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Fix std::experimental::shared_ptr SFINAE constraints
[thirdparty/gcc.git] / libstdc++-v3 / include / experimental / bits / shared_ptr.h
CommitLineData
930d5602
FY		 1// Experimental shared_ptr with array support -*- C++ -*-
2
818ab71a 3// Copyright (C) 2015-2016 Free Software Foundation, Inc.
930d5602
FY		 4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file experimental/bits/shared_ptr.h
26 * This is an internal header file, included by other library headers.
011b25e4 27 * Do not attempt to use it directly. @headername{experimental/memory}
930d5602
FY		 28 */
29
30#ifndef _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H
31#define _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H 1
32
33#pragma GCC system_header
34
35#if __cplusplus <= 201103L
36# include <bits/c++14_warning.h>
37#else
38
39#include <memory>
40#include <experimental/type_traits>
41
42namespace std _GLIBCXX_VISIBILITY(default)
43{
44namespace experimental
45{
46inline namespace fundamentals_v2
47{
48_GLIBCXX_BEGIN_NAMESPACE_VERSION
49 template<typename _Tp> class enable_shared_from_this;
50_GLIBCXX_END_NAMESPACE_VERSION
51} // namespace fundamentals_v2
52} // namespace experimental
53
54#define __cpp_lib_experimental_shared_ptr_arrays 201406
55
56_GLIBCXX_BEGIN_NAMESPACE_VERSION
57
58 /*
59 * The specification of std::experimental::shared_ptr is slightly different
011b25e4 60 * to std::shared_ptr (specifically in terms of "compatible" pointers) so
930d5602
FY		 61 * to implement std::experimental::shared_ptr without too much duplication
62 * we make it derive from a partial specialization of std::__shared_ptr
63 * using a special tag type, __libfund_v1.
64 *
65 * There are two partial specializations for the tag type, supporting the
66 * different interfaces of the array and non-array forms.
67 */
68
69 template <typename _Tp, bool = is_array<_Tp>::value>
70 struct __libfund_v1 { using type = _Tp; };
71
930d5602
FY		 72 // Partial specialization for base class of experimental::shared_ptr<T>
73 // (i.e. the non-array form of experimental::shared_ptr)
74 template<typename _Tp, _Lock_policy _Lp>
75 class __shared_ptr<__libfund_v1<_Tp, false>, _Lp>
76 : private __shared_ptr<_Tp, _Lp>
77 {
84870b6b
JW		 78 // For non-arrays, Y* is compatible with T* if Y* is convertible to T*.
79 template<typename _Yp, typename _Res = void>
930d5602 80 using _Compatible
84870b6b
JW		 81 = enable_if_t<experimental::is_convertible_v<_Yp*, _Tp*>, _Res>;
82
83 template<typename _Yp, typename _Del,
84 typename _Ptr = typename unique_ptr<_Yp, _Del>::pointer,
85 typename _Res = void>
86 using _UniqCompatible = enable_if_t<
87 experimental::is_convertible_v<_Yp*, _Tp*>
88 && experimental::is_convertible_v<_Ptr, _Tp*>,
89 _Res>;
930d5602
FY		 90
91 using _Base_type = __shared_ptr<_Tp>;
92
84870b6b
JW		 93 _Base_type& _M_get_base() { return *this; }
94 const _Base_type& _M_get_base() const { return *this; }
930d5602
FY		 95
96 public:
97 using element_type = _Tp;
98
99 constexpr __shared_ptr() noexcept = default;
100
84870b6b
JW		 101 template<typename _Tp1, typename = _Compatible<_Tp1>>
102 explicit
103 __shared_ptr(_Tp1* __p)
930d5602
FY		 104 : _Base_type(__p)
105 { }
106
84870b6b 107 template<typename _Tp1, typename _Deleter, typename = _Compatible<_Tp1>>
930d5602
FY		 108 __shared_ptr(_Tp1* __p, _Deleter __d)
109 : _Base_type(__p, __d)
110 { }
111
84870b6b
JW		 112 template<typename _Tp1, typename _Deleter, typename _Alloc,
113 typename = _Compatible<_Tp1>>
930d5602
FY		 114 __shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a)
115 : _Base_type(__p, __d, __a)
116 { }
117
118 template<typename _Deleter>
119 __shared_ptr(nullptr_t __p, _Deleter __d)
120 : _Base_type(__p, __d)
121 { }
122
123 template<typename _Deleter, typename _Alloc>
124 __shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)
125 : _Base_type(__p, __d, __a)
126 { }
127
128 template<typename _Tp1>
129 __shared_ptr(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r,
130 element_type* __p) noexcept
131 : _Base_type(__r._M_get_base(), __p)
132 { }
133
134 __shared_ptr(const __shared_ptr&) noexcept = default;
135 __shared_ptr(__shared_ptr&&) noexcept = default;
136 __shared_ptr& operator=(const __shared_ptr&) noexcept = default;
137 __shared_ptr& operator=(__shared_ptr&&) noexcept = default;
138 ~__shared_ptr() = default;
139
140 template<typename _Tp1, typename = _Compatible<_Tp1>>
141 __shared_ptr(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
142 : _Base_type(__r._M_get_base())
143 { }
144
145 template<typename _Tp1, typename = _Compatible<_Tp1>>
146 __shared_ptr(__shared_ptr<__libfund_v1<_Tp1>, _Lp>&& __r) noexcept
147 : _Base_type(std::move((__r._M_get_base())))
148 { }
149
84870b6b
JW		 150 template<typename _Tp1, typename = _Compatible<_Tp1>>
151 explicit
152 __shared_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r)
930d5602
FY		 153 : _Base_type(__r._M_get_base())
154 { }
155
84870b6b
JW		 156 template<typename _Tp1, typename _Del,
157 typename = _UniqCompatible<_Tp1, _Del>>
158 __shared_ptr(unique_ptr<_Tp1, _Del>&& __r)
