2 //===----------------------------------------------------------------------===//
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
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_SCOPED_ALLOCATOR
11 #define _LIBCPP_SCOPED_ALLOCATOR
14 scoped_allocator synopsis
19 template <class OuterAlloc, class... InnerAllocs>
20 class scoped_allocator_adaptor : public OuterAlloc
22 typedef allocator_traits<OuterAlloc> OuterTraits; // exposition only
23 scoped_allocator_adaptor<InnerAllocs...> inner; // exposition only
26 typedef OuterAlloc outer_allocator_type;
27 typedef see below inner_allocator_type;
29 typedef typename OuterTraits::value_type value_type;
30 typedef typename OuterTraits::size_type size_type;
31 typedef typename OuterTraits::difference_type difference_type;
32 typedef typename OuterTraits::pointer pointer;
33 typedef typename OuterTraits::const_pointer const_pointer;
34 typedef typename OuterTraits::void_pointer void_pointer;
35 typedef typename OuterTraits::const_void_pointer const_void_pointer;
37 typedef see below propagate_on_container_copy_assignment;
38 typedef see below propagate_on_container_move_assignment;
39 typedef see below propagate_on_container_swap;
40 typedef see below is_always_equal;
45 typedef scoped_allocator_adaptor<
46 OuterTraits::template rebind_alloc<Tp>, InnerAllocs...> other;
49 scoped_allocator_adaptor();
50 template <class OuterA2>
51 scoped_allocator_adaptor(OuterA2&& outerAlloc,
52 const InnerAllocs&... innerAllocs) noexcept;
53 scoped_allocator_adaptor(const scoped_allocator_adaptor& other) noexcept;
54 scoped_allocator_adaptor(scoped_allocator_adaptor&& other) noexcept;
55 template <class OuterA2>
56 scoped_allocator_adaptor(const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& other) noexcept;
57 template <class OuterA2>
58 scoped_allocator_adaptor(const scoped_allocator_adaptor<OuterA2, InnerAllocs...>&& other) noexcept;
60 scoped_allocator_adaptor& operator=(const scoped_allocator_adaptor&) = default;
61 scoped_allocator_adaptor& operator=(scoped_allocator_adaptor&&) = default;
62 ~scoped_allocator_adaptor();
64 inner_allocator_type& inner_allocator() noexcept;
65 const inner_allocator_type& inner_allocator() const noexcept;
67 outer_allocator_type& outer_allocator() noexcept;
68 const outer_allocator_type& outer_allocator() const noexcept;
70 pointer allocate(size_type n); // [[nodiscard]] in C++20
71 pointer allocate(size_type n, const_void_pointer hint); // [[nodiscard]] in C++20
72 void deallocate(pointer p, size_type n) noexcept;
74 size_type max_size() const;
75 template <class T, class... Args> void construct(T* p, Args&& args);
76 template <class T1, class T2, class... Args1, class... Args2>
77 void construct(pair<T1, T2>* p, piecewise_construct t, tuple<Args1...> x,
79 template <class T1, class T2>
80 void construct(pair<T1, T2>* p);
81 template <class T1, class T2, class U, class V>
82 void construct(pair<T1, T2>* p, U&& x, V&& y);
83 template <class T1, class T2, class U, class V>
84 void construct(pair<T1, T2>* p, const pair<U, V>& x);
85 template <class T1, class T2, class U, class V>
86 void construct(pair<T1, T2>* p, pair<U, V>&& x);
87 template <class T> void destroy(T* p);
89 template <class T> void destroy(T* p) noexcept;
91 scoped_allocator_adaptor select_on_container_copy_construction() const noexcept;
94 template<class OuterAlloc, class... InnerAllocs>
95 scoped_allocator_adaptor(OuterAlloc, InnerAllocs...)
