| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___UTILITY_IN_PLACE_H |
| #define _LIBCPP___UTILITY_IN_PLACE_H |
| |
| #include <__config> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 14 |
| |
| struct _LIBCPP_TYPE_VIS in_place_t { |
| explicit in_place_t() = default; |
| }; |
| inline constexpr in_place_t in_place{}; |
| |
| template <class _Tp> |
| struct _LIBCPP_TEMPLATE_VIS in_place_type_t { |
| explicit in_place_type_t() = default; |
| }; |
| template <class _Tp> |
| inline constexpr in_place_type_t<_Tp> in_place_type{}; |
| |
| template <size_t _Idx> |
| struct _LIBCPP_TEMPLATE_VIS in_place_index_t { |
| explicit in_place_index_t() = default; |
| }; |
| template <size_t _Idx> |
| inline constexpr in_place_index_t<_Idx> in_place_index{}; |
| |
| template <class _Tp> struct __is_inplace_type_imp : false_type {}; |
| template <class _Tp> struct __is_inplace_type_imp<in_place_type_t<_Tp>> : true_type {}; |
| |
| template <class _Tp> |
| using __is_inplace_type = __is_inplace_type_imp<__uncvref_t<_Tp>>; |
| |
| template <class _Tp> struct __is_inplace_index_imp : false_type {}; |
| template <size_t _Idx> struct __is_inplace_index_imp<in_place_index_t<_Idx>> : true_type {}; |
| |
| template <class _Tp> |
| using __is_inplace_index = __is_inplace_index_imp<__uncvref_t<_Tp>>; |
| |
| #endif // _LIBCPP_STD_VER > 14 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___UTILITY_IN_PLACE_H |