 382 | {
|
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| 383 | if (this->__engaged_ == __opt.__engaged_) |
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| 384 | {
|
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| 385 | if (this->__engaged_) |
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| 386 | this->__val_ = _VSTD::move(__opt.__val_); |
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| 387 | } |
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| 388 | else |
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| 389 | {
|
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| 390 | if (this->__engaged_) |
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| 391 | this->__val_.~value_type(); |
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| 392 | else |
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| 393 | ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::move(__opt.__val_)); |
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| 394 | this->__engaged_ = __opt.__engaged_; |
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| 395 | } |
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| 396 | return *this; |
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| 397 | } |
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| 398 | |||
| 399 | template <class _Up, |
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| 400 | class = typename enable_if |
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| 401 | < |
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| 402 | is_same<typename remove_reference<_Up>::type, value_type>::value && |
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| 403 | is_constructible<value_type, _Up>::value && |
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| 404 | is_assignable<value_type&, _Up>::value |
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| 405 | >::type |
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| 406 | > |
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| 407 | _LIBCPP_INLINE_VISIBILITY |
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| 408 | optional& |
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| 409 | operator=(_Up&& __v) |
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| 410 | {
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| 411 | if (this->__engaged_) |
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| 412 | this->__val_ = _VSTD::forward<_Up>(__v); |
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| 413 | else |
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| 414 | {
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| 415 | ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Up>(__v)); |
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| 416 | this->__engaged_ = true; |
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| 417 | } |
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| 418 | return *this; |
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| 419 | } |
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| 420 | |||
| 421 | template <class... _Args, |
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| 422 | class = typename enable_if |
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| 423 | < |
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| 424 | is_constructible<value_type, _Args...>::value |
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| 425 | >::type |
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| 426 | > |
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| 427 | _LIBCPP_INLINE_VISIBILITY |
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| 428 | void |
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| 429 | emplace(_Args&&... __args) |
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| 430 | {
|
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| 431 | *this = nullopt; |
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| 432 | ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...); |
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| 433 | this->__engaged_ = true; |
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| 434 | } |
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| 435 | |||
| 436 | template <class _Up, class... _Args, |