96 -> scoped_allocator_adaptor<OuterAlloc, InnerAllocs...>;
98 template <class OuterA1, class OuterA2, class... InnerAllocs>
100 operator==(const scoped_allocator_adaptor<OuterA1, InnerAllocs...>& a,
101 const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& b) noexcept;
103 template <class OuterA1, class OuterA2, class... InnerAllocs>
105 operator!=(const scoped_allocator_adaptor<OuterA1, InnerAllocs...>& a,
106 const scoped_allocator_adaptor<OuterA2, InnerAllocs...>& b) noexcept; // removed in C++20
113 #include <__memory/allocator_traits.h>
114 #include <__memory/uses_allocator_construction.h>
115 #include <__type_traits/common_type.h>
116 #include <__type_traits/enable_if.h>
117 #include <__type_traits/integral_constant.h>
118 #include <__type_traits/is_constructible.h>
119 #include <__type_traits/remove_reference.h>
120 #include <__utility/declval.h>
121 #include <__utility/forward.h>
122 #include <__utility/move.h>
123 #include <__utility/pair.h>
124 #include <__utility/piecewise_construct.h>
128 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
129 # pragma GCC system_header
133 #include <__undef_macros>
135 _LIBCPP_BEGIN_NAMESPACE_STD
137 #if !defined(_LIBCPP_CXX03_LANG)
139 // scoped_allocator_adaptor
141 template <class... _Allocs>
142 class scoped_allocator_adaptor;
144 template <class... _Allocs>
145 struct __get_poc_copy_assignment;
148 struct __get_poc_copy_assignment<_A0> {
149 static const bool value = allocator_traits<_A0>::propagate_on_container_copy_assignment::value;
152 template <class _A0, class... _Allocs>
153 struct __get_poc_copy_assignment<_A0, _Allocs...> {
154 static const bool value = allocator_traits<_A0>::propagate_on_container_copy_assignment::value ||
155 __get_poc_copy_assignment<_Allocs...>::value;
158 template <class... _Allocs>
159 struct __get_poc_move_assignment;
162 struct __get_poc_move_assignment<_A0> {
163 static const bool value = allocator_traits<_A0>::propagate_on_container_move_assignment::value;
166 template <class _A0, class... _Allocs>
167 struct __get_poc_move_assignment<_A0, _Allocs...> {
168 static const bool value = allocator_traits<_A0>::propagate_on_container_move_assignment::value ||
169 __get_poc_move_assignment<_Allocs...>::value;
172 template <class... _Allocs>
173 struct __get_poc_swap;
176 struct __get_poc_swap<_A0> {
177 static const bool value = allocator_traits<_A0>::propagate_on_container_swap::value;
180 template <class _A0, class... _Allocs>
181 struct __get_poc_swap<_A0, _Allocs...> {
182 static const bool value =
183 allocator_traits<_A0>::propagate_on_container_swap::value || __get_poc_swap<_Allocs...>::value;
186 template <class... _Allocs>
187 struct __get_is_always_equal;
190 struct __get_is_always_equal<_A0> {
191 static const bool value = allocator_traits<_A0>::is_always_equal::value;
194 template <class _A0, class... _Allocs>
195 struct __get_is_always_equal<_A0, _Allocs...> {
196 static const bool value = allocator_traits<_A0>::is_always_equal::value && __get_is_always_equal<_Allocs...>::value;
199 template <class... _Allocs>
200 class __scoped_allocator_storage;
202 template <class _OuterAlloc, class... _InnerAllocs>
203 class __scoped_allocator_storage<_OuterAlloc, _InnerAllocs...> : public _OuterAlloc {
204 typedef _OuterAlloc outer_allocator_type;
207 typedef scoped_allocator_adaptor<_InnerAllocs...> inner_allocator_type;
210 inner_allocator_type __inner_;
213 _LIBCPP_HIDE_FROM_ABI __scoped_allocator_storage() _NOEXCEPT {}
215 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
216 _LIBCPP_HIDE_FROM_ABI
217 __scoped_allocator_storage(_OuterA2&& __outer_alloc, const _InnerAllocs&... __inner_allocs) _NOEXCEPT
218 : outer_allocator_type(std::forward<_OuterA2>(__outer_alloc)),
