1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H 10 #define _LIBCPP___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H 11 12 #include <__config> 13 #include <__memory/construct_at.h> 14 #include <__memory/uses_allocator.h> 15 #include <__type_traits/enable_if.h> 16 #include <__type_traits/is_same.h> 17 #include <__type_traits/remove_cv.h> 18 #include <__utility/declval.h> 19 #include <__utility/pair.h> 20 #include <tuple> 21 22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23 # pragma GCC system_header 24 #endif 25 26 _LIBCPP_PUSH_MACROS 27 #include <__undef_macros> 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 #if _LIBCPP_STD_VER >= 17 32 33 template <class _Type> 34 inline constexpr bool __is_std_pair = false; 35 36 template <class _Type1, class _Type2> 37 inline constexpr bool __is_std_pair<pair<_Type1, _Type2>> = true; 38 39 template <class _Type, class _Alloc, class... _Args, __enable_if_t<!__is_std_pair<_Type>, int> = 0> 40 _LIBCPP_HIDE_FROM_ABI constexpr auto 41 __uses_allocator_construction_args(const _Alloc& __alloc, _Args&&... __args) noexcept { 42 if constexpr (!uses_allocator_v<_Type, _Alloc> && is_constructible_v<_Type, _Args...>) { 43 return std::forward_as_tuple(std::forward<_Args>(__args)...); 44 } else if constexpr (uses_allocator_v<_Type, _Alloc> && 45 is_constructible_v<_Type, allocator_arg_t, const _Alloc&, _Args...>) { 46 return tuple<allocator_arg_t, const _Alloc&, _Args&&...>(allocator_arg, __alloc, std::forward<_Args>(__args)...); 47 } else if constexpr (uses_allocator_v<_Type, _Alloc> && is_constructible_v<_Type, _Args..., const _Alloc&>) { 48 return std::forward_as_tuple(std::forward<_Args>(__args)..., __alloc); 49 } else { 50 static_assert( 51 sizeof(_Type) + 1 == 0, "If uses_allocator_v<Type> is true, the type has to be allocator-constructible"); 52 } 53 } 54 55 template <class _Pair, class _Alloc, class _Tuple1, class _Tuple2, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 56 _LIBCPP_HIDE_FROM_ABI constexpr auto __uses_allocator_construction_args( 57 const _Alloc& __alloc, piecewise_construct_t, _Tuple1&& __x, _Tuple2&& __y) noexcept { 58 return std::make_tuple( 59 piecewise_construct, 60 std::apply( 61 [&__alloc](auto&&... __args1) { 62 return std::__uses_allocator_construction_args<typename _Pair::first_type>( 63 __alloc, std::forward<decltype(__args1)>(__args1)...); 64 }, 65 std::forward<_Tuple1>(__x)), 66 std::apply( 67 [&__alloc](auto&&... __args2) { 68 return std::__uses_allocator_construction_args<typename _Pair::second_type>( 69 __alloc, std::forward<decltype(__args2)>(__args2)...); 70 }, 71 std::forward<_Tuple2>(__y))); 72 } 73 74 template <class _Pair, class _Alloc, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 75 _LIBCPP_HIDE_FROM_ABI constexpr auto __uses_allocator_construction_args(const _Alloc& __alloc) noexcept { 76 return std::__uses_allocator_construction_args<_Pair>(__alloc, piecewise_construct, tuple<>{}, tuple<>{}); 77 } 78 79 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 80 _LIBCPP_HIDE_FROM_ABI constexpr auto 81 __uses_allocator_construction_args(const _Alloc& __alloc, _Up&& __u, _Vp&& __v) noexcept { 82 return std::__uses_allocator_construction_args<_Pair>( 83 __alloc, 84 piecewise_construct, 85 std::forward_as_tuple(std::forward<_Up>(__u)), 86 std::forward_as_tuple(std::forward<_Vp>(__v))); 87 } 88 89 # if _LIBCPP_STD_VER >= 23 90 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 91 _LIBCPP_HIDE_FROM_ABI constexpr auto 92 __uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>& __pair) noexcept { 93 return std::__uses_allocator_construction_args<_Pair>( 94 __alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second)); 95 } 96 # endif 97 98 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 99 _LIBCPP_HIDE_FROM_ABI constexpr auto 100 __uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>& __pair) noexcept { 101 return std::__uses_allocator_construction_args<_Pair>( 102 __alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second)); 103 } 104 105 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 106 _LIBCPP_HIDE_FROM_ABI constexpr auto 107 __uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>&& __pair) noexcept { 108 return std::__uses_allocator_construction_args<_Pair>( 109 __alloc, 110 piecewise_construct, 111 std::forward_as_tuple(std::get<0>(std::move(__pair))), 112 std::forward_as_tuple(std::get<1>(std::move(__pair)))); 113 } 114 115 # if _LIBCPP_STD_VER >= 23 116 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_std_pair<_Pair>, int> = 0> 117 _LIBCPP_HIDE_FROM_ABI constexpr auto 118 __uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>&& __pair) noexcept { 119 return std::__uses_allocator_construction_args<_Pair>( 120 __alloc, 121 piecewise_construct, 122 std::forward_as_tuple(std::get<0>(std::move(__pair))), 123 std::forward_as_tuple(std::get<1>(std::move(__pair)))); 124 } 125 # endif 126 127 namespace __uses_allocator_detail { 128 129 template <class _Ap, class _Bp> 130 void __fun(const pair<_Ap, _Bp>&); 131 132 template <class _Tp> 133 decltype(__uses_allocator_detail::__fun(std::declval<_Tp>()), true_type()) __convertible_to_const_pair_ref_impl(int); 134 135 template <class> 136 false_type __convertible_to_const_pair_ref_impl(...); 137 138 template <class _Tp> 139 inline constexpr bool __convertible_to_const_pair_ref = 140 decltype(__uses_allocator_detail::__convertible_to_const_pair_ref_impl<_Tp>(0))::value; 141 142 } // namespace __uses_allocator_detail 143 144 template < 145 class _Pair, 146 class _Alloc, 147 class _Type, 148 __enable_if_t<__is_std_pair<_Pair> && !__uses_allocator_detail::__convertible_to_const_pair_ref<_Type>, int> = 0> 149 _LIBCPP_HIDE_FROM_ABI constexpr auto 150 __uses_allocator_construction_args(const _Alloc& __alloc, _Type&& __value) noexcept; 151 152 template <class _Type, class _Alloc, class... _Args> 153 _LIBCPP_HIDE_FROM_ABI constexpr _Type __make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args); 154 155 template <class _Pair, 156 class _Alloc, 157 class _Type, 158 __enable_if_t<__is_std_pair<_Pair> && !__uses_allocator_detail::__convertible_to_const_pair_ref<_Type>, int>> 159 _LIBCPP_HIDE_FROM_ABI constexpr auto 160 __uses_allocator_construction_args(const _Alloc& __alloc, _Type&& __value) noexcept { 161 struct __pair_constructor { 162 using _PairMutable = remove_cv_t<_Pair>; 163 164 _LIBCPP_HIDE_FROM_ABI constexpr auto __do_construct(const _PairMutable& __pair) const { 165 return std::__make_obj_using_allocator<_PairMutable>(__alloc_, __pair); 166 } 167 168 _LIBCPP_HIDE_FROM_ABI constexpr auto __do_construct(_PairMutable&& __pair) const { 169 return std::__make_obj_using_allocator<_PairMutable>(__alloc_, std::move(__pair)); 170 } 171 172 const _Alloc& __alloc_; 173 _Type& __value_; 174 175 _LIBCPP_HIDE_FROM_ABI constexpr operator _PairMutable() const { 176 return __do_construct(std::forward<_Type>(this->__value_)); 177 } 178 }; 179 180 return std::make_tuple(__pair_constructor{__alloc, __value}); 181 } 182 183 template <class _Type, class _Alloc, class... _Args> 184 _LIBCPP_HIDE_FROM_ABI constexpr _Type __make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args) { 185 return std::make_from_tuple<_Type>( 186 std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)); 187 } 188 189 template <class _Type, class _Alloc, class... _Args> 190 _LIBCPP_HIDE_FROM_ABI constexpr _Type* 191 __uninitialized_construct_using_allocator(_Type* __ptr, const _Alloc& __alloc, _Args&&... __args) { 192 return std::apply( 193 [&__ptr](auto&&... __xs) { return std::__construct_at(__ptr, std::forward<decltype(__xs)>(__xs)...); }, 194 std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)); 195 } 196 197 #endif // _LIBCPP_STD_VER >= 17 198 199 #if _LIBCPP_STD_VER >= 20 200 201 template <class _Type, class _Alloc, class... _Args> 202 _LIBCPP_HIDE_FROM_ABI constexpr auto uses_allocator_construction_args(const _Alloc& __alloc, _Args&&... __args) noexcept 203 -> decltype(std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)) { 204 return /*--*/ std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...); 205 } 206 207 template <class _Type, class _Alloc, class... _Args> 208 _LIBCPP_HIDE_FROM_ABI constexpr auto make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args) 209 -> decltype(std::__make_obj_using_allocator<_Type>(__alloc, std::forward<_Args>(__args)...)) { 210 return /*--*/ std::__make_obj_using_allocator<_Type>(__alloc, std::forward<_Args>(__args)...); 211 } 212 213 template <class _Type, class _Alloc, class... _Args> 214 _LIBCPP_HIDE_FROM_ABI constexpr auto 215 uninitialized_construct_using_allocator(_Type* __ptr, const _Alloc& __alloc, _Args&&... __args) 216 -> decltype(std::__uninitialized_construct_using_allocator(__ptr, __alloc, std::forward<_Args>(__args)...)) { 217 return /*--*/ std::__uninitialized_construct_using_allocator(__ptr, __alloc, std::forward<_Args>(__args)...); 218 } 219 220 #endif // _LIBCPP_STD_VER >= 20 221 222 _LIBCPP_END_NAMESPACE_STD 223 224 _LIBCPP_POP_MACROS 225 226 #endif // _LIBCPP___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H 227