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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-exception6//7//===---------------------------------------------------------------------===//8 9#ifndef _LIBCPP___FWD_PAIR_H10#define _LIBCPP___FWD_PAIR_H11 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_header18#endif19 20_LIBCPP_BEGIN_NAMESPACE_STD21 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_LANG40template <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#endif48 49_LIBCPP_END_NAMESPACE_STD50 51#endif // _LIBCPP___FWD_PAIR_H52