159 : _Base_type(std::move(__r))
160 { }
930d5602
FY		 161
162#if _GLIBCXX_USE_DEPRECATED
163 // Postcondition: use_count() == 1 and __r.get() == 0
84870b6b 164 template<typename _Tp1, typename = _Compatible<_Tp1>>
930d5602
FY		 165 __shared_ptr(std::auto_ptr<_Tp1>&& __r)
166 : _Base_type(std::move(__r))
167 { }
168#endif
169
170 constexpr __shared_ptr(nullptr_t) noexcept : __shared_ptr() { }
171
172 // reset
173 void
174 reset() noexcept
175 { __shared_ptr(nullptr).swap(*this); }
176
177 template<typename _Tp1>
84870b6b 178 _Compatible<_Tp1>
930d5602
FY		 179 reset(_Tp1* __p)
180 {
181 _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != get());
182 __shared_ptr(__p).swap(*this);
183 }
184
185 template<typename _Tp1, typename _Deleter>
84870b6b 186 _Compatible<_Tp1>
930d5602
FY		 187 reset(_Tp1* __p, _Deleter __d)
188 { __shared_ptr(__p, __d).swap(*this); }
189
190 template<typename _Tp1, typename _Deleter, typename _Alloc>
84870b6b 191 _Compatible<_Tp1>
930d5602
FY		 192 reset(_Tp1* __p, _Deleter __d, _Alloc __a)
193 { __shared_ptr(__p, __d, std::move(__a)).swap(*this); }
194
195 using _Base_type::operator*;
196 using _Base_type::operator->;
197
198 template<typename _Tp1>
aca12aff 199 _Compatible<_Tp1, __shared_ptr&>
930d5602
FY		 200 operator=(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
201 {
202 _Base_type::operator=(__r._M_get_base());
203 return *this;
204 }
205
206 template<class _Tp1>
aca12aff 207 _Compatible<_Tp1, __shared_ptr&>
930d5602
FY		 208 operator=(__shared_ptr<__libfund_v1<_Tp1>, _Lp>&& __r) noexcept
209 {
210 _Base_type::operator=(std::move(__r._M_get_base()));
211 return *this;
212 }
213
84870b6b
JW		 214 template<typename _Tp1, typename _Del>
215 _UniqCompatible<_Tp1, _Del, __shared_ptr&>
216 operator=(unique_ptr<_Tp1, _Del>&& __r)
930d5602
FY		 217 {
218 _Base_type::operator=(std::move(__r));
219 return *this;
220 }
221
222#if _GLIBCXX_USE_DEPRECATED
223 template<typename _Tp1>
aca12aff 224 _Compatible<_Tp1, __shared_ptr&>
930d5602
FY		 225 operator=(std::auto_ptr<_Tp1>&& __r)
226 {
227 _Base_type::operator=(std::move(__r));
228 return *this;
229 }
230#endif
231
232 void
233 swap(__shared_ptr& __other) noexcept
234 { _Base_type::swap(__other); }
235
236 template<typename _Tp1>
237 bool
238 owner_before(__shared_ptr<__libfund_v1<_Tp1>, _Lp> const& __rhs) const
239 { return _Base_type::owner_before(__rhs._M_get_base()); }
240
241 template<typename _Tp1>
242 bool
243 owner_before(__weak_ptr<__libfund_v1<_Tp1>, _Lp> const& __rhs) const
244 { return _Base_type::owner_before(__rhs._M_get_base()); }
245
246 using _Base_type::operator bool;
247 using _Base_type::get;
248 using _Base_type::unique;
249 using _Base_type::use_count;
250
251 protected:
252
253 // make_shared not yet support for shared_ptr_arrays
254 //template<typename _Alloc, typename... _Args>
255 // __shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a,
256 // _Args&&... __args)
257 // : _M_ptr(), _M_refcount(__tag, (_Tp*)0, __a,
258 // std::forward<_Args>(__args)...)
259 // {
260 // void* __p = _M_refcount._M_get_deleter(typeid(__tag));
261 // _M_ptr = static_cast<_Tp*>(__p);
262 // __enable_shared_from_this_helper(_M_refcount, _M_ptr, _M_ptr);
263 // }
264
265 // __weak_ptr::lock()
266 __shared_ptr(const __weak_ptr<__libfund_v1<_Tp>, _Lp>& __r,
267 std::nothrow_t)
268 : _Base_type(__r._M_get_base(), std::nothrow)
269 { }
270
271 private:
272 template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
273 template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
274
275 // TODO
276 template<typename _Del, typename _Tp1, _Lock_policy _Lp1>
277 friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&) noexcept;
278 };
279
84870b6b
JW		 280 // Helper traits for shared_ptr of array:
281
282 // Trait that tests if Y* is compatible with T*, for shared_ptr purposes.
283 template<typename _Yp, typename _Tp>
284 struct __sp_compatible
285 : is_convertible<_Yp*, _Tp*>::type
286 { };
287
288 template<size_t _Nm, typename _Tp>
289 struct __sp_compatible<_Tp[_Nm], _Tp[]>
290 : true_type
291 { };
292
293 template<size_t _Nm, typename _Tp>
294 struct __sp_compatible<_Tp[_Nm], const _Tp[]>
295 : true_type
296 { };
297
298 template<typename _Yp, typename _Tp>
299 constexpr bool __sp_compatible_v
300 = __sp_compatible<_Yp, _Tp>::value;
301
302 // Test conversion from Y(*)[N] to U(*)[N] without forming invalid type Y[N].
303 template<typename _Up, size_t _Nm, typename _Yp, typename = void>
304 struct __sp_is_constructible_arrN
305 : false_type
306 { };
307
308 template<typename _Up, size_t _Nm, typename _Yp>
309 struct __sp_is_constructible_arrN<_Up, _Nm, _Yp, __void_t<_Yp[_Nm]>>
310 : is_convertible<_Yp(*)[_Nm], _Up(*)[_Nm]>::type
311 { };
312
313 // Test conversion from Y(*)[] to U(*)[] without forming invalid type Y[].
314 template<typename _Up, typename _Yp, typename = void>
315 struct __sp_is_constructible_arr
316 : false_type
317 { };
318
319 template<typename _Up, typename _Yp>
320 struct __sp_is_constructible_arr<_Up, _Yp, __void_t<_Yp[]>>
321 : is_convertible<_Yp(*)[], _Up(*)[]>::type
322 { };
323
324 // Trait to check if shared_ptr<T> can be constructed from Y*.
