29#ifndef _GLIBCXX_FUTURE
30#define _GLIBCXX_FUTURE 1
33#pragma GCC system_header
38#if __cplusplus < 201103L
54#include <bits/uses_allocator.h>
57namespace std _GLIBCXX_VISIBILITY(default)
59_GLIBCXX_BEGIN_NAMESPACE_VERSION
78 future_already_retrieved = 1,
79 promise_already_satisfied,
89 [[__nodiscard__, __gnu__::__const__]]
101 inline error_condition
118 virtual ~future_error()
noexcept;
124 code() const noexcept {
return _M_code; }
129 :
logic_error(
"std::future_error: " + __ec.message()), _M_code(__ec)
132 friend void __throw_future_error(
int);
138 template<
typename _Res>
141 template<
typename _Res>
144 template<
typename _Signature>
147 template<
typename _Res>
160 return static_cast<launch>(
161 static_cast<int>(__x) &
static_cast<int>(__y));
167 return static_cast<launch>(
168 static_cast<int>(__x) |
static_cast<int>(__y));
174 return static_cast<launch>(
175 static_cast<int>(__x) ^
static_cast<int>(__y));
180 {
return static_cast<launch>(~static_cast<int>(__x)); }
184 {
return __x = __x & __y; }
188 {
return __x = __x | __y; }
192 {
return __x = __x ^ __y; }
205 template<
typename _Fn,
typename... _Args>
206 using __async_result_of =
typename __invoke_result<
207 typename decay<_Fn>::type,
typename decay<_Args>::type...>::type;
210 template<
typename _Fn,
typename... _Args>
211 future<__async_result_of<_Fn, _Args...>>
212 async(
launch __policy, _Fn&& __fn, _Args&&... __args);
214 template<
typename _Fn,
typename... _Args>
215 future<__async_result_of<_Fn, _Args...>>
216 async(_Fn&& __fn, _Args&&... __args);
218#if defined(_GLIBCXX_HAS_GTHREADS)
228 exception_ptr _M_error;
230 _Result_base(
const _Result_base&) =
delete;
231 _Result_base& operator=(
const _Result_base&) =
delete;
234 virtual void _M_destroy() = 0;
238 void operator()(_Result_base* __fr)
const { __fr->_M_destroy(); }
243 virtual ~_Result_base();
247 template<
typename _Res>
248 using _Ptr = unique_ptr<_Res, _Result_base::_Deleter>;
251 template<
typename _Res>
252 struct _Result : _Result_base
255 __gnu_cxx::__aligned_buffer<_Res> _M_storage;
259 typedef _Res result_type;
261 _Result() noexcept : _M_initialized() { }
271 _M_value() noexcept {
return *_M_storage._M_ptr(); }
274 _M_set(
const _Res& __res)
276 ::new (_M_storage._M_addr()) _Res(__res);
277 _M_initialized = true;
283 ::new (_M_storage._M_addr()) _Res(std::move(__res));
284 _M_initialized = true;
288 void _M_destroy() {
delete this; }
292 template<
typename _Res,
typename _Alloc>
293 struct _Result_alloc final : _Result<_Res>, _Alloc
295 using __allocator_type = __alloc_rebind<_Alloc, _Result_alloc>;
298 _Result_alloc(
const _Alloc& __a) : _Result<_Res>(), _Alloc(__a)
304 __allocator_type __a(*
this);
305 __allocated_ptr<__allocator_type> __guard_ptr{ __a,
this };
306 this->~_Result_alloc();
311 template<
typename _Res,
typename _Allocator>
312 static _Ptr<_Result_alloc<_Res, _Allocator>>
313 _S_allocate_result(
const _Allocator& __a)
315 using __result_type = _Result_alloc<_Res, _Allocator>;
316 typename __result_type::__allocator_type __a2(__a);
317 auto __guard = std::__allocate_guarded(__a2);
318 __result_type* __p = ::new((
void*)__guard.get()) __result_type{__a};
320 return _Ptr<__result_type>(__p);
324 template<
typename _Res,
typename _Tp>
325 static _Ptr<_Result<_Res>>
326 _S_allocate_result(
const std::allocator<_Tp>&)
328 return _Ptr<_Result<_Res>>(
new _Result<_Res>);
336 typedef _Ptr<_Result_base> _Ptr_type;
338 enum _Status :
unsigned {
344 __atomic_futex_unsigned<> _M_status;
