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___PSTL_BACKEND_FWD_H
10#define _LIBCPP___PSTL_BACKEND_FWD_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15# pragma GCC system_header
16#endif
17
18_LIBCPP_PUSH_MACROS
19#include <__undef_macros>
20
21//
22// This header declares available PSTL backends and the functions that must be implemented in order for the
23// PSTL algorithms to be provided.
24//
25// Backends often do not implement the full set of functions themselves -- a configuration of the PSTL is
26// usually a set of backends "stacked" together which each implement some algorithms under some execution
27// policies. It is only necessary for the "stack" of backends to implement all algorithms under all execution
28// policies, but a single backend is not required to implement everything on its own.
29//
30// The signatures used by each backend function are documented below.
31//
32// Exception handling
33// ==================
34//
35// PSTL backends are expected to report errors (i.e. failure to allocate) by returning a disengaged `optional` from
36// their implementation. Exceptions shouldn't be used to report an internal failure-to-allocate, since all exceptions
37// are turned into a program termination at the front-end level. When a backend returns a disengaged `optional` to the
38// frontend, the frontend will turn that into a call to `std::__throw_bad_alloc();` to report the internal failure to
39// the user.
40//
41
42#if _LIBCPP_STD_VER >= 17
43
44_LIBCPP_BEGIN_NAMESPACE_STD
45namespace __pstl {
46
47template <class... _Backends>
48struct __backend_configuration;
49
50struct __default_backend_tag;
51struct __libdispatch_backend_tag;
52struct __serial_backend_tag;
53struct __std_thread_backend_tag;
54
55# if defined(_LIBCPP_PSTL_BACKEND_SERIAL)
56using __current_configuration _LIBCPP_NODEBUG = __backend_configuration<__serial_backend_tag, __default_backend_tag>;
57# elif defined(_LIBCPP_PSTL_BACKEND_STD_THREAD)
58using __current_configuration _LIBCPP_NODEBUG =
59 __backend_configuration<__std_thread_backend_tag, __default_backend_tag>;
60# elif defined(_LIBCPP_PSTL_BACKEND_LIBDISPATCH)
61using __current_configuration _LIBCPP_NODEBUG =
62 __backend_configuration<__libdispatch_backend_tag, __default_backend_tag>;
63# else
64
65// ...New vendors can add parallel backends here...
66
67# error "Invalid PSTL backend configuration"
68# endif
69
70template <class _Backend, class _ExecutionPolicy>
71struct __find_if;
72// template <class _Policy, class _ForwardIterator, class _Predicate>
73// optional<_ForwardIterator>
74// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
75
76template <class _Backend, class _ExecutionPolicy>
77struct __find_if_not;
78// template <class _Policy, class _ForwardIterator, class _Predicate>
79// optional<_ForwardIterator>
80// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
81
82template <class _Backend, class _ExecutionPolicy>
83struct __find;
84// template <class _Policy, class _ForwardIterator, class _Tp>
85// optional<_ForwardIterator>
86// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) const noexcept;
87
88template <class _Backend, class _ExecutionPolicy>
89struct __any_of;
90// template <class _Policy, class _ForwardIterator, class _Predicate>
91// optional<bool>
92// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
93
94template <class _Backend, class _ExecutionPolicy>
95struct __all_of;
96// template <class _Policy, class _ForwardIterator, class _Predicate>
97// optional<bool>
98// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
99
100template <class _Backend, class _ExecutionPolicy>
101struct __none_of;
102// template <class _Policy, class _ForwardIterator, class _Predicate>
103// optional<bool>
104// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
105
106template <class _Backend, class _ExecutionPolicy>
107struct __is_partitioned;
108// template <class _Policy, class _ForwardIterator, class _Predicate>
109// optional<bool>
110// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
111
112template <class _Backend, class _ExecutionPolicy>
113struct __find_first_of;
114// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Predicate>
115// optional<_ForwardIterator1>
116// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
117// _ForwardIterator2 __first2, _ForwardIterator2 __last2, _Predicate __pred) const noexcept;