325 template<typename _Tp, typename _Yp>
326 struct __sp_is_constructible;
327
328 // When T is U[N], Y(*)[N] shall be convertible to T*;
329 template<typename _Up, size_t _Nm, typename _Yp>
330 struct __sp_is_constructible<_Up[_Nm], _Yp>
331 : __sp_is_constructible_arrN<_Up, _Nm, _Yp>::type
332 { };
333
334 // when T is U[], Y(*)[] shall be convertible to T*;
335 template<typename _Up, typename _Yp>
336 struct __sp_is_constructible<_Up[], _Yp>
337 : __sp_is_constructible_arr<_Up, _Yp>::type
338 { };
339
340 // otherwise, Y* shall be convertible to T*.
341 template<typename _Tp, typename _Yp>
342 struct __sp_is_constructible
343 : is_convertible<_Yp*, _Tp*>::type
344 { };
345
346 template<typename _Tp, typename _Yp>
347 constexpr bool __sp_is_constructible_v
348 = __sp_is_constructible<_Tp, _Yp>::value;
349
350
930d5602
FY		 351 // Partial specialization for base class of experimental::shared_ptr<T[N]>
352 // and experimental::shared_ptr<T[]> (i.e. the array forms).
353 template<typename _Tp, _Lock_policy _Lp>
354 class __shared_ptr<__libfund_v1<_Tp, true>, _Lp>
355 : private __shared_ptr<remove_extent_t<_Tp>, _Lp>
356 {
357 public:
358 using element_type = remove_extent_t<_Tp>;
359
360 private:
aca12aff 361 struct _Array_deleter
930d5602
FY		 362 {
363 void
364 operator()(element_type const *__p) const
365 { delete [] __p; }
366 };
367
84870b6b
JW		 368 // Constraint for constructing/resetting with a pointer of type _Yp*:
369 template<typename _Yp>
370 using _SafeConv = enable_if_t<__sp_is_constructible_v<_Tp, _Yp>>;
371
372 // Constraint for constructing/assigning from smart_pointer<_Tp1>:
aca12aff 373 template<typename _Tp1, typename _Res = void>
84870b6b
JW		 374 using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>;
375
376 // Constraint for constructing/assigning from unique_ptr<_Tp1, _Del>:
377 template<typename _Tp1, typename _Del,
378 typename _Ptr = typename unique_ptr<_Tp1, _Del>::pointer,
379 typename _Res = void>
380 using _UniqCompatible = enable_if_t<
381 __sp_compatible_v<_Tp1, _Tp>
382 && experimental::is_convertible_v<_Ptr, element_type*>,
383 _Res>;
930d5602
FY		 384
385 using _Base_type = __shared_ptr<element_type>;
386
84870b6b
JW		 387 _Base_type& _M_get_base() { return *this; }
388 const _Base_type& _M_get_base() const { return *this; }
930d5602
FY		 389
390 public:
391 constexpr __shared_ptr() noexcept
392 : _Base_type()
393 { }
394
84870b6b
JW		 395 template<typename _Tp1, typename = _SafeConv<_Tp1>>
396 explicit
397 __shared_ptr(_Tp1* __p)
aca12aff 398 : _Base_type(__p, _Array_deleter())
930d5602
FY		 399 { }
400
84870b6b 401 template<typename _Tp1, typename _Deleter, typename = _SafeConv<_Tp1>>
930d5602
FY		 402 __shared_ptr(_Tp1* __p, _Deleter __d)
403 : _Base_type(__p, __d)
404 { }
405
84870b6b
JW		 406 template<typename _Tp1, typename _Deleter, typename _Alloc,
407 typename = _SafeConv<_Tp1>>
930d5602
FY		 408 __shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a)
409 : _Base_type(__p, __d, __a)
410 { }
411
412 template<typename _Deleter>
413 __shared_ptr(nullptr_t __p, _Deleter __d)
414 : _Base_type(__p, __d)
415 { }
416
417 template<typename _Deleter, typename _Alloc>
418 __shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)
419 : _Base_type(__p, __d, __a)
420 { }
421
422 template<typename _Tp1>
423 __shared_ptr(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r,
424 element_type* __p) noexcept
425 : _Base_type(__r._M_get_base(), __p)
426 { }
427
428 __shared_ptr(const __shared_ptr&) noexcept = default;
429 __shared_ptr(__shared_ptr&&) noexcept = default;
430 __shared_ptr& operator=(const __shared_ptr&) noexcept = default;
431 __shared_ptr& operator=(__shared_ptr&&) noexcept = default;
432 ~__shared_ptr() = default;
433
434 template<typename _Tp1, typename = _Compatible<_Tp1>>
435 __shared_ptr(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
436 : _Base_type(__r._M_get_base())
437 { }
438
439 template<typename _Tp1, typename = _Compatible<_Tp1>>
440 __shared_ptr(__shared_ptr<__libfund_v1<_Tp1>, _Lp>&& __r) noexcept
441 : _Base_type(std::move((__r._M_get_base())))
442 { }
443
84870b6b
JW		 444 template<typename _Tp1, typename = _Compatible<_Tp1>>
445 explicit
446 __shared_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r)
930d5602
FY		 447 : _Base_type(__r._M_get_base())
448 { }
449
84870b6b
JW		 450 template<typename _Tp1, typename _Del,
451 typename = _UniqCompatible<_Tp1, _Del>>
452 __shared_ptr(unique_ptr<_Tp1, _Del>&& __r)
453 : _Base_type(std::move(__r))
454 { }
930d5602
FY		 455
456#if _GLIBCXX_USE_DEPRECATED
457 // Postcondition: use_count() == 1 and __r.get() == 0
84870b6b
JW		 458 template<typename _Tp1, typename = _Compatible<_Tp1>>
459 __shared_ptr(auto_ptr<_Tp1>&& __r)
930d5602
FY		 460 : _Base_type(std::move(__r))
461 { }
462#endif
463
464 constexpr __shared_ptr(nullptr_t) noexcept : __shared_ptr() { }
465
466 // reset
467 void
468 reset() noexcept
469 { __shared_ptr(nullptr).swap(*this); }
470
471 template<typename _Tp1>
84870b6b 472 _SafeConv<_Tp1>
930d5602
FY		 473 reset(_Tp1* __p)
474 {
475 _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != get());
aca12aff 476 __shared_ptr(__p, _Array_deleter()).swap(*this);
930d5602
FY		 477 }
478
479 template<typename _Tp1, typename _Deleter>
84870b6b 480 _SafeConv<_Tp1>
930d5602
FY		 481 reset(_Tp1* __p, _Deleter __d)
482 { __shared_ptr(__p, __d).swap(*this); }
483
484 template<typename _Tp1, typename _Deleter, typename _Alloc>
84870b6b 485 _SafeConv<_Tp1>
930d5602
FY		 486 reset(_Tp1* __p, _Deleter __d, _Alloc __a)
487 { __shared_ptr(__p, __d, std::move(__a)).swap(*this); }
488
489 element_type&
490 operator[](ptrdiff_t i) const noexcept
491 {
492 _GLIBCXX_DEBUG_ASSERT(get() != 0 && i >= 0);