345 atomic_flag _M_retrieved = ATOMIC_FLAG_INIT;
349 _State_baseV2() noexcept : _M_result(), _M_status(_Status::__not_ready)
351 _State_baseV2(
const _State_baseV2&) =
delete;
352 _State_baseV2& operator=(
const _State_baseV2&) =
delete;
353 virtual ~_State_baseV2() =
default;
362 _M_status._M_load_when_equal(_Status::__ready, memory_order_acquire);
366 template<
typename _Rep,
typename _Period>
368 wait_for(
const chrono::duration<_Rep, _Period>& __rel)
372 if (_M_status._M_load(memory_order_acquire) == _Status::__ready)
373 return future_status::ready;
375 if (_M_is_deferred_future())
376 return future_status::deferred;
379 if (__rel > __rel.zero()
380 && _M_status._M_load_when_equal_for(_Status::__ready,
381 memory_order_acquire,
395 return future_status::ready;
397 return future_status::timeout;
400 template<
typename _Clock,
typename _Duration>
402 wait_until(
const chrono::time_point<_Clock, _Duration>& __abs)
404#if __cplusplus > 201703L
405 static_assert(chrono::is_clock_v<_Clock>);
409 if (_M_status._M_load(memory_order_acquire) == _Status::__ready)
410 return future_status::ready;
412 if (_M_is_deferred_future())
413 return future_status::deferred;
415 if (_M_status._M_load_when_equal_until(_Status::__ready,
416 memory_order_acquire,
424 return future_status::ready;
426 return future_status::timeout;
432 _M_set_result(function<_Ptr_type()> __res,
bool __ignore_failure =
false)
434 bool __did_set =
false;
437 call_once(_M_once, &_State_baseV2::_M_do_set,
this,
441 _M_status._M_store_notify_all(_Status::__ready,
442 memory_order_release);
443 else if (!__ignore_failure)
444 __throw_future_error(
int(future_errc::promise_already_satisfied));
451 _M_set_delayed_result(function<_Ptr_type()> __res,
452 weak_ptr<_State_baseV2> __self)
454 bool __did_set =
false;
455 unique_ptr<_Make_ready> __mr{
new _Make_ready};
458 call_once(_M_once, &_State_baseV2::_M_do_set,
this,
461 __throw_future_error(
int(future_errc::promise_already_satisfied));
462 __mr->_M_shared_state =
std::move(__self);
469 _M_break_promise(_Ptr_type __res)
471 if (
static_cast<bool>(__res))
479 _M_result.swap(__res);
481 _M_status._M_store_notify_all(_Status::__ready,
482 memory_order_release);
488 _M_set_retrieved_flag()
490 if (_M_retrieved.test_and_set())
491 __throw_future_error(
int(future_errc::future_already_retrieved));
494 template<
typename _Res,
typename _Arg>
498 template<
typename _Res,
typename _Arg>
499 struct _Setter<_Res, _Arg&>
503 static_assert(is_same<_Res, _Arg&>::value
504 || is_same<const _Res, _Arg>::value,
505 "Invalid specialisation");
508 typename promise<_Res>::_Ptr_type operator()()
const
510 _M_promise->_M_storage->_M_set(*_M_arg);
511 return std::move(_M_promise->_M_storage);
513 promise<_Res>* _M_promise;
518 template<
typename _Res>
519 struct _Setter<_Res, _Res&&>
522 typename promise<_Res>::_Ptr_type operator()()
const
524 _M_promise->_M_storage->_M_set(
std::move(*_M_arg));
525 return std::move(_M_promise->_M_storage);
527 promise<_Res>* _M_promise;
532 template<
typename _Res>
533 struct _Setter<_Res, void>
535 static_assert(is_void<_Res>::value,
"Only used for promise<void>");
537 typename promise<_Res>::_Ptr_type operator()() const noexcept
538 {
return std::move(_M_promise->_M_storage); }
540 promise<_Res>* _M_promise;
543 struct __exception_ptr_tag { };
546 template<
typename _Res>
547 struct _Setter<_Res, __exception_ptr_tag>
550 typename promise<_Res>::_Ptr_type operator()() const noexcept
552 _M_promise->_M_storage->_M_error = *_M_ex;
