1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H 11 #define _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H 12 13 #include <__concepts/destructible.h> 14 #include <__config> 15 #include <__iterator/incrementable_traits.h> 16 #include <__iterator/iterator_traits.h> 17 #include <__memory/concepts.h> 18 #include <__memory/construct_at.h> 19 #include <__ranges/access.h> 20 #include <__ranges/concepts.h> 21 #include <__ranges/dangling.h> 22 #include <__utility/declval.h> 23 #include <__utility/forward.h> 24 #include <__utility/move.h> 25 #include <new> 26 27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 28 # pragma GCC system_header 29 #endif 30 31 _LIBCPP_PUSH_MACROS 32 #include <__undef_macros> 33 34 _LIBCPP_BEGIN_NAMESPACE_STD 35 36 #if _LIBCPP_STD_VER >= 20 37 namespace ranges { 38 39 // construct_at 40 41 namespace __construct_at { 42 43 struct __fn { 44 template <class _Tp, class... _Args, class = decltype(::new(std::declval<void*>()) _Tp(std::declval<_Args>()...))> 45 _LIBCPP_HIDE_FROM_ABI constexpr _Tp* operator()(_Tp* __location, _Args&&... __args) const { 46 return std::construct_at(__location, std::forward<_Args>(__args)...); 47 } 48 }; 49 50 } // namespace __construct_at 51 52 inline namespace __cpo { 53 inline constexpr auto construct_at = __construct_at::__fn{}; 54 } // namespace __cpo 55 56 // destroy_at 57 58 namespace __destroy_at { 59 60 struct __fn { 61 template <destructible _Tp> 62 _LIBCPP_HIDE_FROM_ABI constexpr void operator()(_Tp* __location) const noexcept { 63 std::destroy_at(__location); 64 } 65 }; 66 67 } // namespace __destroy_at 68 69 inline namespace __cpo { 70 inline constexpr auto destroy_at = __destroy_at::__fn{}; 71 } // namespace __cpo 72 73 // destroy 74 75 namespace __destroy { 76 77 struct __fn { 78 template <__nothrow_input_iterator _InputIterator, __nothrow_sentinel_for<_InputIterator> _Sentinel> 79 requires destructible<iter_value_t<_InputIterator>> 80 _LIBCPP_HIDE_FROM_ABI constexpr _InputIterator operator()(_InputIterator __first, _Sentinel __last) const noexcept { 81 return std::__destroy(std::move(__first), std::move(__last)); 82 } 83 84 template <__nothrow_input_range _InputRange> 85 requires destructible<range_value_t<_InputRange>> 86 _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_InputRange> operator()(_InputRange&& __range) const noexcept { 87 return (*this)(ranges::begin(__range), ranges::end(__range)); 88 } 89 }; 90 91 } // namespace __destroy 92 93 inline namespace __cpo { 94 inline constexpr auto destroy = __destroy::__fn{}; 95 } // namespace __cpo 96 97 // destroy_n 98 99 namespace __destroy_n { 100 101 struct __fn { 102 template <__nothrow_input_iterator _InputIterator> 103 requires destructible<iter_value_t<_InputIterator>> 104 _LIBCPP_HIDE_FROM_ABI constexpr _InputIterator 105 operator()(_InputIterator __first, iter_difference_t<_InputIterator> __n) const noexcept { 106 return std::destroy_n(std::move(__first), __n); 107 } 108 }; 109 110 } // namespace __destroy_n 111 112 inline namespace __cpo { 113 inline constexpr auto destroy_n = __destroy_n::__fn{}; 114 } // namespace __cpo 115 116 } // namespace ranges 117 118 #endif // _LIBCPP_STD_VER >= 20 119 120 _LIBCPP_END_NAMESPACE_STD 121 122 _LIBCPP_POP_MACROS 123 124 #endif // _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H 125