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| 437 | class = typename enable_if |
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| 438 | < |
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| 439 | is_constructible<value_type, initializer_list<_Up>&, _Args...>::value |
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| 440 | >::type |
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| 441 | > |
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| 442 | _LIBCPP_INLINE_VISIBILITY |
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| 443 | void |
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| 444 | emplace(initializer_list<_Up> __il, _Args&&... __args) |
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| 445 | {
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| 446 | *this = nullopt; |
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| 447 | ::new(_VSTD::addressof(this->__val_)) value_type(__il, _VSTD::forward<_Args>(__args)...); |
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| 448 | this->__engaged_ = true; |
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| 449 | } |
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| 450 | |||
| 451 | _LIBCPP_INLINE_VISIBILITY |
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| 452 | void |
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| 453 | swap(optional& __opt) |
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| 454 | noexcept(is_nothrow_move_constructible<value_type>::value && |
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| 455 | __is_nothrow_swappable<value_type>::value) |
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| 456 | {
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| 457 | using _VSTD::swap; |
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| 458 | if (this->__engaged_ == __opt.__engaged_) |
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| 459 | {
|
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| 460 | if (this->__engaged_) |
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| 461 | swap(this->__val_, __opt.__val_); |
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| 462 | } |
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| 463 | else |
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| 464 | {
|
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| 465 | if (this->__engaged_) |
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| 466 | {
|
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| 467 | ::new(_VSTD::addressof(__opt.__val_)) value_type(_VSTD::move(this->__val_)); |
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| 468 | this->__val_.~value_type(); |
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| 469 | } |
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| 470 | else |
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| 471 | {
|
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| 472 | ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::move(__opt.__val_)); |
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| 473 | __opt.__val_.~value_type(); |
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| 474 | } |
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| 475 | swap(this->__engaged_, __opt.__engaged_); |
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| 476 | } |
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| 477 | } |
||
| 478 | |||
| 479 | _LIBCPP_INLINE_VISIBILITY |
||
| 480 | constexpr |
||
| 481 | value_type const* |
||
| 482 | operator->() const |
||
| 483 | {
|
||
| 484 | _LIBCPP_ASSERT(this->__engaged_, "optional operator-> called for disengaged value"); |
||
| 485 | return __operator_arrow(__has_operator_addressof<value_type>{});
|
||
| 486 | } |
||
| 487 | |||
| 488 | _LIBCPP_INLINE_VISIBILITY |
||
| 489 | value_type* |
||
| 490 | operator->() |
||
| 491 | {
|
||
| 492 | _LIBCPP_ASSERT(this->__engaged_, "optional operator-> called for disengaged value"); |
||
| 493 | return _VSTD::addressof(this->__val_); |
||
| 494 | } |
||
| 495 | |||
| 496 | _LIBCPP_INLINE_VISIBILITY |
||
| 497 | constexpr |
||
| 498 | const value_type& |
||
| 499 | operator*() const |
||
| 500 | {
|
||
| 501 | _LIBCPP_ASSERT(this->__engaged_, "optional operator* called for disengaged value"); |
||