553 return std::move(_M_promise->_M_storage);
556 promise<_Res>* _M_promise;
557 exception_ptr* _M_ex;
560 template<
typename _Res,
typename _Arg>
561 __attribute__((__always_inline__))
562 static _Setter<_Res, _Arg&&>
563 __setter(promise<_Res>* __prom, _Arg&& __arg)
noexcept
568 template<
typename _Res>
569 __attribute__((__always_inline__))
570 static _Setter<_Res, __exception_ptr_tag>
571 __setter(exception_ptr& __ex, promise<_Res>* __prom)
noexcept
573 __glibcxx_assert(__ex !=
nullptr);
574 return _Setter<_Res, __exception_ptr_tag>{ __prom, &__ex };
577 template<
typename _Res>
578 __attribute__((__always_inline__))
579 static _Setter<_Res, void>
580 __setter(promise<_Res>* __prom)
noexcept
582 return _Setter<_Res, void>{ __prom };
585 template<
typename _Tp>
587 _S_check(
const shared_ptr<_Tp>& __p)
589 if (!
static_cast<bool>(__p))
590 __throw_future_error((
int)future_errc::no_state);
596 _M_do_set(function<_Ptr_type()>* __f,
bool* __did_set)
598 _Ptr_type __res = (*__f)();
603 _M_result.swap(__res);
607 virtual void _M_complete_async() { }
610 virtual bool _M_is_deferred_future()
const {
return false; }
612 struct _Make_ready final : __at_thread_exit_elt
614 weak_ptr<_State_baseV2> _M_shared_state;
615 static void _S_run(
void*);
620#ifdef _GLIBCXX_ASYNC_ABI_COMPAT
622 class _Async_state_common;
624 using _State_base = _State_baseV2;
625 class _Async_state_commonV2;
628 template<
typename _BoundFn,
630 class _Deferred_state;
632 template<
typename _BoundFn,
634 class _Async_state_impl;
636 template<
typename _Signature>
637 struct _Task_state_base;
639 template<
typename _Fn,
typename _Alloc,
typename _Signature>
642 template<
typename _Res_ptr,
typename _Fn,
643 typename _Res =
typename _Res_ptr::element_type::result_type>
646 template<
typename _Res_ptr,
typename _BoundFn>
647 static _Task_setter<_Res_ptr, _BoundFn>
648 _S_task_setter(_Res_ptr& __ptr, _BoundFn& __call)
655 template<
typename _Res>
656 struct __future_base::_Result<_Res&> : __future_base::_Result_base
658 typedef _Res& result_type;
660 _Result() noexcept : _M_value_ptr() { }
663 _M_set(_Res& __res)
noexcept
666 _Res& _M_get() noexcept {
return *_M_value_ptr; }
671 void _M_destroy() {
delete this; }
676 struct __future_base::_Result<void> : __future_base::_Result_base
678 typedef void result_type;
681 void _M_destroy() {
delete this; }
686#ifndef _GLIBCXX_ASYNC_ABI_COMPAT
690 template<
typename _Res,
typename _Arg>
691 struct __is_location_invariant
692 <__future_base::_State_base::_Setter<_Res, _Arg>>
696 template<
typename _Res_ptr,
typename _Fn,
typename _Res>
697 struct __is_location_invariant
698 <__future_base::_Task_setter<_Res_ptr, _Fn, _Res>>
703 template<
typename _Res>
704 class __basic_future :
public __future_base
708 typedef __future_base::_Result<_Res>& __result_type;
711 __state_type _M_state;
715 __basic_future(
const __basic_future&) =
delete;
716 __basic_future& operator=(
const __basic_future&) =
delete;
719 valid()
const noexcept {
return static_cast<bool>(_M_state); }
724 _State_base::_S_check(_M_state);
728 template<
typename _Rep,
typename _Period>
732 _State_base::_S_check(_M_state);
733 return _M_state->wait_for(__rel);
736 template<
typename _Clock,
typename _Duration>
740 _State_base::_S_check(_M_state);
741 return _M_state->wait_until(__abs);
749 _State_base::_S_check(_M_state);
750 _Result_base& __res = _M_state->wait();
751 if (!(__res._M_error ==
nullptr))
753 return static_cast<__result_type
>(__res);
758 _M_state.