118
119template <class _Backend, class _ExecutionPolicy>
120struct __find_end;
121// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Predicate>
122// optional<_ForwardIterator1>
123// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
124// _ForwardIterator2 __first2, _ForwardIterator2 __last2, _Predicate __pred) const noexcept;
125
126template <class _Backend, class _ExecutionPolicy>
127struct __for_each;
128// template <class _Policy, class _ForwardIterator, class _Function>
129// optional<__empty>
130// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Function __func) const noexcept;
131
132template <class _Backend, class _ExecutionPolicy>
133struct __for_each_n;
134// template <class _Policy, class _ForwardIterator, class _Size, class _Function>
135// optional<__empty>
136// operator()(_Policy&&, _ForwardIterator __first, _Size __size, _Function __func) const noexcept;
137
138template <class _Backend, class _ExecutionPolicy>
139struct __fill;
140// template <class _Policy, class _ForwardIterator, class _Tp>
141// optional<__empty>
142// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Tp const& __value) const noexcept;
143
144template <class _Backend, class _ExecutionPolicy>
145struct __fill_n;
146// template <class _Policy, class _ForwardIterator, class _Size, class _Tp>
147// optional<__empty>
148// operator()(_Policy&&, _ForwardIterator __first, _Size __n, _Tp const& __value) const noexcept;
149
150template <class _Backend, class _ExecutionPolicy>
151struct __search;
152// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
153// optional<_ForwardIterator1>
154// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
155// _ForwardIterator2 __first2, _ForwardIterator2 __last2, _BinaryPredicate __pred) const noexcept;
156
157template <class _Backend, class _ExecutionPolicy>
158struct __replace;
159// template <class _Policy, class _ForwardIterator, class _Tp>
160// optional<__empty>
161// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
162// _Tp const& __old, _Tp const& __new) const noexcept;
163
164template <class _Backend, class _ExecutionPolicy>
165struct __replace_if;
166// template <class _Policy, class _ForwardIterator, class _Predicate, class _Tp>
167// optional<__empty>
168// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
169// _Predicate __pred, _Tp const& __new_value) const noexcept;
170
171template <class _Backend, class _ExecutionPolicy>
172struct __generate;
173// template <class _Policy, class _ForwardIterator, class _Generator>
174// optional<__empty>
175// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Generator __gen) const noexcept;
176
177template <class _Backend, class _ExecutionPolicy>
178struct __generate_n;
179// template <class _Policy, class _ForwardIterator, class _Size, class _Generator>
180// optional<__empty>
181// operator()(_Policy&&, _ForwardIterator __first, _Size __n, _Generator __gen) const noexcept;
182
183template <class _Backend, class _ExecutionPolicy>
184struct __reverse;
185// template <class _Policy, class _BidirectionalIterator>
186// optional<__empty>
187// operator()(_Policy&&, _BidirectionalIterator __first, _BidirectionalIterator __last) const noexcept;
188
189template <class _Backend, class _ExecutionPolicy>
190struct __reverse_copy;
191// template <class _Policy, class _BidirectionalIterator, class _ForwardIterator>
192// optional<_ForwardIterator>
193// operator()(_Policy&&, _BidirectionalIterator __first, _BidirectionalIterator __last,
194// _ForwardIterator __result) const noexcept;
195
196template <class _Backend, class _ExecutionPolicy>
197struct __merge;
198// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _ForwardOutIterator, class _Comp>
199// optional<_ForwardOutIterator>
200// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
201// _ForwardIterator2 __first2, _ForwardIterator2 __last2,
202// _ForwardOutIterator __result, _Comp __comp) const noexcept;
203
204template <class _Backend, class _ExecutionPolicy>
205struct __max_element;
206// template <class _Policy, class _ForwardIterator, class _Compare>
207// optional<_ForwardIterator>
208// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Compare __comp) const noexcept;
209
210template <class _Backend, class _ExecutionPolicy>
211struct __min_element;
212// template <class _Policy, class _ForwardIterator, class _Compare>
213// optional<_ForwardIterator>
214// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Compare __comp) const noexcept;
215
216template <class _Backend, class _ExecutionPolicy>
217struct __minmax_element;
218// template <class _Policy, class _ForwardIterator, class _Compare>
219// optional<pair<_ForwardIterator, _ForwardIterator>>
220// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Compare __comp) const noexcept;
221
222template <class _Backend, class _ExecutionPolicy>
223struct __search_n;
224// template <class _Policy, class _ForwardIterator, class _Size, class _T, class _Predicate>
225// optional<_ForwardIterator>
226// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
227// _Size __count, const _T& __value, _Predicate __pred) const noexcept;
228
229template <class _Backend, class _ExecutionPolicy>
230struct __stable_sort;
231// template <class _Policy, class _RandomAccessIterator, class _Comp>
232// optional<__empty>
233// operator()(_Policy&&, _RandomAccessIterator __first, _RandomAccessIterator __last, _Comp __comp) const noexcept;
234
235template <class _Backend, class _ExecutionPolicy>
236struct __sort;
237// template <class _Policy, class _RandomAccessIterator, class _Comp>
238// optional<__empty>
239// operator()(_Policy&&, _RandomAccessIterator __first, _RandomAccessIterator __last, _Comp __comp) const noexcept;
240
241template <class _Backend, class _ExecutionPolicy>
242struct __transform;
243// template <class _Policy, class _ForwardIterator, class _ForwardOutIterator, class _UnaryOperation>
244// optional<_ForwardOutIterator>
245// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
246// _ForwardOutIterator __result,
247// _UnaryOperation __op) const noexcept;
248
249template <class _Backend, class _ExecutionPolicy>
250struct __transform_binary;
251// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2,
252// class _ForwardOutIterator,
253// class _BinaryOperation>
254// optional<_ForwardOutIterator>
255// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
256// _ForwardIterator2 __first2,
257// _ForwardOutIterator __result,
258// _BinaryOperation __op) const noexcept;
259
260template <class _Backend, class _ExecutionPolicy>
261struct __replace_copy_if;
262// template <class _Policy, class _ForwardIterator, class _ForwardOutIterator, class _Predicate, class _Tp>
263// optional<__empty>
264// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
265// _ForwardOutIterator __out_it,
266// _Predicate __pred,
267// _Tp const& __new_value) const noexcept;
268
269template <class _Backend, class _ExecutionPolicy>
270struct __replace_copy;
271// template <class _Policy, class _ForwardIterator, class _ForwardOutIterator, class _Tp>
272// optional<__empty>
273// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
274// _ForwardOutIterator __out_it,
275// _Tp const& __old_value,
276// _Tp const& __new_value) const noexcept;
277
278template <class _Backend, class _ExecutionPolicy>
279struct __move;
280// template <class _Policy, class _ForwardIterator, class _ForwardOutIterator>
281// optional<_ForwardOutIterator>
282// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
283// _ForwardOutIterator __out_it) const noexcept;
284
285template <class _Backend, class _ExecutionPolicy>
286struct __copy;
287// template <class _Policy, class _ForwardIterator, class _ForwardOutIterator>
288// optional<_ForwardOutIterator>
289// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
290// _ForwardOutIterator __out_it) const noexcept;
291
292template <class _Backend, class _ExecutionPolicy>
293struct __copy_n;
294// template <class _Policy, class _ForwardIterator, class _Size, class _ForwardOutIterator>
295// optional<_ForwardOutIterator>
296// operator()(_Policy&&, _ForwardIterator __first, _Size __n, _ForwardOutIterator __out_it) const noexcept;
297
298template <class _Backend, class _ExecutionPolicy>
299struct __rotate_copy;
300// template <class _Policy, class _ForwardIterator, class _ForwardOutIterator>
301// optional<_ForwardOutIterator>
302// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last,
303// _ForwardOutIterator __out_it) const noexcept;
304
305template <class _Backend, class _ExecutionPolicy>
306struct __transform_reduce;
307// template <class _Policy, class _ForwardIterator, class _Tp, class _BinaryOperation, class _UnaryOperation>
308// optional<_Tp>
309// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