| 502 | return this->__val_; |
||
| 503 | } |
||
| 504 | |||
| 505 | _LIBCPP_INLINE_VISIBILITY |
||
| 506 | value_type& |
||
| 507 | operator*() |
||
| 508 | {
|
||
| 509 | _LIBCPP_ASSERT(this->__engaged_, "optional operator* called for disengaged value"); |
||
| 510 | return this->__val_; |
||
| 511 | } |
||
| 512 | |||
| 513 | _LIBCPP_INLINE_VISIBILITY |
||
| 514 | constexpr explicit operator bool() const noexcept {return this->__engaged_;}
|
||
| 515 | |||
| 516 | _LIBCPP_INLINE_VISIBILITY |
||
| 517 | constexpr value_type const& value() const |
||
| 518 | {
|
||
| 519 | if (!this->__engaged_) |
||
| 520 | throw bad_optional_access(); |
||
| 521 | return this->__val_; |
||
| 522 | } |
||
| 523 | |||
| 524 | _LIBCPP_INLINE_VISIBILITY |
||
| 525 | value_type& value() |
||
| 526 | {
|
||
| 527 | if (!this->__engaged_) |
||
| 528 | throw bad_optional_access(); |
||
| 529 | return this->__val_; |
||
| 530 | } |
||
| 531 | |||
| 532 | template <class _Up> |
||
| 533 | _LIBCPP_INLINE_VISIBILITY |
||
| 534 | constexpr value_type value_or(_Up&& __v) const& |
||
| 535 | {
|
||
| 536 | static_assert(is_copy_constructible<value_type>::value, |
||
| 537 | "optional<T>::value_or: T must be copy constructible"); |
||
| 538 | static_assert(is_convertible<_Up, value_type>::value, |
||
| 539 | "optional<T>::value_or: U must be convertible to T"); |
||
| 540 | return this->__engaged_ ? this->__val_ : |
||
| 541 | static_cast<value_type>(_VSTD::forward<_Up>(__v)); |
||
| 542 | } |
||
| 543 | |||
| 544 | template <class _Up> |
||
| 545 | _LIBCPP_INLINE_VISIBILITY |
||
| 546 | value_type value_or(_Up&& __v) && |
||
| 547 | {
|
||
| 548 | static_assert(is_move_constructible<value_type>::value, |
||
| 549 | "optional<T>::value_or: T must be move constructible"); |
||
| 550 | static_assert(is_convertible<_Up, value_type>::value, |
||
| 551 | "optional<T>::value_or: U must be convertible to T"); |
||
| 552 | return this->__engaged_ ? _VSTD::move(this->__val_) : |
||
| 553 | static_cast<value_type>(_VSTD::forward<_Up>(__v)); |
||
| 554 | } |
||
| 555 | |||
| 556 | private: |
||
| 557 | _LIBCPP_INLINE_VISIBILITY |
||
| 558 | value_type const* |
||
| 559 | __operator_arrow(true_type) const |
||
| 560 | {
|
||
| 561 | return _VSTD::addressof(this->__val_); |
||
| 562 | } |
||
| 563 | |||
| 564 | _LIBCPP_INLINE_VISIBILITY |
||
| 565 | constexpr |
||
| 566 | value_type const* |
||
| 567 | __operator_arrow(false_type) const |
||
| 568 | {
|
||
| 569 | return &this->__val_; |
||
| 570 | } |
||
| 571 | }; |
||
| 572 | |||
| 573 | // Comparisons between optionals |
||
| 574 | template <class _Tp> |
||
| 575 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 576 | constexpr |
||
| 577 | bool |
||
| 578 | operator==(const optional<_Tp>& __x, const optional<_Tp>& __y) |
||
| 579 | {
|
||
| 580 | if (static_cast<bool>(__x) != static_cast<bool>(__y)) |
||
| 581 | return false; |
||
| 582 | if (!static_cast<bool>(__x)) |
||
| 583 | return true; |
||
| 584 | return *__x == *__y; |
||
| 585 | } |
||
| 586 | |||
| 587 | template <class _Tp> |
||
| 588 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 589 | constexpr |
||
| 590 | bool |
||
| 591 | operator!=(const optional<_Tp>& __x, const optional<_Tp>& __y) |
||
| 592 | {
|
||
| 593 | return !(__x == __y); |
||
| 594 | } |
||
| 595 | |||
| 596 | template <class _Tp> |
||
| 597 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 598 | constexpr |
||
| 599 | bool |
||
| 600 | operator<(const optional<_Tp>& __x, const optional<_Tp>& __y) |
||
| 601 | {
|
||
| 602 | if (!static_cast<bool>(__y)) |
||
| 603 | return false; |
||
| 604 | if (!static_cast<bool>(__x)) |
||
| 605 | return true; |
||
| 606 | return *__x < *__y; |
||
| 607 | } |
||
| 608 | |||
| 609 | template <class _Tp> |
||
| 610 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 611 | constexpr |
||
| 612 | bool |
||
| 613 | operator>(const optional<_Tp>& __x, const optional<_Tp>& __y) |
||
| 614 | {
|
||
| 615 | return __y < __x; |
||
| 616 | } |
||
| 617 | |||
| 618 | template <class _Tp> |
||
| 619 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 620 | constexpr |
||
| 621 | bool |
||
| 622 | operator<=(const optional<_Tp>& __x, const optional<_Tp>& __y) |
||
| 623 | {
|
||
| 624 | return !(__y < __x); |
||
| 625 | } |
||
| 626 | |||
| 627 | template <class _Tp> |
