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

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source code of libcxx/include/__memory/uses_allocator_construction.h