310// _Tp __init,
311// _BinaryOperation __reduce,
312// _UnaryOperation __transform) const noexcept;
313
314template <class _Backend, class _ExecutionPolicy>
315struct __transform_reduce_binary;
316// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2,
317// class _Tp, class _BinaryOperation1, class _BinaryOperation2>
318// optional<_Tp> operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
319// _ForwardIterator2 __first2,
320// _Tp __init,
321// _BinaryOperation1 __reduce,
322// _BinaryOperation2 __transform) const noexcept;
323
324template <class _Backend, class _ExecutionPolicy>
325struct __count_if;
326// template <class _Policy, class _ForwardIterator, class _Predicate>
327// optional<__iter_diff_t<_ForwardIterator>>
328// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) const noexcept;
329
330template <class _Backend, class _ExecutionPolicy>
331struct __count;
332// template <class _Policy, class _ForwardIterator, class _Tp>
333// optional<__iter_diff_t<_ForwardIterator>>
334// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last, _Tp const& __value) const noexcept;
335
336template <class _Backend, class _ExecutionPolicy>
337struct __equal_3leg;
338// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Predicate>
339// optional<bool>
340// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
341// _ForwardIterator2 __first2,
342// _Predicate __pred) const noexcept;
343
344template <class _Backend, class _ExecutionPolicy>
345struct __equal;
346// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Predicate>
347// optional<bool>
348// operator()(_Policy&&, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
349// _ForwardIterator2 __first2, _ForwardIterator2 __last2,
350// _Predicate __pred) const noexcept;
351
352template <class _Backend, class _ExecutionPolicy>
353struct __reduce;
354// template <class _Policy, class _ForwardIterator, class _Tp, class _BinaryOperation>
355// optional<_Tp>
356// operator()(_Policy&&, _ForwardIterator __first, _ForwardIterator __last,
357// _Tp __init, _BinaryOperation __op) const noexcept;
358
359template <class _Backend, class _ExecutionPolicy>
360struct __is_heap;
361// template <class _Policy, class _RandomAccessIterator, class _Comp>
362// optional<bool>
363// operator()(_Policy&& __policy, _RandomAccessIterator __first, _RandomAccessIterator __last,
364// _Comp __comp) const noexcept;
365
366template <class _Backend, class _ExecutionPolicy>
367struct __is_heap_until;
368// template <class _Policy, class _RandomAccessIterator, class _Comp>
369// optional<_RandomAccessIterator>
370// operator()(_Policy&& __policy, _RandomAccessIterator __first, _RandomAccessIterator __last,
371// _Comp __comp) const noexcept;
372
373template <class _Backend, class _ExecutionPolicy>
374struct __is_sorted;
375// template <class _Policy, class _ForwardIterator, class _Comp>
376// optional<bool>
377// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Comp&& __comp) const noexcept;
378
379template <class _Backend, class _ExecutionPolicy>
380struct __is_sorted_until;
381// template <class _Policy, class _ForwardIterator, class _Comp>
382// optional<_ForwardIterator>
383// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Comp&& __comp) const noexcept;
384
385template <class _Backend, class _ExecutionPolicy>
386struct __adjacent_difference;
387// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _BinaryOperation>
388// optional<_ForwardIterator2>
389// operator()(_Policy&& __policy, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
390// _ForwardIterator2 __first2, _BinaryOperation &&__op) const noexcept;
391
392template <class _Backend, class _ExecutionPolicy>
393struct __mismatch;
394// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Comp>
395// optional<pair<_ForwardIterator1, _ForwardIterator2>>
396// operator()(_Policy&& __policy, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
397// _ForwardIterator2 __first2, _ForwardIterator2 __last2,
398// _Comp __comp) const noexcept;
399
400template <class _Backend, class _ExecutionPolicy>
401struct __mismatch_3leg;
402// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Comp>
403// optional<pair<_ForwardIterator1, _ForwardIterator2>>
404// operator()(_Policy&& __policy, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
405// _ForwardIterator2 __first2, _Comp __comp) const noexcept;
406