||
| 628 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 629 | constexpr |
||
| 630 | bool |
||
| 631 | operator>=(const optional<_Tp>& __x, const optional<_Tp>& __y) |
||
| 632 | {
|
||
| 633 | return !(__x < __y); |
||
| 634 | } |
||
| 635 | |||
| 636 | |||
| 637 | // Comparisons with nullopt |
||
| 638 | template <class _Tp> |
||
| 639 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 640 | constexpr |
||
| 641 | bool |
||
| 642 | operator==(const optional<_Tp>& __x, nullopt_t) noexcept |
||
| 643 | {
|
||
| 644 | return !static_cast<bool>(__x); |
||
| 645 | } |
||
| 646 | |||
| 647 | template <class _Tp> |
||
| 648 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 649 | constexpr |
||
| 650 | bool |
||
| 651 | operator==(nullopt_t, const optional<_Tp>& __x) noexcept |
||
| 652 | {
|
||
| 653 | return !static_cast<bool>(__x); |
||
| 654 | } |
||
| 655 | |||
| 656 | template <class _Tp> |
||
| 657 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 658 | constexpr |
||
| 659 | bool |
||
| 660 | operator!=(const optional<_Tp>& __x, nullopt_t) noexcept |
||
| 661 | {
|
||
| 662 | return static_cast<bool>(__x); |
||
| 663 | } |
||
| 664 | |||
| 665 | template <class _Tp> |
||
| 666 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 667 | constexpr |
||
| 668 | bool |
||
| 669 | operator!=(nullopt_t, const optional<_Tp>& __x) noexcept |
||
| 670 | {
|
||
| 671 | return static_cast<bool>(__x); |
||
| 672 | } |
||
| 673 | |||
| 674 | template <class _Tp> |
||
| 675 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 676 | constexpr |
||
| 677 | bool |
||
| 678 | operator<(const optional<_Tp>&, nullopt_t) noexcept |
||
| 679 | {
|
||
| 680 | return false; |
||
| 681 | } |
||
| 682 | |||
| 683 | template <class _Tp> |
||
| 684 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 685 | constexpr |
||
| 686 | bool |
||
| 687 | operator<(nullopt_t, const optional<_Tp>& __x) noexcept |
||
| 688 | {
|
||
| 689 | return static_cast<bool>(__x); |
||
| 690 | } |
||
| 691 | |||
| 692 | template <class _Tp> |
||
| 693 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 694 | constexpr |
||
| 695 | bool |
||
| 696 | operator<=(const optional<_Tp>& __x, nullopt_t) noexcept |
||
| 697 | {
|
||
| 698 | return !static_cast<bool>(__x); |
||
| 699 | } |
||
| 700 | |||
| 701 | template <class _Tp> |
||
| 702 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 703 | constexpr |
||
| 704 | bool |
||
| 705 | operator<=(nullopt_t, const optional<_Tp>& __x) noexcept |
||
| 706 | {
|
||
| 707 | return true; |
||
| 708 | } |
||
| 709 | |||
| 710 | template <class _Tp> |
||
| 711 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 712 | constexpr |
||
| 713 | bool |
||
| 714 | operator>(const optional<_Tp>& __x, nullopt_t) noexcept |
||
| 715 | {
|
||
| 716 | return static_cast<bool>(__x); |
||
| 717 | } |
||
| 718 | |||
| 719 | template <class _Tp> |
||
| 720 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 721 | constexpr |
||
| 722 | bool |
||
| 723 | operator>(nullopt_t, const optional<_Tp>& __x) noexcept |
||
| 724 | {
|
||
| 725 | return false; |
||
| 726 | } |
||
| 727 | |||
| 728 | template <class _Tp> |
||
| 729 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 730 | constexpr |
||
| 731 | bool |
||
| 732 | operator>=(const optional<_Tp>&, nullopt_t) noexcept |
||
| 733 | {
|
||
| 734 | return true; |
||
| 735 | } |
||
| 736 | |||
| 737 | template <class _Tp> |
||
| 738 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 739 | constexpr |
||
| 740 | bool |
||
| 741 | operator>=(nullopt_t, const optional<_Tp>& __x) noexcept |
||
| 742 | {
|
||
| 743 | return !static_cast<bool>(__x); |
||
| 744 | } |
||
| 745 | |||
| 746 | // Comparisons with T |
||
| 747 | template <class _Tp> |
||
| 748 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 749 | constexpr |
||
| 750 | bool |
||
| 751 | operator==(const optional<_Tp>& __x, const _Tp& __v) |
||
| 752 | {
|
||
| 753 | return static_cast<bool>(__x) ? *__x == __v : false; |
||
| 754 | } |
||
| 755 | |||
| 756 | template <class _Tp> |
||
| 757 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 758 | constexpr |
||
| 759 | bool |
||
| 760 | operator==(const _Tp& __v, const optional<_Tp>& __x) |
||
| 761 | {
|
||
| 762 | return static_cast<bool>(__x) ? *__x == __v : false; |
