LCOM1920-T02G10

// -*- C++ -*-

//===----------------------------- tuple ----------------------------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is dual licensed under the MIT and the University of Illinois Open

// Source Licenses. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_EXPERIMENTAL_TUPLE

#define _LIBCPP_EXPERIMENTAL_TUPLE

/*

    experimental/tuple synopsis

// C++1y

#include <tuple>

namespace std {

namespace experimental {

inline namespace fundamentals_v1 {

  // See C++14 20.4.2.5, tuple helper classes

  template <class T> constexpr size_t tuple_size_v

    = tuple_size<T>::value;

  // 3.2.2, Calling a function with a tuple of arguments

  template <class F, class Tuple>

  constexpr decltype(auto) apply(F&& f, Tuple&& t);

} // namespace fundamentals_v1

} // namespace experimental

} // namespace std

 */

# include <experimental/__config>

#if _LIBCPP_STD_VER > 11

# include <tuple>

# include <utility>

# include <__functional_base>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

#pragma GCC system_header

#endif

_LIBCPP_BEGIN_NAMESPACE_LFTS

#ifndef _LIBCPP_HAS_NO_VARIABLE_TEMPLATES

template <class _Tp>

_LIBCPP_CONSTEXPR size_t tuple_size_v = tuple_size<_Tp>::value;

#endif

template <class _Fn, class _Tuple, size_t ..._Id>

inline _LIBCPP_INLINE_VISIBILITY

decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t,

                                  integer_sequence<size_t, _Id...>) {

    return _VSTD::__invoke(

        _VSTD::forward<_Fn>(__f),

        _VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...

    );

}

template <class _Fn, class _Tuple>

inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11

decltype(auto) apply(_Fn && __f, _Tuple && __t) {

    return _VSTD_LFTS::__apply_tuple_impl(

        _VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t),

        make_index_sequence<tuple_size<typename decay<_Tuple>::type>::value>()

    );

}

_LIBCPP_END_NAMESPACE_LFTS

#endif /* _LIBCPP_STD_VER > 11 */

#endif /* _LIBCPP_EXPERIMENTAL_TUPLE */