493 return get()[i];
494 }
495
496 template<typename _Tp1>
aca12aff 497 _Compatible<_Tp1, __shared_ptr&>
930d5602
FY		 498 operator=(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
499 {
500 _Base_type::operator=(__r._M_get_base());
501 return *this;
502 }
503
504 template<class _Tp1>
aca12aff 505 _Compatible<_Tp1, __shared_ptr&>
930d5602
FY		 506 operator=(__shared_ptr<__libfund_v1<_Tp1>, _Lp>&& __r) noexcept
507 {
508 _Base_type::operator=(std::move(__r._M_get_base()));
509 return *this;
510 }
511
84870b6b
JW		 512 template<typename _Tp1, typename _Del>
513 _UniqCompatible<_Tp1, _Del, __shared_ptr&>
514 operator=(unique_ptr<_Tp1, _Del>&& __r)
930d5602
FY		 515 {
516 _Base_type::operator=(std::move(__r));
517 return *this;
518 }
519
520#if _GLIBCXX_USE_DEPRECATED
521 template<typename _Tp1>
aca12aff 522 _Compatible<_Tp1, __shared_ptr&>
84870b6b 523 operator=(auto_ptr<_Tp1>&& __r)
930d5602
FY		 524 {
525 _Base_type::operator=(std::move(__r));
526 return *this;
527 }
528#endif
529
530 void
531 swap(__shared_ptr& __other) noexcept
532 { _Base_type::swap(__other); }
533
534 template<typename _Tp1>
535 bool
536 owner_before(__shared_ptr<__libfund_v1<_Tp1>, _Lp> const& __rhs) const
537 { return _Base_type::owner_before(__rhs._M_get_base()); }
538
539 template<typename _Tp1>
540 bool
541 owner_before(__weak_ptr<__libfund_v1<_Tp1>, _Lp> const& __rhs) const
542 { return _Base_type::owner_before(__rhs._M_get_base()); }
543
544 using _Base_type::operator bool;
545 using _Base_type::get;
546 using _Base_type::unique;
547 using _Base_type::use_count;
548
549 protected:
550
551 // make_shared not yet support for shared_ptr_arrays
552 //template<typename _Alloc, typename... _Args>
553 // __shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a,
554 // _Args&&... __args)
555 // : _M_ptr(), _M_refcount(__tag, (_Tp*)0, __a,
556 // std::forward<_Args>(__args)...)
557 // {
558 // void* __p = _M_refcount._M_get_deleter(typeid(__tag));
559 // _M_ptr = static_cast<_Tp*>(__p);
560 // __enable_shared_from_this_helper(_M_refcount, _M_ptr, _M_ptr);
561 // }
562
563 // __weak_ptr::lock()
564 __shared_ptr(const __weak_ptr<__libfund_v1<_Tp>, _Lp>& __r,
565 std::nothrow_t)
566 : _Base_type(__r._M_get_base(), std::nothrow)
567 { }
568
569 private:
570 template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
571 template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
572
573 // TODO
574 template<typename _Del, typename _Tp1, _Lock_policy _Lp1>
575 friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&) noexcept;
576 };
577
578 // weak_ptr specialization for __shared_ptr array
579 template<typename _Tp, _Lock_policy _Lp>
580 class __weak_ptr<__libfund_v1<_Tp>, _Lp>
581 : __weak_ptr<remove_extent_t<_Tp>, _Lp>
582 {
aca12aff
JW		 583 template<typename _Tp1, typename _Res = void>
584 using _Compatible
84870b6b 585 = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>;
930d5602
FY		 586
587 using _Base_type = __weak_ptr<remove_extent_t<_Tp>>;
588
84870b6b 589 _Base_type& _M_get_base() { return *this; }
930d5602
FY		 590 const _Base_type& _M_get_base() const { return *this; }
591
592 public:
593 using element_type = remove_extent_t<_Tp>;
594
595 constexpr __weak_ptr() noexcept
596 : _Base_type()
597 { }
598
599 __weak_ptr(const __weak_ptr&) noexcept = default;
600
601 ~__weak_ptr() = default;
602
603 template<typename _Tp1, typename = _Compatible<_Tp1>>
604 __weak_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
605 : _Base_type(__r._M_get_base())
606 { }
607
608 template<typename _Tp1, typename = _Compatible<_Tp1>>
609 __weak_ptr(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
610 : _Base_type(__r._M_get_base())
611 { }
612
613 __weak_ptr(__weak_ptr&& __r) noexcept
614 : _Base_type(std::move(__r))
615 { }
616
617 template<typename _Tp1, typename = _Compatible<_Tp1>>
618 __weak_ptr(__weak_ptr<__libfund_v1<_Tp1>, _Lp>&& __r) noexcept
619 : _Base_type(std::move(__r._M_get_base()))
620 { }
621
622 __weak_ptr&
623 operator=(const __weak_ptr& __r) noexcept = default;
624
625 template<typename _Tp1>
aca12aff 626 _Compatible<_Tp1, __weak_ptr&>
930d5602
FY		 627 operator=(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r) noexcept
628 {
629 this->_Base_type::operator=(__r._M_get_base());
630 return *this;
631 }
632
633 template<typename _Tp1>
aca12aff 634 _Compatible<_Tp1, __weak_ptr&>
930d5602
FY		 635 operator=(const __shared_ptr<_Tp1, _Lp>& __r) noexcept
636 {
637 this->_Base_type::operator=(__r._M_get_base());
638 return *this;
639 }
640
641 __weak_ptr&
642 operator=(__weak_ptr&& __r) noexcept
643 {
644 this->_Base_type::operator=(std::move(__r));
645 return *this;
646 }
647
648 template<typename _Tp1>
aca12aff 649 _Compatible<_Tp1, __weak_ptr&>
930d5602
FY		 650 operator=(__weak_ptr<_Tp1, _Lp>&& __r) noexcept
651 {
652 this->_Base_type::operator=(std::move(__r._M_get_base()));
653 return *this;
654 }
655
656 void
657 swap(__weak_ptr& __other) noexcept
658 { this->_Base_type::swap(__other); }
659
660 template<typename _Tp1>
661 bool
662 owner_before(const __shared_ptr<__libfund_v1<_Tp1>, _Lp>& __rhs) const
663 { return _Base_type::owner_before(__rhs._M_get_base()); }
664
665 template<typename _Tp1>
666 bool
667 owner_before(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __rhs) const
668 { return _Base_type::owner_before(__rhs._M_get_base()); }
669
670 __shared_ptr<__libfund_v1<_Tp>, _Lp>
671 lock() const noexcept // should not be element_type
672 { return __shared_ptr<__libfund_v1<_Tp>, _Lp>(*this, std::nothrow); }
673
674 using _Base_type::use_count;
675 using _Base_type::expired;
676 using _Base_type::reset;
677
678 private:
679 // Used by __enable_shared_from_this.