||
| 763 | } |
||
| 764 | |||
| 765 | template <class _Tp> |
||
| 766 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 767 | constexpr |
||
| 768 | bool |
||
| 769 | operator!=(const optional<_Tp>& __x, const _Tp& __v) |
||
| 770 | {
|
||
| 771 | return static_cast<bool>(__x) ? !(*__x == __v) : true; |
||
| 772 | } |
||
| 773 | |||
| 774 | template <class _Tp> |
||
| 775 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 776 | constexpr |
||
| 777 | bool |
||
| 778 | operator!=(const _Tp& __v, const optional<_Tp>& __x) |
||
| 779 | {
|
||
| 780 | return static_cast<bool>(__x) ? !(*__x == __v) : true; |
||
| 781 | } |
||
| 782 | |||
| 783 | template <class _Tp> |
||
| 784 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 785 | constexpr |
||
| 786 | bool |
||
| 787 | operator<(const optional<_Tp>& __x, const _Tp& __v) |
||
| 788 | {
|
||
| 789 | return static_cast<bool>(__x) ? less<_Tp>{}(*__x, __v) : true;
|
||
| 790 | } |
||
| 791 | |||
| 792 | template <class _Tp> |
||
| 793 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 794 | constexpr |
||
| 795 | bool |
||
| 796 | operator<(const _Tp& __v, const optional<_Tp>& __x) |
||
| 797 | {
|
||
| 798 | return static_cast<bool>(__x) ? less<_Tp>{}(__v, *__x) : false;
|
||
| 799 | } |
||
| 800 | |||
| 801 | template <class _Tp> |
||
| 802 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 803 | constexpr |
||
| 804 | bool |
||
| 805 | operator<=(const optional<_Tp>& __x, const _Tp& __v) |
||
| 806 | {
|
||
| 807 | return !(__x > __v); |
||
| 808 | } |
||
| 809 | |||
| 810 | template <class _Tp> |
||
| 811 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 812 | constexpr |
||
| 813 | bool |
||
| 814 | operator<=(const _Tp& __v, const optional<_Tp>& __x) |
||
| 815 | {
|
||
| 816 | return !(__v > __x); |
||
| 817 | } |
||
| 818 | |||
| 819 | template <class _Tp> |
||
| 820 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 821 | constexpr |
||
| 822 | bool |
||
| 823 | operator>(const optional<_Tp>& __x, const _Tp& __v) |
||
| 824 | {
|
||
| 825 | return static_cast<bool>(__x) ? __v < __x : false; |
||
| 826 | } |
||
| 827 | |||
| 828 | template <class _Tp> |
||
| 829 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 830 | constexpr |
||
| 831 | bool |
||
| 832 | operator>(const _Tp& __v, const optional<_Tp>& __x) |
||
| 833 | {
|
||
| 834 | return static_cast<bool>(__x) ? __x < __v : true; |
||
| 835 | } |
||
| 836 | |||
| 837 | template <class _Tp> |
||
| 838 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 839 | constexpr |
||
| 840 | bool |
||
| 841 | operator>=(const optional<_Tp>& __x, const _Tp& __v) |
||
| 842 | {
|
||
| 843 | return !(__x < __v); |
||
| 844 | } |
||
| 845 | |||
| 846 | template <class _Tp> |
||
| 847 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 848 | constexpr |
||
| 849 | bool |
||
| 850 | operator>=(const _Tp& __v, const optional<_Tp>& __x) |
||
| 851 | {
|
||
| 852 | return !(__v < __x); |
||
| 853 | } |
||
| 854 | |||
| 855 | |||
| 856 | template <class _Tp> |
||
| 857 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 858 | void |
||
| 859 | swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y))) |
||
| 860 | {
|
||
| 861 | __x.swap(__y); |
||
| 862 | } |
||
| 863 | |||
| 864 | template <class _Tp> |
||
| 865 | inline _LIBCPP_INLINE_VISIBILITY |
||
| 866 | constexpr |
||
| 867 | optional<typename decay<_Tp>::type> |
||
| 868 | make_optional(_Tp&& __v) |
||
| 869 | {
|
||
| 870 | return optional<typename decay<_Tp>::type>(_VSTD::forward<_Tp>(__v)); |
||
| 871 | } |
||
| 872 | |||
| 873 | _LIBCPP_END_NAMESPACE_LFTS |
||
| 874 | |||
| 875 | _LIBCPP_BEGIN_NAMESPACE_STD |
||
| 876 | |||
| 877 | template <class _Tp> |
||
| 878 | struct _LIBCPP_TYPE_VIS_ONLY hash<std::experimental::optional<_Tp> > |
||
| 879 | {
|
||
| 880 | typedef std::experimental::optional<_Tp> argument_type; |
||
| 881 | typedef size_t result_type; |
||
| 882 | |||
| 883 | _LIBCPP_INLINE_VISIBILITY |
||
| 884 | result_type operator()(const argument_type& __opt) const _NOEXCEPT |
||
| 885 | {
|
||
| 886 | return static_cast<bool>(__opt) ? hash<_Tp>()(*__opt) : 0; |
||
| 887 | } |
||
| 888 | }; |
||
| 889 | |||
| 890 | _LIBCPP_END_NAMESPACE_STD |
||
| 891 | |||
| 892 | #endif // _LIBCPP_STD_VER > 11 |
||
| 893 | |||
| 894 | #endif // _LIBCPP_OPTIONAL |