59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___TUPLE_TUPLE_ELEMENT_H
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#define _LIBCPP___TUPLE_TUPLE_ELEMENT_H
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#include <__config>
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#include <__cstddef/size_t.h>
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#include <__tuple/tuple_indices.h>
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#include <__tuple/tuple_types.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <size_t _Ip, class _Tp>
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struct tuple_element;
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template <size_t _Ip, class _Tp>
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struct tuple_element<_Ip, const _Tp> {
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using type _LIBCPP_NODEBUG = const typename tuple_element<_Ip, _Tp>::type;
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};
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template <size_t _Ip, class _Tp>
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struct tuple_element<_Ip, volatile _Tp> {
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using type _LIBCPP_NODEBUG = volatile typename tuple_element<_Ip, _Tp>::type;
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};
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template <size_t _Ip, class _Tp>
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struct tuple_element<_Ip, const volatile _Tp> {
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using type _LIBCPP_NODEBUG = const volatile typename tuple_element<_Ip, _Tp>::type;
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};
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#ifndef _LIBCPP_CXX03_LANG
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template <size_t _Ip, class... _Types>
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struct tuple_element<_Ip, __tuple_types<_Types...> > {
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static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
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using type _LIBCPP_NODEBUG = __type_pack_element<_Ip, _Types...>;
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};
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# if _LIBCPP_STD_VER >= 14
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template <size_t _Ip, class... _Tp>
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using tuple_element_t _LIBCPP_NODEBUG = typename tuple_element<_Ip, _Tp...>::type;
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# endif
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#endif // _LIBCPP_CXX03_LANG
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___TUPLE_TUPLE_ELEMENT_H
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