swap(__that._M_state);
763 __basic_future(
const __state_type& __state) : _M_state(__state)
765 _State_base::_S_check(_M_state);
766 _M_state->_M_set_retrieved_flag();
771 __basic_future(
const shared_future<_Res>&)
noexcept;
775 __basic_future(shared_future<_Res>&&) noexcept;
779 __basic_future(future<_Res>&&) noexcept;
781 constexpr __basic_future() noexcept : _M_state() { }
785 explicit _Reset(__basic_future& __fut) noexcept : _M_fut(__fut) { }
786 ~_Reset() { _M_fut._M_state.reset(); }
787 __basic_future& _M_fut;
793 template<
typename _Res>
794 class future :
public __basic_future<_Res>
798 static_assert(!
is_array<_Res>{},
"result type must not be an array");
801 "result type must be destructible");
804 template<
typename>
friend class packaged_task;
805 template<
typename _Fn,
typename... _Args>
806 friend future<__async_result_of<_Fn, _Args...>>
807 async(
launch, _Fn&&, _Args&&...);
809 typedef __basic_future<_Res> _Base_type;
810 typedef typename _Base_type::__state_type __state_type;
813 future(
const __state_type& __state) : _Base_type(__state) { }
816 constexpr future() noexcept : _Base_type() { }
835 typename _Base_type::_Reset __reset(*
this);
843 template<typename _Res>
844 class future<_Res&> : public __basic_future<_Res&>
847 template<
typename>
friend class packaged_task;
848 template<
typename _Fn,
typename... _Args>
849 friend future<__async_result_of<_Fn, _Args...>>
850 async(
launch, _Fn&&, _Args&&...);
852 typedef __basic_future<_Res&> _Base_type;
853 typedef typename _Base_type::__state_type __state_type;
856 future(
const __state_type& __state) : _Base_type(__state) { }
859 constexpr future() noexcept : _Base_type() { }
878 typename _Base_type::_Reset __reset(*
this);
887 class future<
void> : public __basic_future<
void>
890 template<
typename>
friend class packaged_task;
891 template<
typename _Fn,
typename... _Args>
892 friend future<__async_result_of<_Fn, _Args...>>
893 async(
launch, _Fn&&, _Args&&...);
895 typedef __basic_future<void> _Base_type;
896 typedef typename _Base_type::__state_type __state_type;
899 future(
const __state_type& __state) : _Base_type(__state) { }
902 constexpr future() noexcept : _Base_type() { }
921 typename _Base_type::_Reset __reset(*
this);
930 template<typename _Res>
931 class shared_future : public __basic_future<_Res>
935 static_assert(!