680 void
681 _M_assign(element_type* __ptr,
682 const __shared_count<_Lp>& __refcount) noexcept
683 { this->_Base_type::_M_assign(__ptr, __refcount); }
684
685 template<typename _Tp1, _Lock_policy _Lp1> friend class __shared_ptr;
686 template<typename _Tp1, _Lock_policy _Lp1> friend class __weak_ptr;
687 friend class __enable_shared_from_this<_Tp, _Lp>;
688 friend class experimental::enable_shared_from_this<_Tp>;
689 friend class enable_shared_from_this<_Tp>;
690 };
691
692_GLIBCXX_END_NAMESPACE_VERSION
693
694namespace experimental
695{
696inline namespace fundamentals_v2
697{
698_GLIBCXX_BEGIN_NAMESPACE_VERSION
699
700 // 8.2.1
701
702 template<typename _Tp> class shared_ptr;
703 template<typename _Tp> class weak_ptr;
704
705 template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
706 using __shared_ptr = std::__shared_ptr<__libfund_v1<_Tp>, _Lp>;
707
708 template<typename _Tp, _Lock_policy _Lp = __default_lock_policy>
709 using __weak_ptr = std::__weak_ptr<__libfund_v1<_Tp>, _Lp>;
710
711 template<typename _Tp>
712 class shared_ptr : public __shared_ptr<_Tp>
713 {
84870b6b
JW		 714 using _Base_type = __shared_ptr<_Tp>;
715
716 public:
717 using element_type = typename _Base_type::element_type;
718
719 private:
720 // Constraint for construction from a pointer of type _Yp*:
721 template<typename _Yp>
722 using _SafeConv = enable_if_t<__sp_is_constructible_v<_Tp, _Yp>>;
723
aca12aff
JW		 724 template<typename _Tp1, typename _Res = void>
725 using _Compatible
84870b6b 726 = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>;
930d5602 727
84870b6b
JW		 728 template<typename _Tp1, typename _Del,
729 typename _Ptr = typename unique_ptr<_Tp1, _Del>::pointer,
730 typename _Res = void>
731 using _UniqCompatible = enable_if_t<
732 __sp_compatible_v<_Tp1, _Tp>
733 && experimental::is_convertible_v<_Ptr, element_type*>,
734 _Res>;
930d5602
FY		 735
736 public:
930d5602
FY		 737
738 // 8.2.1.1, shared_ptr constructors
739 constexpr shared_ptr() noexcept = default;
740
84870b6b
JW		 741 template<typename _Tp1, typename = _SafeConv<_Tp1>>
742 explicit
743 shared_ptr(_Tp1* __p) : _Base_type(__p) { }
930d5602 744
84870b6b 745 template<typename _Tp1, typename _Deleter, typename = _SafeConv<_Tp1>>
930d5602
FY		 746 shared_ptr(_Tp1* __p, _Deleter __d)
747 : _Base_type(__p, __d) { }
748
84870b6b
JW		 749 template<typename _Tp1, typename _Deleter, typename _Alloc,
750 typename = _SafeConv<_Tp1>>
930d5602
FY		 751 shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a)
752 : _Base_type(__p, __d, __a) { }
753
754 template<typename _Deleter>
755 shared_ptr(nullptr_t __p, _Deleter __d)
756 : _Base_type(__p, __d) { }
757
758 template<typename _Deleter, typename _Alloc>
759 shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a)
760 : _Base_type(__p, __d, __a) { }
761
762 template<typename _Tp1>
763 shared_ptr(const shared_ptr<_Tp1>& __r, element_type* __p) noexcept
764 : _Base_type(__r, __p) { }
765
766 shared_ptr(const shared_ptr& __r) noexcept
767 : _Base_type(__r) { }
768
769 template<typename _Tp1, typename = _Compatible<_Tp1>>
770 shared_ptr(const shared_ptr<_Tp1>& __r) noexcept
771 : _Base_type(__r) { }
772
8a9ff71f 773 shared_ptr(shared_ptr&& __r) noexcept
930d5602
FY		 774 : _Base_type(std::move(__r)) { }
775
776 template<typename _Tp1, typename = _Compatible<_Tp1>>
777 shared_ptr(shared_ptr<_Tp1>&& __r) noexcept
778 : _Base_type(std::move(__r)) { }
779
84870b6b
JW		 780 template<typename _Tp1, typename = _Compatible<_Tp1>>
781 explicit
782 shared_ptr(const weak_ptr<_Tp1>& __r)
930d5602
FY		 783 : _Base_type(__r) { }
784
785#if _GLIBCXX_USE_DEPRECATED
84870b6b 786 template<typename _Tp1, typename = _Compatible<_Tp1>>
930d5602 787 shared_ptr(std::auto_ptr<_Tp1>&& __r)
84870b6b 788 : _Base_type(std::move(__r)) { }
930d5602
FY		 789#endif
790
84870b6b
JW		 791 template<typename _Tp1, typename _Del,
792 typename = _UniqCompatible<_Tp1, _Del>>
793 shared_ptr(unique_ptr<_Tp1, _Del>&& __r)
930d5602
FY		 794 : _Base_type(std::move(__r)) { }
795
796 constexpr shared_ptr(nullptr_t __p)
797 : _Base_type(__p) { }
798
799 // C++14 §20.8.2.2
800 ~shared_ptr() = default;
801
802 // C++14 §20.8.2.3
803 shared_ptr& operator=(const shared_ptr&) noexcept = default;
804
805 template <typename _Tp1>
aca12aff 806 _Compatible<_Tp1, shared_ptr&>
930d5602
FY		 807 operator=(const shared_ptr<_Tp1>& __r) noexcept
808 {
809 _Base_type::operator=(__r);
810 return *this;
811 }
812
813 shared_ptr&
814 operator=(shared_ptr&& __r) noexcept
815 {
816 _Base_type::operator=(std::move(__r));
817 return *this;
818 }
819
820 template <typename _Tp1>
