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( 45 ::new (std::declval<void*>()) _Tp(std::declval<_Args>()...) 46 )> 47 _LIBCPP_HIDE_FROM_ABI 48 constexpr _Tp* operator()(_Tp* __location, _Args&& ...__args) const { 49 return _VSTD::construct_at(__location, _VSTD::forward<_Args>(__args)...); 50 } 51 }; 52 53 } // namespace __construct_at 54 55 inline namespace __cpo { 56 inline constexpr auto construct_at = __construct_at::__fn{}; 57 } // namespace __cpo 58 59 // destroy_at 60 61 namespace __destroy_at { 62 63 struct __fn { 64 template <destructible _Tp> 65 _LIBCPP_HIDE_FROM_ABI 66 constexpr void operator()(_Tp* __location) const noexcept { 67 _VSTD::destroy_at(__location); 68 } 69 }; 70 71 } // namespace __destroy_at 72 73 inline namespace __cpo { 74 inline constexpr auto destroy_at = __destroy_at::__fn{}; 75 } // namespace __cpo 76 77 // destroy 78 79 namespace __destroy { 80 81 struct __fn { 82 template <__nothrow_input_iterator _InputIterator, __nothrow_sentinel_for<_InputIterator> _Sentinel> 83 requires destructible<iter_value_t<_InputIterator>> 84 _LIBCPP_HIDE_FROM_ABI 85 constexpr _InputIterator operator()(_InputIterator __first, _Sentinel __last) const noexcept { 86 return _VSTD::__destroy(_VSTD::move(__first), _VSTD::move(__last)); 87 } 88 89 template <__nothrow_input_range _InputRange> 90 requires destructible<range_value_t<_InputRange>> 91 _LIBCPP_HIDE_FROM_ABI 92 constexpr borrowed_iterator_t<_InputRange> operator()(_InputRange&& __range) const noexcept { 93 return (*this)(ranges::begin(__range), ranges::end(__range)); 94 } 95 }; 96 97 } // namespace __destroy 98 99 inline namespace __cpo { 100 inline constexpr auto destroy = __destroy::__fn{}; 101 } // namespace __cpo 102 103 // destroy_n 104 105 namespace __destroy_n { 106 107 struct __fn { 108 template <__nothrow_input_iterator _InputIterator> 109 requires destructible<iter_value_t<_InputIterator>> 110 _LIBCPP_HIDE_FROM_ABI 111 constexpr _InputIterator operator()(_InputIterator __first, iter_difference_t<_InputIterator> __n) const noexcept { 112 return _VSTD::destroy_n(_VSTD::move(__first), __n); 113 } 114 }; 115 116 } // namespace __destroy_n 117 118 inline namespace __cpo { 119 inline constexpr auto destroy_n = __destroy_n::__fn{}; 120 } // namespace __cpo 121 122 } // namespace ranges 123 124 #endif // _LIBCPP_STD_VER >= 20 125 126 _LIBCPP_END_NAMESPACE_STD 127 128 _LIBCPP_POP_MACROS 129 130 #endif // _LIBCPP___MEMORY_RANGES_CONSTRUCT_AT_H 131