is_array<_Res>{},
"result type must not be an array");
938 "result type must be destructible");
940 typedef __basic_future<_Res> _Base_type;
943 constexpr shared_future() noexcept : _Base_type() { }
964 shared_future& operator=(shared_future&& __sf)
noexcept
966 shared_future(
std::move(__sf))._M_swap(*
this);
976 template<
typename _Res>
977 class shared_future<_Res&> :
public __basic_future<_Res&>
979 typedef __basic_future<_Res&> _Base_type;
982 constexpr shared_future() noexcept : _Base_type() { }
1003 shared_future& operator=(shared_future&& __sf)
noexcept
1005 shared_future(
std::move(__sf))._M_swap(*
this);
1016 class shared_future<void> :
public __basic_future<void>
1018 typedef __basic_future<void> _Base_type;
1021 constexpr shared_future() noexcept : _Base_type() { }
1042 shared_future& operator=(shared_future&& __sf)
noexcept
1044 shared_future(
std::move(__sf))._M_swap(*
this);
1050 get()
const { this->_M_get_result(); }
1054 template<
typename _Res>
1055 inline __basic_future<_Res>::
1056 __basic_future(
const shared_future<_Res>& __sf) noexcept
1057 : _M_state(__sf._M_state)
1060 template<
typename _Res>
1061 inline __basic_future<_Res>::
1062 __basic_future(shared_future<_Res>&& __sf) noexcept
1066 template<
typename _Res>
1067 inline __basic_future<_Res>::
1068 __basic_future(future<_Res>&& __uf) noexcept
1074 template<
typename _Res>
1075 inline shared_future<_Res>
1076 future<_Res>::share() noexcept
1077 {
return shared_future<_Res>(
std::move(*
this)); }
1079 template<
typename _Res>
1080 inline shared_future<_Res&>
1081 future<_Res&>::share() noexcept
1082 {
return shared_future<_Res&>(
std::move(*
this)); }
1084 inline shared_future<void>
1085 future<void>::share() noexcept
1086 {
return shared_future<void>(
std::move(*
this)); }
1089 template<
typename _Res>
1094 static_assert(!
is_array<_Res>{},
"result type must not be an array");
1097 "result type must be destructible");
1099 typedef __future_base::_State_base _State;
1100 typedef __future_base::_Result<_Res> _Res_type;
1101 typedef __future_base::_Ptr<_Res_type> _Ptr_type;
1102 template<
typename,
typename>
friend struct _State::_Setter;
1106 _Ptr_type _M_storage;
1111 _M_storage(
new _Res_type())
1114 promise(promise&& __rhs) noexcept
1115 : _M_future(
std::move(__rhs._M_future)),
1119 template<
typename _Allocator>
1120 promise(allocator_arg_t,
const _Allocator& __a)
1122 _M_storage(__future_base::_S_allocate_result<_Res>(__a))
1125 template<
typename _Allocator>
1126 promise(allocator_arg_t,
const _Allocator&, promise&& __rhs)
1127 : _M_future(
std::move(__rhs._M_future)),
1131 promise(
const promise&) =
delete;
1135 if (
static_cast<bool>(_M_future) && !_M_future.unique())
1136 _M_future->_M_break_promise(
std::move(_M_storage));
1141 operator=(promise&& __rhs)
noexcept
1147 promise& operator=(
const promise&) =
delete;
1150 swap(promise& __rhs)
noexcept
1152 _M_future.swap(__rhs._M_future);
1153 _M_storage.swap(__rhs._M_storage);
1163 set_value(
const _Res& __r)
1164 { _M_state()._M_set_result(_State::__setter(
this, __r)); }
1167 set_value(_Res&& __r)
1168 { _M_state()._M_set_result(_State::__setter(
this,
std::move(__r))); }
1172 { _M_state()._M_set_result(_State::__setter(__p,
this)); }
1175 set_value_at_thread_exit(
const _Res& __r)
1177 _M_state()._M_set_delayed_result(_State::__setter(
this, __r),
1182 set_value_at_thread_exit(_Res&& __r)
1184 _M_state()._M_set_delayed_result(
1185 _State::__setter(
this,
std::move(__r)), _M_future);
1191 _M_state()._M_set_delayed_result(_State::__setter(__p,
this),
1199 __future_base::_State_base::_S_check(_M_future);
1204 template<
typename _Res>
1209 template<
typename _Res,