aca12aff 821 _Compatible<_Tp1, shared_ptr&>
930d5602
FY		 822 operator=(shared_ptr<_Tp1>&& __r) noexcept
823 {
824 _Base_type::operator=(std::move(__r));
825 return *this;
826 }
827
828#if _GLIBCXX_USE_DEPRECATED
829 template<typename _Tp1>
aca12aff 830 _Compatible<_Tp1, shared_ptr&>
930d5602
FY		 831 operator=(std::auto_ptr<_Tp1>&& __r)
832 {
833 __shared_ptr<_Tp>::operator=(std::move(__r));
834 return *this;
835 }
836#endif
837
838 template <typename _Tp1, typename _Del>
84870b6b 839 _UniqCompatible<_Tp1, _Del, shared_ptr&>
930d5602
FY		 840 operator=(unique_ptr<_Tp1, _Del>&& __r)
841 {
842 _Base_type::operator=(std::move(__r));
843 return *this;
844 }
845
846 // C++14 §20.8.2.2.4
847 // swap & reset
848 // 8.2.1.2 shared_ptr observers
849 // in __shared_ptr
850
851 private:
852 template<typename _Alloc, typename... _Args>
84870b6b
JW		 853 shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a,
854 _Args&&... __args)
855 : _Base_type(__tag, __a, std::forward<_Args>(__args)...)
856 { }
930d5602
FY		 857
858 template<typename _Tp1, typename _Alloc, typename... _Args>
859 friend shared_ptr<_Tp1>
860 allocate_shared(const _Alloc& __a, _Args&&... __args);
861
862 shared_ptr(const weak_ptr<_Tp>& __r, std::nothrow_t)
863 : _Base_type(__r, std::nothrow) { }
864
865 friend class weak_ptr<_Tp>;
866 };
867
868 // C++14 §20.8.2.2.7 //DOING
6dddab08
JW		 869 template<typename _Tp1, typename _Tp2>
870 bool operator==(const shared_ptr<_Tp1>& __a,
871 const shared_ptr<_Tp2>& __b) noexcept
872 { return __a.get() == __b.get(); }
873
874 template<typename _Tp>
875 inline bool
876 operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
877 { return !__a; }
878
879 template<typename _Tp>
880 inline bool
881 operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
882 { return !__a; }
883
884 template<typename _Tp1, typename _Tp2>
885 inline bool
886 operator!=(const shared_ptr<_Tp1>& __a,
930d5602 887 const shared_ptr<_Tp2>& __b) noexcept
6dddab08
JW		 888 { return __a.get() != __b.get(); }
889
890 template<typename _Tp>
891 inline bool
892 operator!=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
893 { return (bool)__a; }
894
895 template<typename _Tp>
896 inline bool
897 operator!=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
898 { return (bool)__a; }
899
900 template<typename _Tp1, typename _Tp2>
901 inline bool
902 operator<(const shared_ptr<_Tp1>& __a,
903 const shared_ptr<_Tp2>& __b) noexcept
904 {
905 using __elem_t1 = typename shared_ptr<_Tp1>::element_type;
906 using __elem_t2 = typename shared_ptr<_Tp2>::element_type;
907 using _CT = common_type_t<__elem_t1*, __elem_t2*>;
908 return std::less<_CT>()(__a.get(), __b.get());
909 }
910
911 template<typename _Tp>
912 inline bool
913 operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
914 {
915 using __elem_t = typename shared_ptr<_Tp>::element_type;
916 return std::less<__elem_t*>()(__a.get(), nullptr);
917 }
918
919 template<typename _Tp>
920 inline bool
921 operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
922 {
923 using __elem_t = typename shared_ptr<_Tp>::element_type;
924 return std::less<__elem_t*>()(nullptr, __a.get());
925 }
926
927 template<typename _Tp1, typename _Tp2>
928 inline bool
929 operator<=(const shared_ptr<_Tp1>& __a,
930d5602 930 const shared_ptr<_Tp2>& __b) noexcept
6dddab08
JW		 931 { return !(__b < __a); }
932
933 template<typename _Tp>
934 inline bool
935 operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
936 { return !(nullptr < __a); }
937
938 template<typename _Tp>
939 inline bool
940 operator<=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
941 { return !(__a < nullptr); }
942
943 template<typename _Tp1, typename _Tp2>
944 inline bool
945 operator>(const shared_ptr<_Tp1>& __a,
946 const shared_ptr<_Tp2>& __b) noexcept
947 { return (__b < __a); }
948
949 template<typename _Tp>
950 inline bool
951 operator>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
952 {
953 using __elem_t = typename shared_ptr<_Tp>::element_type;
954 return std::less<__elem_t*>()(nullptr, __a.get());
955 }
956
957 template<typename _Tp>
958 inline bool
959 operator>(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
960 {
961 using __elem_t = typename shared_ptr<_Tp>::element_type;
962 return std::less<__elem_t*>()(__a.get(), nullptr);
963 }
964
965 template<typename _Tp1, typename _Tp2>
966 inline bool
967 operator>=(const shared_ptr<_Tp1>& __a,
968 const shared_ptr<_Tp2>& __b) noexcept
969 { return !(__a < __b); }
970
971 template<typename _Tp>
972 inline bool
973 operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
