1//===---------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===---------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___FWD_PAIR_H
10#define _LIBCPP___FWD_PAIR_H
11
12#include <__config>
13#include <__cstddef/size_t.h>
14#include <__fwd/tuple.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17# pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22template <class, class>
23struct pair;
24
25template <class _Type>
26inline const bool __is_pair_v = false;
27
28template <class _Type1, class _Type2>
29inline const bool __is_pair_v<pair<_Type1, _Type2> > = true;
30
31template <size_t _Ip, class _T1, class _T2>
32_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
33get(pair<_T1, _T2>&) _NOEXCEPT;
34
35template <size_t _Ip, class _T1, class _T2>
36_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
37get(const pair<_T1, _T2>&) _NOEXCEPT;
38
39#ifndef _LIBCPP_CXX03_LANG
40template <size_t _Ip, class _T1, class _T2>
41_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
42get(pair<_T1, _T2>&&) _NOEXCEPT;
43
44template <size_t _Ip, class _T1, class _T2>
45_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
46get(const pair<_T1, _T2>&&) _NOEXCEPT;
47#endif
48
49_LIBCPP_END_NAMESPACE_STD
50
51#endif // _LIBCPP___FWD_PAIR_H
52