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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_TUPLE_H10#define _LIBCPP___FWD_TUPLE_H11 12#include <__config>13#include <__cstddef/size_t.h>14 15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)16# pragma GCC system_header17#endif18 19_LIBCPP_BEGIN_NAMESPACE_STD20 21template <size_t, class>22struct tuple_element;23 24template <size_t _Np, class _Tp>25using __tuple_element_t _LIBCPP_NODEBUG = typename tuple_element<_Np, _Tp>::type;26 27#ifndef _LIBCPP_CXX03_LANG28 29template <class...>30class tuple;31 32template <class>33inline const bool __is_tuple_v = false;34 35template <class... _Tp>36inline const bool __is_tuple_v<tuple<_Tp...>> = true;37 38template <size_t _Ip, class... _Tp>39struct tuple_element<_Ip, tuple<_Tp...> > {40 using type _LIBCPP_NODEBUG = __type_pack_element<_Ip, _Tp...>;41};42 43template <class>44struct tuple_size;45 46template <size_t _Ip, class... _Tp>47_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&48get(tuple<_Tp...>&) _NOEXCEPT;49 50template <size_t _Ip, class... _Tp>51_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&52get(const tuple<_Tp...>&) _NOEXCEPT;53 54template <size_t _Ip, class... _Tp>55_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&&56get(tuple<_Tp...>&&) _NOEXCEPT;57 58template <size_t _Ip, class... _Tp>59_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&60get(const tuple<_Tp...>&&) _NOEXCEPT;61 62#endif // _LIBCPP_CXX03_LANG63 64_LIBCPP_END_NAMESPACE_STD65 66#endif // _LIBCPP___FWD_TUPLE_H67