407template <class _Backend, class _ExecutionPolicy>
408struct __adjacent_find;
409// template <class _Policy, class _ForwardIterator, class _BinaryPredicate>
410// optional<_ForwardIterator>
411// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last,
412// _BinaryPredicate __predicate) const noexcept;
413
414template <class _Backend, class _ExecutionPolicy>
415struct __lexicographical_compare;
416// template <class _Policy, class _ForwardIterator1, class _ForwardIterator2, class _Comp>
417// optional<bool>
418// operator()(_Policy&& __policy, _ForwardIterator1 __first1, _ForwardIterator1 __last1,
419// _ForwardIterator2 __first2, _ForwardIterator2 __last2, _Comp __comp) const noexcept;
420
421template <class _Backend, class _ExecutionPolicy>
422struct __destroy;
423// template <class _Policy, class _ForwardIterator>
424// optional<__empty>
425// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last) const noexcept;
426
427template <class _Backend, class _ExecutionPolicy>
428struct __destroy_n;
429// template <class _Policy, class _ForwardIterator, class _Size>
430// optional<__empty>
431// operator()(_Policy&& __policy, _ForwardIterator __first, _Size __n) const noexcept;
432
433template <class _Backend, class _ExecutionPolicy>
434struct __uninitialized_copy;
435// template <class _Policy, class _InputIterator, class _ForwardIterator>
436// optional<_ForwardIterator>
437// operator()(_Policy&& __policy, _InputIterator __first, _InputIterator __last, _ForwardIterator __result) const
438// noexcept;
439
440template <class _Backend, class _ExecutionPolicy>
441struct __uninitialized_copy_n;
442// template <class _Policy, class _InputIterator, class _Size, class _ForwardIterator>
443// optional<_ForwardIterator>
444// operator()(_Policy&& __policy, _InputIterator __first, _Size __n, _ForwardIterator __result) const
445// noexcept;
446
447template <class _Backend, class _ExecutionPolicy>
448struct __uninitialized_default_construct;
449// template <class _Policy, class _ForwardIterator>
450// optional<__empty>
451// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last) const noexcept;
452
453template <class _Backend, class _ExecutionPolicy>
454struct __uninitialized_default_construct_n;
455// template <class _Policy, class _ForwardIterator, class _Size>
456// optional<__empty>
457// operator()(_Policy&& __policy, _ForwardIterator __first, _Size __n) const noexcept;
458
459template <class _Backend, class _ExecutionPolicy>
460struct __uninitialized_move;
461// template <class _Policy, class _InputIterator, class _ForwardIterator>
462// optional<_ForwardIterator>
463// operator()(_Policy&& __policy, _InputIterator __first, _InputIterator __last, _ForwardIterator __result) const
464// noexcept;
465
466template <class _Backend, class _ExecutionPolicy>
467struct __uninitialized_move_n;
468// template <class _Policy, class _InputIterator, class _Size, class _ForwardIterator>
469// optional<pair<_InputIterator, _ForwardIterator>>
470// operator()(_Policy&& __policy, _InputIterator __first, _Size __n, _ForwardIterator __result) const
471// noexcept;
472
473template <class _Backend, class _ExecutionPolicy>
474struct __uninitialized_value_construct;
475// template <class _Policy, class _ForwardIterator>
476// optional<__empty>
477// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last) const noexcept;
478
479template <class _Backend, class _ExecutionPolicy>
480struct __uninitialized_value_construct_n;
481// template <class _Policy, class _ForwardIterator, class _Size>
482// optional<__empty>
483// operator()(_Policy&& __policy, _ForwardIterator __first, _Size __n) const noexcept;
484
485template <class _Backend, class _ExecutionPolicy>
486struct __uninitialized_fill;
487// template <class _Policy, class _ForwardIterator, class _Tp>
488// optional<__empty>
489// operator()(_Policy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp &__value) const noexcept;
490
491template <class _Backend, class _ExecutionPolicy>
492struct __uninitialized_fill_n;
493// template <class _Policy, class _ForwardIterator, class _Size, class _Tp>
494// optional<__empty>
495// operator()(_Policy&& __policy, _ForwardIterator __first, _Size __n, const _Tp &__value) const noexcept;
496
497} // namespace __pstl
498_LIBCPP_END_NAMESPACE_STD
499
500#endif // _LIBCPP_STD_VER >= 17
501
502_LIBCPP_POP_MACROS
503
504#endif // _LIBCPP___PSTL_BACKEND_FWD_H
505