219 __inner_(__inner_allocs...) {}
221 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, const _OuterA2&>::value, int> = 0>
222 _LIBCPP_HIDE_FROM_ABI
223 __scoped_allocator_storage(const __scoped_allocator_storage<_OuterA2, _InnerAllocs...>& __other) _NOEXCEPT
224 : outer_allocator_type(__other.outer_allocator()),
225 __inner_(__other.inner_allocator()) {}
227 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
228 _LIBCPP_HIDE_FROM_ABI
229 __scoped_allocator_storage(__scoped_allocator_storage<_OuterA2, _InnerAllocs...>&& __other) _NOEXCEPT
230 : outer_allocator_type(std::move(__other.outer_allocator())),
231 __inner_(std::move(__other.inner_allocator())) {}
233 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
234 _LIBCPP_HIDE_FROM_ABI __scoped_allocator_storage(_OuterA2&& __o, const inner_allocator_type& __i) _NOEXCEPT
235 : outer_allocator_type(std::forward<_OuterA2>(__o)),
238 _LIBCPP_HIDE_FROM_ABI inner_allocator_type& inner_allocator() _NOEXCEPT { return __inner_; }
239 _LIBCPP_HIDE_FROM_ABI const inner_allocator_type& inner_allocator() const _NOEXCEPT { return __inner_; }
241 _LIBCPP_HIDE_FROM_ABI outer_allocator_type& outer_allocator() _NOEXCEPT {
242 return static_cast<outer_allocator_type&>(*this);
244 _LIBCPP_HIDE_FROM_ABI const outer_allocator_type& outer_allocator() const _NOEXCEPT {
245 return static_cast<const outer_allocator_type&>(*this);
248 scoped_allocator_adaptor<outer_allocator_type, _InnerAllocs...> _LIBCPP_HIDE_FROM_ABI
249 select_on_container_copy_construction() const _NOEXCEPT {
250 return scoped_allocator_adaptor<outer_allocator_type, _InnerAllocs...>(
251 allocator_traits<outer_allocator_type>::select_on_container_copy_construction(outer_allocator()),
252 allocator_traits<inner_allocator_type>::select_on_container_copy_construction(inner_allocator()));
256 friend class __scoped_allocator_storage;
259 template <class _OuterAlloc>
260 class __scoped_allocator_storage<_OuterAlloc> : public _OuterAlloc {
261 typedef _OuterAlloc outer_allocator_type;
264 typedef scoped_allocator_adaptor<_OuterAlloc> inner_allocator_type;
266 _LIBCPP_HIDE_FROM_ABI __scoped_allocator_storage() _NOEXCEPT {}
268 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
269 _LIBCPP_HIDE_FROM_ABI __scoped_allocator_storage(_OuterA2&& __outer_alloc) _NOEXCEPT
270 : outer_allocator_type(std::forward<_OuterA2>(__outer_alloc)) {}
272 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, const _OuterA2&>::value, int> = 0>
273 _LIBCPP_HIDE_FROM_ABI __scoped_allocator_storage(const __scoped_allocator_storage<_OuterA2>& __other) _NOEXCEPT
274 : outer_allocator_type(__other.outer_allocator()) {}
276 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
277 _LIBCPP_HIDE_FROM_ABI __scoped_allocator_storage(__scoped_allocator_storage<_OuterA2>&& __other) _NOEXCEPT
278 : outer_allocator_type(std::move(__other.outer_allocator())) {}
280 _LIBCPP_HIDE_FROM_ABI inner_allocator_type& inner_allocator() _NOEXCEPT {
281 return static_cast<inner_allocator_type&>(*this);
283 _LIBCPP_HIDE_FROM_ABI const inner_allocator_type& inner_allocator() const _NOEXCEPT {
284 return static_cast<const inner_allocator_type&>(*this);
287 _LIBCPP_HIDE_FROM_ABI outer_allocator_type& outer_allocator() _NOEXCEPT {
288 return static_cast<outer_allocator_type&>(*this);
290 _LIBCPP_HIDE_FROM_ABI const outer_allocator_type& outer_allocator() const _NOEXCEPT {
291 return static_cast<const outer_allocator_type&>(*this);
294 _LIBCPP_HIDE_FROM_ABI scoped_allocator_adaptor<outer_allocator_type>
295 select_on_container_copy_construction() const _NOEXCEPT {
296 return scoped_allocator_adaptor<outer_allocator_type>(
297 allocator_traits<outer_allocator_type>::select_on_container_copy_construction(outer_allocator()));
