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___CXX03___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H 10 #define _LIBCPP___CXX03___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H 11 12 #include <__cxx03/__config> 13 #include <__cxx03/__memory/construct_at.h> 14 #include <__cxx03/__memory/uses_allocator.h> 15 #include <__cxx03/__tuple/tuple_like_no_subrange.h> 16 #include <__cxx03/__type_traits/enable_if.h> 17 #include <__cxx03/__type_traits/is_same.h> 18 #include <__cxx03/__type_traits/remove_cv.h> 19 #include <__cxx03/__utility/declval.h> 20 #include <__cxx03/__utility/pair.h> 21 #include <__cxx03/tuple> 22 23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 24 # pragma GCC system_header 25 #endif 26 27 _LIBCPP_PUSH_MACROS 28 #include <__cxx03/__undef_macros> 29 30 _LIBCPP_BEGIN_NAMESPACE_STD 31 32 #if _LIBCPP_STD_VER >= 17 33 34 template <class _Type> 35 inline constexpr bool __is_std_pair = false; 36 37 template <class _Type1, class _Type2> 38 inline constexpr bool __is_std_pair<pair<_Type1, _Type2>> = true; 39 40 template <class _Tp> 41 inline constexpr bool __is_cv_std_pair = __is_std_pair<remove_cv_t<_Tp>>; 42 43 template <class _Type, class _Alloc, class... _Args, __enable_if_t<!__is_cv_std_pair<_Type>, int> = 0> 44 _LIBCPP_HIDE_FROM_ABI constexpr auto 45 __uses_allocator_construction_args(const _Alloc& __alloc, _Args&&... __args) noexcept { 46 if constexpr (!uses_allocator_v<remove_cv_t<_Type>, _Alloc> && is_constructible_v<_Type, _Args...>) { 47 return std::forward_as_tuple(std::forward<_Args>(__args)...); 48 } else if constexpr (uses_allocator_v<remove_cv_t<_Type>, _Alloc> && 49 is_constructible_v<_Type, allocator_arg_t, const _Alloc&, _Args...>) { 50 return tuple<allocator_arg_t, const _Alloc&, _Args&&...>(allocator_arg, __alloc, std::forward<_Args>(__args)...); 51 } else if constexpr (uses_allocator_v<remove_cv_t<_Type>, _Alloc> && 52 is_constructible_v<_Type, _Args..., const _Alloc&>) { 53 return std::forward_as_tuple(std::forward<_Args>(__args)..., __alloc); 54 } else { 55 static_assert( 56 sizeof(_Type) + 1 == 0, "If uses_allocator_v<Type> is true, the type has to be allocator-constructible"); 57 } 58 } 59 60 template <class _Pair, class _Alloc, class _Tuple1, class _Tuple2, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 61 _LIBCPP_HIDE_FROM_ABI constexpr auto __uses_allocator_construction_args( 62 const _Alloc& __alloc, piecewise_construct_t, _Tuple1&& __x, _Tuple2&& __y) noexcept { 63 return std::make_tuple( 64 piecewise_construct, 65 std::apply( 66 [&__alloc](auto&&... __args1) { 67 return std::__uses_allocator_construction_args<typename _Pair::first_type>( 68 __alloc, std::forward<decltype(__args1)>(__args1)...); 69 }, 70 std::forward<_Tuple1>(__x)), 71 std::apply( 72 [&__alloc](auto&&... __args2) { 73 return std::__uses_allocator_construction_args<typename _Pair::second_type>( 74 __alloc, std::forward<decltype(__args2)>(__args2)...); 75 }, 76 std::forward<_Tuple2>(__y))); 77 } 78 79 template <class _Pair, class _Alloc, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 80 _LIBCPP_HIDE_FROM_ABI constexpr auto __uses_allocator_construction_args(const _Alloc& __alloc) noexcept { 81 return std::__uses_allocator_construction_args<_Pair>(__alloc, piecewise_construct, tuple<>{}, tuple<>{}); 82 } 83 84 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 85 _LIBCPP_HIDE_FROM_ABI constexpr auto 86 __uses_allocator_construction_args(const _Alloc& __alloc, _Up&& __u, _Vp&& __v) noexcept { 87 return std::__uses_allocator_construction_args<_Pair>( 88 __alloc, 89 piecewise_construct, 90 std::forward_as_tuple(std::forward<_Up>(__u)), 91 std::forward_as_tuple(std::forward<_Vp>(__v))); 92 } 93 94 # if _LIBCPP_STD_VER >= 23 95 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 96 _LIBCPP_HIDE_FROM_ABI constexpr auto 97 __uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>& __pair) noexcept { 98 return std::__uses_allocator_construction_args<_Pair>( 99 __alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second)); 100 } 101 # endif 102 103 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 104 _LIBCPP_HIDE_FROM_ABI constexpr auto 105 __uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>& __pair) noexcept { 106 return std::__uses_allocator_construction_args<_Pair>( 107 __alloc, piecewise_construct, std::forward_as_tuple(__pair.first), std::forward_as_tuple(__pair.second)); 108 } 109 110 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 111 _LIBCPP_HIDE_FROM_ABI constexpr auto 112 __uses_allocator_construction_args(const _Alloc& __alloc, pair<_Up, _Vp>&& __pair) noexcept { 113 return std::__uses_allocator_construction_args<_Pair>( 114 __alloc, 115 piecewise_construct, 116 std::forward_as_tuple(std::get<0>(std::move(__pair))), 117 std::forward_as_tuple(std::get<1>(std::move(__pair)))); 118 } 119 120 # if _LIBCPP_STD_VER >= 23 121 template <class _Pair, class _Alloc, class _Up, class _Vp, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 122 _LIBCPP_HIDE_FROM_ABI constexpr auto 123 __uses_allocator_construction_args(const _Alloc& __alloc, const pair<_Up, _Vp>&& __pair) noexcept { 124 return std::__uses_allocator_construction_args<_Pair>( 125 __alloc, 126 piecewise_construct, 127 std::forward_as_tuple(std::get<0>(std::move(__pair))), 128 std::forward_as_tuple(std::get<1>(std::move(__pair)))); 129 } 130 131 template <class _Pair, class _Alloc, __pair_like_no_subrange _PairLike, __enable_if_t<__is_cv_std_pair<_Pair>, int> = 0> 132 _LIBCPP_HIDE_FROM_ABI constexpr auto 133 __uses_allocator_construction_args(const _Alloc& __alloc, _PairLike&& __p) noexcept { 134 return std::__uses_allocator_construction_args<_Pair>( 135 __alloc, 136 piecewise_construct, 137 std::forward_as_tuple(std::get<0>(std::forward<_PairLike>(__p))), 138 std::forward_as_tuple(std::get<1>(std::forward<_PairLike>(__p)))); 139 } 140 # endif 141 142 namespace __uses_allocator_detail { 143 144 template <class _Ap, class _Bp> 145 void __fun(const pair<_Ap, _Bp>&); 146 147 template <class _Tp> 148 decltype(__uses_allocator_detail::__fun(std::declval<_Tp>()), true_type()) __convertible_to_const_pair_ref_impl(int); 149 150 template <class> 151 false_type __convertible_to_const_pair_ref_impl(...); 152 153 template <class _Tp> 154 inline constexpr bool __convertible_to_const_pair_ref = 155 decltype(__uses_allocator_detail::__convertible_to_const_pair_ref_impl<_Tp>(0))::value; 156 157 # if _LIBCPP_STD_VER >= 23 158 template <class _Tp, class _Up> 159 inline constexpr bool __uses_allocator_constraints = 160 __is_cv_std_pair<_Tp> && !__pair_like_no_subrange<_Up> && !__convertible_to_const_pair_ref<_Up>; 161 # else 162 template <class _Tp, class _Up> 163 inline constexpr bool __uses_allocator_constraints = __is_cv_std_pair<_Tp> && !