974 { return !(__a < nullptr); }
975
976 template<typename _Tp>
977 inline bool
978 operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
979 { return !(nullptr < __a); }
980
981 // C++14 §20.8.2.2.8
982 template<typename _Tp>
983 inline void
984 swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b) noexcept
985 { __a.swap(__b); }
986
987 // 8.2.1.3, shared_ptr casts
988 template<typename _Tp, typename _Tp1>
989 inline shared_ptr<_Tp>
990 static_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept
991 {
992 using __elem_t = typename shared_ptr<_Tp>::element_type;
993 return shared_ptr<_Tp>(__r, static_cast<__elem_t*>(__r.get()));
994 }
995
996 template<typename _Tp, typename _Tp1>
997 inline shared_ptr<_Tp>
998 dynamic_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept
999 {
1000 using __elem_t = typename shared_ptr<_Tp>::element_type;
1001 if (_Tp* __p = dynamic_cast<__elem_t*>(__r.get()))
1002 return shared_ptr<_Tp>(__r, __p);
1003 return shared_ptr<_Tp>();
1004 }
1005
1006 template<typename _Tp, typename _Tp1>
1007 inline shared_ptr<_Tp>
1008 const_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept
1009 {
1010 using __elem_t = typename shared_ptr<_Tp>::element_type;
1011 return shared_ptr<_Tp>(__r, const_cast<__elem_t*>(__r.get()));
1012 }
1013
1014 template<typename _Tp, typename _Tp1>
1015 inline shared_ptr<_Tp>
1016 reinterpret_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept
1017 {
1018 using __elem_t = typename shared_ptr<_Tp>::element_type;
1019 return shared_ptr<_Tp>(__r, reinterpret_cast<__elem_t*>(__r.get()));
1020 }
1021
1022 // C++14 §20.8.2.3
1023 template<typename _Tp>
1024 class weak_ptr : public __weak_ptr<_Tp>
1025 {
aca12aff 1026 template<typename _Tp1, typename _Res = void>
84870b6b 1027 using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>;
930d5602
FY		 1028
1029 using _Base_type = __weak_ptr<_Tp>;
1030
6dddab08 1031 public:
930d5602
FY		 1032 constexpr weak_ptr() noexcept = default;
1033
1034 template<typename _Tp1, typename = _Compatible<_Tp1>>
1035 weak_ptr(const shared_ptr<_Tp1>& __r) noexcept
1036 : _Base_type(__r) { }
1037
1038 weak_ptr(const weak_ptr&) noexcept = default;
1039
1040 template<typename _Tp1, typename = _Compatible<_Tp1>>
1041 weak_ptr(const weak_ptr<_Tp1>& __r) noexcept
1042 : _Base_type(__r) { }
1043
1044 weak_ptr(weak_ptr&&) noexcept = default;
1045
1046 template<typename _Tp1, typename = _Compatible<_Tp1>>
1047 weak_ptr(weak_ptr<_Tp1>&& __r) noexcept
1048 : _Base_type(std::move(__r)) { }
1049
1050 weak_ptr&
1051 operator=(const weak_ptr& __r) noexcept = default;
1052
1053 template<typename _Tp1>
aca12aff 1054 _Compatible<_Tp1, weak_ptr&>
930d5602
FY		 1055 operator=(const weak_ptr<_Tp1>& __r) noexcept
1056 {
1057 this->_Base_type::operator=(__r);
1058 return *this;
1059 }
1060
1061 template<typename _Tp1>
aca12aff 1062 _Compatible<_Tp1, weak_ptr&>
930d5602
FY		 1063 operator=(const shared_ptr<_Tp1>& __r) noexcept
1064 {
1065 this->_Base_type::operator=(__r);
1066 return *this;
1067 }
1068
1069 weak_ptr&
1070 operator=(weak_ptr&& __r) noexcept = default;
1071
1072 template<typename _Tp1>
aca12aff 1073 _Compatible<_Tp1, weak_ptr&>
930d5602
FY		 1074 operator=(weak_ptr<_Tp1>&& __r) noexcept
1075 {
1076 this->_Base_type::operator=(std::move(__r));
1077 return *this;
1078 }
1079
1080 shared_ptr<_Tp>
1081 lock() const noexcept
1082 { return shared_ptr<_Tp>(*this, std::nothrow); }
1083
1084 friend class enable_shared_from_this<_Tp>;
6dddab08 1085 };
930d5602 1086
6dddab08
JW		 1087 // C++14 §20.8.2.3.6
1088 template<typename _Tp>
1089 inline void
1090 swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) noexcept
1091 { __a.swap(__b); }
930d5602
FY		 1092
1093 /// C++14 §20.8.2.2.10
1094 template<typename _Del, typename _Tp, _Lock_policy _Lp>
1095 inline _Del*
1096 get_deleter(const __shared_ptr<_Tp, _Lp>& __p) noexcept
1097 { return std::get_deleter<_Del>(__p); }
1098
1099 // C++14 §20.8.2.2.11
1100 template<typename _Ch, typename _Tr, typename _Tp, _Lock_policy _Lp>
1101 inline std::basic_ostream<_Ch, _Tr>&
1102 operator<<(std::basic_ostream<_Ch, _Tr>& __os,
1103 const __shared_ptr<_Tp, _Lp>& __p)
1104 {
1105 __os << __p.get();
1106 return __os;
1107 }
1108
6dddab08
JW		 1109 // C++14 §20.8.2.4
1110 template<typename _Tp = void> class owner_less;
930d5602
FY		 1111
1112 /// Partial specialization of owner_less for shared_ptr.
1113 template<typename _Tp>
1114 struct owner_less<shared_ptr<_Tp>>
1115 : public _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>>
1116 { };
1117
1118 /// Partial specialization of owner_less for weak_ptr.
