ec11388b33
Rename the `__tuple` directory in libc++ headers to `__tuple_dir`
to avoid file collision when installing. Historically, `__tuple` has
been a file and it has been replaced by a directory
in 2d52c6bfae. Replacing a regular file
with a directory (or more importantly, the other way around when
downgrading) is not universally supported. Since this is an internal
header, its actual name should not matter, so just rename it to avoid
problems.
Differential Revision: https://reviews.llvm.org/D139270
94 lines
2.8 KiB
C++
94 lines
2.8 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 <__tuple_dir/tuple_indices.h>
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#include <__tuple_dir/tuple_types.h>
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#include <__type_traits/add_const.h>
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#include <__type_traits/add_cv.h>
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#include <__type_traits/add_volatile.h>
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#include <cstddef>
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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> struct _LIBCPP_TEMPLATE_VIS tuple_element;
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template <size_t _Ip, class _Tp>
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struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp>
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{
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typedef _LIBCPP_NODEBUG typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
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};
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template <size_t _Ip, class _Tp>
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struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp>
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{
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typedef _LIBCPP_NODEBUG typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
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};
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template <size_t _Ip, class _Tp>
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struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp>
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{
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typedef _LIBCPP_NODEBUG typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
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};
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#ifndef _LIBCPP_CXX03_LANG
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#if !__has_builtin(__type_pack_element)
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namespace __indexer_detail {
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template <size_t _Idx, class _Tp>
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struct __indexed { using type _LIBCPP_NODEBUG = _Tp; };
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template <class _Types, class _Indexes> struct __indexer;
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template <class ..._Types, size_t ..._Idx>
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struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
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: __indexed<_Idx, _Types>...
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{};
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template <size_t _Idx, class _Tp>
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__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);
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} // namespace __indexer_detail
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template <size_t _Idx, class ..._Types>
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using __type_pack_element _LIBCPP_NODEBUG = typename decltype(
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__indexer_detail::__at_index<_Idx>(
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__indexer_detail::__indexer<
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__tuple_types<_Types...>,
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typename __make_tuple_indices<sizeof...(_Types)>::type
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>{})
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)::type;
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#endif
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template <size_t _Ip, class ..._Types>
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struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...> >
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{
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static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
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typedef _LIBCPP_NODEBUG __type_pack_element<_Ip, _Types...> type;
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};
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#if _LIBCPP_STD_VER > 11
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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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