__convertible_to_const_pair_ref<_Up>; 164 # endif 165 166 } // namespace __uses_allocator_detail 167 168 template < class _Pair, 169 class _Alloc, 170 class _Type, 171 __enable_if_t<__uses_allocator_detail::__uses_allocator_constraints<_Pair, _Type>, int> = 0> 172 _LIBCPP_HIDE_FROM_ABI constexpr auto 173 __uses_allocator_construction_args(const _Alloc& __alloc, _Type&& __value) noexcept; 174 175 template <class _Type, class _Alloc, class... _Args> 176 _LIBCPP_HIDE_FROM_ABI constexpr _Type __make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args); 177 178 template < class _Pair, 179 class _Alloc, 180 class _Type, 181 __enable_if_t< __uses_allocator_detail::__uses_allocator_constraints<_Pair, _Type>, int>> 182 _LIBCPP_HIDE_FROM_ABI constexpr auto 183 __uses_allocator_construction_args(const _Alloc& __alloc, _Type&& __value) noexcept { 184 struct __pair_constructor { 185 using _PairMutable = remove_cv_t<_Pair>; 186 187 _LIBCPP_HIDDEN constexpr auto __do_construct(const _PairMutable& __pair) const { 188 return std::__make_obj_using_allocator<_PairMutable>(__alloc_, __pair); 189 } 190 191 _LIBCPP_HIDDEN constexpr auto __do_construct(_PairMutable&& __pair) const { 192 return std::__make_obj_using_allocator<_PairMutable>(__alloc_, std::move(__pair)); 193 } 194 195 const _Alloc& __alloc_; 196 _Type& __value_; 197 198 _LIBCPP_HIDDEN constexpr operator _PairMutable() const { return __do_construct(std::forward<_Type>(__value_)); } 199 }; 200 201 return std::make_tuple(__pair_constructor{__alloc, __value}); 202 } 203 204 template <class _Type, class _Alloc, class... _Args> 205 _LIBCPP_HIDE_FROM_ABI constexpr _Type __make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args) { 206 return std::make_from_tuple<_Type>( 207 std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)); 208 } 209 210 template <class _Type, class _Alloc, class... _Args> 211 _LIBCPP_HIDE_FROM_ABI constexpr _Type* 212 __uninitialized_construct_using_allocator(_Type* __ptr, const _Alloc& __alloc, _Args&&... __args) { 213 return std::apply( 214 [&__ptr](auto&&... __xs) { return std::__construct_at(__ptr, std::forward<decltype(__xs)>(__xs)...); }, 215 std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)); 216 } 217 218 #endif // _LIBCPP_STD_VER >= 17 219 220 #if _LIBCPP_STD_VER >= 20 221 222 template <class _Type, class _Alloc, class... _Args> 223 _LIBCPP_HIDE_FROM_ABI constexpr auto uses_allocator_construction_args(const _Alloc& __alloc, _Args&&... __args) noexcept 224 -> decltype(std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...)) { 225 return /*--*/ std::__uses_allocator_construction_args<_Type>(__alloc, std::forward<_Args>(__args)...); 226 } 227 228 template <class _Type, class _Alloc, class... _Args> 229 _LIBCPP_HIDE_FROM_ABI constexpr auto make_obj_using_allocator(const _Alloc& __alloc, _Args&&... __args) 230 -> decltype(std::__make_obj_using_allocator<_Type>(__alloc, std::forward<_Args>(__args)...)) { 231 return /*--*/ std::__make_obj_using_allocator<_Type>(__alloc, std::forward<_Args>(__args)...); 232 } 233 234 template <class _Type, class _Alloc, class... _Args> 235 _LIBCPP_HIDE_FROM_ABI constexpr auto 236 uninitialized_construct_using_allocator(_Type* __ptr, const _Alloc& __alloc, _Args&&... __args) 237 -> decltype(std::__uninitialized_construct_using_allocator(__ptr, __alloc, std::forward<_Args>(__args)...)) { 238 return /*--*/ std::__uninitialized_construct_using_allocator(__ptr, __alloc, std::forward<_Args>(__args)...); 239 } 240 241 #endif // _LIBCPP_STD_VER >= 20 242 243 _LIBCPP_END_NAMESPACE_STD 244 245 _LIBCPP_POP_MACROS 246 247 #endif // _LIBCPP___CXX03___MEMORY_USES_ALLOCATOR_CONSTRUCTION_H 248