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63 lines
1.8 KiB
C++
63 lines
1.8 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___UTILITY_IN_PLACE_H
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#define _LIBCPP___UTILITY_IN_PLACE_H
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#include <__config>
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#include <__type_traits/remove_cvref.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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#if _LIBCPP_STD_VER >= 17
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struct _LIBCPP_EXPORTED_FROM_ABI in_place_t {
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explicit in_place_t() = default;
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};
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inline constexpr in_place_t in_place{};
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS in_place_type_t {
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_LIBCPP_HIDE_FROM_ABI explicit in_place_type_t() = default;
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};
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template <class _Tp>
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inline constexpr in_place_type_t<_Tp> in_place_type{};
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template <size_t _Idx>
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struct _LIBCPP_TEMPLATE_VIS in_place_index_t {
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_LIBCPP_HIDE_FROM_ABI explicit in_place_index_t() = default;
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};
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template <size_t _Idx>
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inline constexpr in_place_index_t<_Idx> in_place_index{};
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template <class _Tp>
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struct __is_inplace_type_imp : false_type {};
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template <class _Tp>
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struct __is_inplace_type_imp<in_place_type_t<_Tp>> : true_type {};
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template <class _Tp>
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using __is_inplace_type = __is_inplace_type_imp<__remove_cvref_t<_Tp>>;
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template <class _Tp>
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struct __is_inplace_index_imp : false_type {};
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template <size_t _Idx>
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struct __is_inplace_index_imp<in_place_index_t<_Idx>> : true_type {};
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template <class _Tp>
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using __is_inplace_index = __is_inplace_index_imp<__remove_cvref_t<_Tp>>;
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_IN_PLACE_H
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