300 __scoped_allocator_storage(const outer_allocator_type& __o, const inner_allocator_type& __i) _NOEXCEPT;
303 friend class __scoped_allocator_storage;
308 template <class _Alloc>
309 decltype(std::declval<_Alloc>().outer_allocator(), true_type()) __has_outer_allocator_test(_Alloc&& __a);
311 template <class _Alloc>
312 false_type __has_outer_allocator_test(const volatile _Alloc& __a);
314 template <class _Alloc>
315 struct __has_outer_allocator
316 : public common_type< decltype(std::__has_outer_allocator_test(std::declval<_Alloc&>()))>::type {};
318 template <class _Alloc, bool = __has_outer_allocator<_Alloc>::value>
321 _LIBCPP_HIDE_FROM_ABI type& operator()(type& __a) const _NOEXCEPT { return __a; }
324 template <class _Alloc>
325 struct __outermost<_Alloc, true> {
326 typedef __libcpp_remove_reference_t< decltype(std::declval<_Alloc>().outer_allocator()) > _OuterAlloc;
327 typedef typename __outermost<_OuterAlloc>::type type;
328 _LIBCPP_HIDE_FROM_ABI type& operator()(_Alloc& __a) const _NOEXCEPT {
329 return __outermost<_OuterAlloc>()(__a.outer_allocator());
333 template <class _OuterAlloc, class... _InnerAllocs>
334 class _LIBCPP_TEMPLATE_VIS scoped_allocator_adaptor<_OuterAlloc, _InnerAllocs...>
335 : public __scoped_allocator_storage<_OuterAlloc, _InnerAllocs...> {
336 typedef __scoped_allocator_storage<_OuterAlloc, _InnerAllocs...> _Base;
337 typedef allocator_traits<_OuterAlloc> _OuterTraits;
340 typedef _OuterAlloc outer_allocator_type;
341 typedef typename _Base::inner_allocator_type inner_allocator_type;
342 typedef typename _OuterTraits::size_type size_type;
343 typedef typename _OuterTraits::difference_type difference_type;
344 typedef typename _OuterTraits::pointer pointer;
345 typedef typename _OuterTraits::const_pointer const_pointer;
346 typedef typename _OuterTraits::void_pointer void_pointer;
347 typedef typename _OuterTraits::const_void_pointer const_void_pointer;
349 typedef integral_constant< bool, __get_poc_copy_assignment<outer_allocator_type, _InnerAllocs...>::value >
350 propagate_on_container_copy_assignment;
351 typedef integral_constant< bool, __get_poc_move_assignment<outer_allocator_type, _InnerAllocs...>::value >
352 propagate_on_container_move_assignment;
353 typedef integral_constant< bool, __get_poc_swap<outer_allocator_type, _InnerAllocs...>::value >
354 propagate_on_container_swap;
355 typedef integral_constant< bool, __get_is_always_equal<outer_allocator_type, _InnerAllocs...>::value >
360 typedef scoped_allocator_adaptor< typename _OuterTraits::template rebind_alloc<_Tp>, _InnerAllocs... > other;
363 _LIBCPP_HIDE_FROM_ABI scoped_allocator_adaptor() _NOEXCEPT {}
364 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
365 _LIBCPP_HIDE_FROM_ABI
366 scoped_allocator_adaptor(_OuterA2&& __outer_alloc, const _InnerAllocs&... __inner_allocs) _NOEXCEPT
367 : _Base(std::forward<_OuterA2>(__outer_alloc), __inner_allocs...) {}
368 // scoped_allocator_adaptor(const scoped_allocator_adaptor& __other) = default;
369 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, const _OuterA2&>::value, int> = 0>
370 _LIBCPP_HIDE_FROM_ABI
371 scoped_allocator_adaptor(const scoped_allocator_adaptor<_OuterA2, _InnerAllocs...>& __other) _NOEXCEPT
373 template <class _OuterA2, __enable_if_t<is_constructible<outer_allocator_type, _OuterA2>::value, int> = 0>
374 _LIBCPP_HIDE_FROM_ABI
375 scoped_allocator_adaptor(scoped_allocator_adaptor<_OuterA2, _InnerAllocs...>&& __other) _NOEXCEPT
376 : _Base(std::move(__other)) {}
378 // scoped_allocator_adaptor& operator=(const scoped_allocator_adaptor&) = default;
379 // scoped_allocator_adaptor& operator=(scoped_allocator_adaptor&&) = default;
380 // ~scoped_allocator_adaptor() = default;