1119 template<typename _Tp>
1120 struct owner_less<weak_ptr<_Tp>>
1121 : public _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>>
1122 { };
1123
1124 template<>
1125 class owner_less<void>
1126 {
1127 template<typename _Tp, typename _Up>
1128 bool
1129 operator()(shared_ptr<_Tp> const& __lhs,
1130 shared_ptr<_Up> const& __rhs) const
1131 { return __lhs.owner_before(__rhs); }
1132
1133 template<typename _Tp, typename _Up>
1134 bool
1135 operator()(shared_ptr<_Tp> const& __lhs,
1136 weak_ptr<_Up> const& __rhs) const
1137 { return __lhs.owner_before(__rhs); }
1138
1139 template<typename _Tp, typename _Up>
1140 bool
1141 operator()(weak_ptr<_Tp> const& __lhs,
1142 shared_ptr<_Up> const& __rhs) const
1143 { return __lhs.owner_before(__rhs); }
1144
1145 template<typename _Tp, typename _Up>
1146 bool
1147 operator()(weak_ptr<_Tp> const& __lhs,
1148 weak_ptr<_Up> const& __rhs) const
1149 { return __lhs.owner_before(__rhs); }
1150
1151 typedef void is_transparent;
1152 };
1153
1154 // C++14 §20.8.2.6
1155 template<typename _Tp>
1156 inline bool
1157 atomic_is_lock_free(const shared_ptr<_Tp>* __p)
1158 { return std::atomic_is_lock_free<_Tp, __default_lock_policy>(__p); }
1159
1160 template<typename _Tp>
1161 shared_ptr<_Tp> atomic_load(const shared_ptr<_Tp>* __p)
1162 { return std::atomic_load<_Tp>(__p); }
1163
1164 template<typename _Tp>
1165 shared_ptr<_Tp>
1166 atomic_load_explicit(const shared_ptr<_Tp>* __p, memory_order __mo)
1167 { return std::atomic_load_explicit<_Tp>(__p, __mo); }
1168
1169 template<typename _Tp>
1170 void atomic_store(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r)
1171 { return std::atomic_store<_Tp>(__p, __r); }
1172
1173 template<typename _Tp>
1174 shared_ptr<_Tp>
1175 atomic_store_explicit(const shared_ptr<_Tp>* __p,
1176 shared_ptr<_Tp> __r,
1177 memory_order __mo)
1178 { return std::atomic_store_explicit<_Tp>(__p, __r, __mo); }
1179
1180 template<typename _Tp>
1181 void atomic_exchange(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r)
1182 { return std::atomic_exchange<_Tp>(__p, __r); }
1183
1184 template<typename _Tp>
1185 shared_ptr<_Tp>
1186 atomic_exchange_explicit(const shared_ptr<_Tp>* __p,
1187 shared_ptr<_Tp> __r,
1188 memory_order __mo)
1189 { return std::atomic_exchange_explicit<_Tp>(__p, __r, __mo); }
1190
1191 template<typename _Tp>
1192 bool atomic_compare_exchange_weak(shared_ptr<_Tp>* __p,
1193 shared_ptr<_Tp>* __v,
1194 shared_ptr<_Tp> __w)
1195 { return std::atomic_compare_exchange_weak<_Tp>(__p, __v, __w); }
1196
1197 template<typename _Tp>
1198 bool atomic_compare_exchange_strong(shared_ptr<_Tp>* __p,
1199 shared_ptr<_Tp>* __v,
1200 shared_ptr<_Tp> __w)
1201 { return std::atomic_compare_exchange_strong<_Tp>(__p, __v, __w); }
1202
1203 template<typename _Tp>
1204 bool atomic_compare_exchange_weak_explicit(shared_ptr<_Tp>* __p,
1205 shared_ptr<_Tp>* __v,
1206 shared_ptr<_Tp> __w,
1207 memory_order __success,
1208 memory_order __failure)
1209 { return std::atomic_compare_exchange_weak_explicit<_Tp>(__p, __v, __w,
1210 __success,
1211 __failure); }
1212
1213 template<typename _Tp>
1214 bool atomic_compare_exchange_strong_explicit(shared_ptr<_Tp>* __p,
1215 shared_ptr<_Tp>* __v,
1216 shared_ptr<_Tp> __w,
1217 memory_order __success,
1218 memory_order __failure)
1219 { return std::atomic_compare_exchange_strong_explicit<_Tp>(__p, __v, __w,
1220 __success,
1221 __failure); }
1222
1223 //enable_shared_from_this
1224 template<typename _Tp>
1225 class enable_shared_from_this
1226 {
1227 protected:
1228 constexpr enable_shared_from_this() noexcept { }
1229
1230 enable_shared_from_this(const enable_shared_from_this&) noexcept { }
1231
1232 enable_shared_from_this&
1233 operator=(const enable_shared_from_this&) noexcept
1234 { return *this; }
1235
1236 ~enable_shared_from_this() { }
1237
1238 public:
1239 shared_ptr<_Tp>
1240 shared_from_this()
1241 { return shared_ptr<_Tp>(this->_M_weak_this); }
1242
1243 shared_ptr<const _Tp>
1244 shared_from_this() const
1245 { return shared_ptr<const _Tp>(this->_M_weak_this); }
1246
84870b6b
JW		 1247 weak_ptr<_Tp>
1248 weak_from_this() noexcept
1249 { return _M_weak_this; }
1250
1251 weak_ptr<const _Tp>
1252 weak_from_this() const noexcept
1253 { return _M_weak_this; }
1254
930d5602
FY		 1255 private:
1256 template<typename _Tp1>
1257 void
1258 _M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const noexcept
1259 { _M_weak_this._M_assign(__p, __n); }
1260
1261 template<typename _Tp1>
1262 friend void
1263 __enable_shared_from_this_helper(const __shared_count<>& __pn,
1264 const enable_shared_from_this* __pe,
1265 const _Tp1* __px) noexcept
1266 {
1267 if(__pe != 0)
1268 __pe->_M_weak_assign(const_cast<_Tp1*>(__px), __pn);
1269 }
1270
1271 mutable weak_ptr<_Tp> _M_weak_this;
1272 };
1273
1274_GLIBCXX_END_NAMESPACE_VERSION
1275} // namespace fundamentals_v2
1276} // namespace experimental
1277
1278_GLIBCXX_BEGIN_NAMESPACE_VERSION
1279
1280 /// std::hash specialization for shared_ptr.
1281 template<typename _Tp>
1282 struct hash<experimental::shared_ptr<_Tp>>
1283 : public __hash_base<size_t, experimental::shared_ptr<_Tp>>
1284 {
1285 size_t
1286 operator()(const experimental::shared_ptr<_Tp>& __s) const noexcept
1287 { return std::hash<_Tp*>()(__s.get()); }
1288 };
1289
1290_GLIBCXX_END_NAMESPACE_VERSION
1291} // namespace std
1292
1293#endif // __cplusplus <= 201103L
1294
1295#endif // _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H
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