382 _LIBCPP_HIDE_FROM_ABI inner_allocator_type& inner_allocator() _NOEXCEPT { return _Base::inner_allocator(); }
383 _LIBCPP_HIDE_FROM_ABI const inner_allocator_type& inner_allocator() const _NOEXCEPT {
384 return _Base::inner_allocator();
387 _LIBCPP_HIDE_FROM_ABI outer_allocator_type& outer_allocator() _NOEXCEPT { return _Base::outer_allocator(); }
388 _LIBCPP_HIDE_FROM_ABI const outer_allocator_type& outer_allocator() const _NOEXCEPT {
389 return _Base::outer_allocator();
392 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI pointer allocate(size_type __n) {
393 return allocator_traits<outer_allocator_type>::allocate(outer_allocator(), __n);
395 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI pointer allocate(size_type __n, const_void_pointer __hint) {
396 return allocator_traits<outer_allocator_type>::allocate(outer_allocator(), __n, __hint);
399 _LIBCPP_HIDE_FROM_ABI void deallocate(pointer __p, size_type __n) _NOEXCEPT {
400 allocator_traits<outer_allocator_type>::deallocate(outer_allocator(), __p, __n);
403 _LIBCPP_HIDE_FROM_ABI size_type max_size() const {
404 return allocator_traits<outer_allocator_type>::max_size(outer_allocator());
407 # if _LIBCPP_STD_VER >= 20
408 template <class _Type, class... _Args>
409 _LIBCPP_HIDE_FROM_ABI void construct(_Type* __ptr, _Args&&... __args) {
410 using _OM = __outermost<outer_allocator_type>;
412 [__ptr, this](auto&&... __newargs) {
413 allocator_traits<typename _OM::type>::construct(
414 _OM()(outer_allocator()), __ptr, std::forward<decltype(__newargs)>(__newargs)...);
416 std::uses_allocator_construction_args<_Type>(inner_allocator(), std::forward<_Args>(__args)...));
419 template <class _Tp, class... _Args>
420 _LIBCPP_HIDE_FROM_ABI void construct(_Tp* __p, _Args&&... __args) {
421 __construct(__uses_alloc_ctor<_Tp, inner_allocator_type&, _Args...>(), __p, std::forward<_Args>(__args)...);
424 template <class _T1, class _T2, class... _Args1, class... _Args2>
425 _LIBCPP_HIDE_FROM_ABI void
426 construct(pair<_T1, _T2>* __p, piecewise_construct_t, tuple<_Args1...> __x, tuple<_Args2...> __y) {
427 typedef __outermost<outer_allocator_type> _OM;
428 allocator_traits<typename _OM::type>::construct(
429 _OM()(outer_allocator()),
432 __transform_tuple(typename __uses_alloc_ctor< _T1, inner_allocator_type&, _Args1... >::type(),
434 typename __make_tuple_indices<sizeof...(_Args1)>::type{}),
435 __transform_tuple(typename __uses_alloc_ctor< _T2, inner_allocator_type&, _Args2... >::type(),
437 typename __make_tuple_indices<sizeof...(_Args2)>::type{}));
440 template <class _T1, class _T2>
441 _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p) {
442 construct(__p, piecewise_construct, tuple<>{}, tuple<>{});
445 template <class _T1, class _T2, class _Up, class _Vp>
446 _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p, _Up&& __x, _Vp&& __y) {
449 std::forward_as_tuple(std::forward<_Up>(__x)),
450 std::forward_as_tuple(std::forward<_Vp>(__y)));
453 template <class _T1, class _T2, class _Up, class _Vp>
454 _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x) {
455 construct(__p, piecewise_construct, std::forward_as_tuple(__x.first), std::forward_as_tuple(__x.second));
458 template <class _T1, class _T2, class _Up, class _Vp>
459 _LIBCPP_HIDE_FROM_ABI void construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x) {
462 std::forward_as_tuple(std::forward<_Up>(__x.first)),
463 std::forward_as_tuple(std::forward<_Vp>(__x.second)));
468 _LIBCPP_HIDE_FROM_ABI void destroy(_Tp* __p) {
469 typedef __outermost<outer_allocator_type> _OM;
470 allocator_traits<typename _OM::type>::destroy(_OM()(outer_allocator()), __p);
473 _LIBCPP_HIDE_FROM_ABI scoped_allocator_adaptor select_on_container_copy_construction() const _NOEXCEPT {
474 return _Base::select_on_container_copy_construction();
478 _LIBCPP_HIDE_FROM_ABI explicit scoped_allocator_adaptor(
479 outer_allocator_type&& __o, inner_allocator_type&& __i) _NOEXCEPT : _Base(std::move(__o), std::move(__i)) {}
481 template <class _Tp, class... _Args>
482 _LIBCPP_HIDE_FROM_ABI void __construct(integral_constant<int, 0>, _Tp* __p, _Args&&... __args) {
483 typedef __outermost<outer_allocator_type> _OM;
484 allocator_traits<typename _OM::type>::construct(_OM()(outer_allocator()), __p, std::forward<_Args>(__args)...);
487 template <class _Tp, class... _Args>
488 _LIBCPP_HIDE_FROM_ABI void __construct(integral_constant<int, 1>, _Tp* __p, _Args&&... __args) {
489 typedef __outermost<outer_allocator_type> _OM;
490 allocator_traits<typename _OM::type>::construct(
491 _OM()(outer_allocator()), __p, allocator_arg, inner_allocator(), std::forward<_Args>(__args)...);
494 template <class _Tp, class... _Args>
495 _LIBCPP_HIDE_FROM_ABI void __construct(integral_constant<int, 2>, _Tp* __p, _Args&&... __args) {
496 typedef __outermost<outer_allocator_type> _OM;
497 allocator_traits<typename _OM::type>::construct(
498 _OM()(outer_allocator()), __p, std::forward<_Args>(__args)..., inner_allocator());
501 template <class... _Args, size_t... _Idx>
502 _LIBCPP_HIDE_FROM_ABI tuple<_Args&&...>
503 __transform_tuple(integral_constant<int, 0>, tuple<_Args...>&& __t, __tuple_indices<_Idx...>) {
504 return std::forward_as_tuple(std::get<_Idx>(std::move(__t))...);
507 template <class... _Args, size_t... _Idx>
508 _LIBCPP_HIDE_FROM_ABI tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>
509 __transform_tuple(integral_constant<int, 1>, tuple<_Args...>&& __t, __tuple_indices<_Idx...>) {
510 using _Tup = tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>;
511 return _Tup(allocator_arg, inner_allocator(), std::get<_Idx>(std::move(__t))...);
514 template <class... _Args, size_t... _Idx>
515 _LIBCPP_HIDE_FROM_ABI tuple<_Args&&..., inner_allocator_type&>
516 __transform_tuple(integral_constant<int, 2>, tuple<_Args...>&& __t, __tuple_indices<_Idx...>) {
517 using _Tup = tuple<_Args&&..., inner_allocator_type&>;
518 return _Tup(std::get<_Idx>(std::move(__t))..., inner_allocator());
522 friend class __scoped_allocator_storage;
525 # if _LIBCPP_STD_VER >= 17
526 template <class _OuterAlloc, class... _InnerAllocs>
527 scoped_allocator_adaptor(_OuterAlloc, _InnerAllocs...) -> scoped_allocator_adaptor<_OuterAlloc, _InnerAllocs...>;
530 template <class _OuterA1, class _OuterA2>
531 inline _LIBCPP_HIDE_FROM_ABI bool
532 operator==(const scoped_allocator_adaptor<_OuterA1>& __a, const scoped_allocator_adaptor<_OuterA2>& __b) _NOEXCEPT {
533 return __a.outer_allocator() == __b.outer_allocator();
536 template <class _OuterA1, class _OuterA2, class _InnerA0, class... _InnerAllocs>
537 inline _LIBCPP_HIDE_FROM_ABI bool
538 operator==(const scoped_allocator_adaptor<_OuterA1, _InnerA0, _InnerAllocs...>& __a,
539 const scoped_allocator_adaptor<_OuterA2, _InnerA0, _InnerAllocs...>& __b) _NOEXCEPT {
540 return __a.outer_allocator() == __b.outer_allocator() && __a.inner_allocator() == __b.inner_allocator();
543 # if _LIBCPP_STD_VER <= 17
545 template <class _OuterA1, class _OuterA2, class... _InnerAllocs>
546 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const scoped_allocator_adaptor<_OuterA1, _InnerAllocs...>& __a,
547 const scoped_allocator_adaptor<_OuterA2, _InnerAllocs...>& __b) _NOEXCEPT {
548 return !(__a == __b);
551 # endif // _LIBCPP_STD_VER <= 17
553 #endif // !defined(_LIBCPP_CXX03_LANG)
555 _LIBCPP_END_NAMESPACE_STD
559 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
568 # include <stdexcept>
569 # include <type_traits>
573 #endif // _LIBCPP_SCOPED_ALLOCATOR