typename _Alloc>
1210 struct uses_allocator<promise<_Res>, _Alloc>
1211 :
public true_type { };
1215 template<
typename _Res>
1216 class promise<_Res&>
1218 typedef __future_base::_State_base _State;
1219 typedef __future_base::_Result<_Res&> _Res_type;
1220 typedef __future_base::_Ptr<_Res_type> _Ptr_type;
1221 template<
typename,
typename>
friend struct _State::_Setter;
1225 _Ptr_type _M_storage;
1230 _M_storage(
new _Res_type())
1233 promise(promise&& __rhs) noexcept
1234 : _M_future(
std::move(__rhs._M_future)),
1238 template<
typename _Allocator>
1239 promise(allocator_arg_t,
const _Allocator& __a)
1241 _M_storage(__future_base::_S_allocate_result<_Res&>(__a))
1244 template<
typename _Allocator>
1245 promise(allocator_arg_t,
const _Allocator&, promise&& __rhs)
1246 : _M_future(
std::move(__rhs._M_future)),
1250 promise(
const promise&) =
delete;
1254 if (
static_cast<bool>(_M_future) && !_M_future.unique())
1255 _M_future->_M_break_promise(
std::move(_M_storage));
1260 operator=(promise&& __rhs)
noexcept
1266 promise& operator=(
const promise&) =
delete;
1269 swap(promise& __rhs)
noexcept
1271 _M_future.swap(__rhs._M_future);
1272 _M_storage.swap(__rhs._M_storage);
1282 set_value(_Res& __r)
1283 { _M_state()._M_set_result(_State::__setter(
this, __r)); }
1287 { _M_state()._M_set_result(_State::__setter(__p,
this)); }
1290 set_value_at_thread_exit(_Res& __r)
1292 _M_state()._M_set_delayed_result(_State::__setter(
this, __r),
1299 _M_state()._M_set_delayed_result(_State::__setter(__p,
this),
1307 __future_base::_State_base::_S_check(_M_future);
1316 typedef __future_base::_State_base _State;
1317 typedef __future_base::_Result<void> _Res_type;
1318 typedef __future_base::_Ptr<_Res_type> _Ptr_type;
1319 template<
typename,
typename>
friend struct _State::_Setter;
1323 _Ptr_type _M_storage;
1328 _M_storage(
new _Res_type())
1331 promise(promise&& __rhs) noexcept
1332 : _M_future(
std::move(__rhs._M_future)),
1336 template<
typename _Allocator>
1337 promise(allocator_arg_t,
const _Allocator& __a)
1339 _M_storage(__future_base::_S_allocate_result<void>(__a))
1344 template<
typename _Allocator>
1345 promise(allocator_arg_t,
const _Allocator&, promise&& __rhs)
1346 : _M_future(
std::move(__rhs._M_future)),
1350 promise(
const promise&) =
delete;
1354 if (
static_cast<bool>(_M_future) && !_M_future.unique())
1355 _M_future->_M_break_promise(
std::move(_M_storage));
1360 operator=(promise&& __rhs)
noexcept
1366 promise& operator=(
const promise&) =
delete;
1369 swap(promise& __rhs)
noexcept
1371 _M_future.swap(__rhs._M_future);
1372 _M_storage.swap(__rhs._M_storage);
1383 { _M_state()._M_set_result(_State::__setter(
this)); }
1387 { _M_state()._M_set_result(_State::__setter(__p,
this)); }
1390 set_value_at_thread_exit()
1391 { _M_state()._M_set_delayed_result(_State::__setter(
this), _M_future); }
1396 _M_state()._M_set_delayed_result(_State::__setter(__p,
this),
1404 __future_base::_State_base::_S_check(_M_future);
1410 template<
typename _Ptr_type,
typename _Fn,
typename _Res>
1411 struct __future_base::_Task_setter
1414 _Ptr_type operator()()
const
1418 (*_M_result)->_M_set((*_M_fn)());
1422 __throw_exception_again;
1430 _Ptr_type* _M_result;
1434 template<
typename _Ptr_type,
typename _Fn>
1435 struct __future_base::_Task_setter<_Ptr_type, _Fn, void>
1437 _Ptr_type operator()()
const
1443 __catch(
const __cxxabiv1::__forced_unwind&)
1445 __throw_exception_again;
1453 _Ptr_type* _M_result;
1458 template<
typename _Res,
typename... _Args>
1459 struct __future_base::_Task_state_base<_Res(_Args...)>
1460 : __future_base::_State_base
1462 typedef _Res _Res_type;
1464 template<
typename _Alloc>
1465 _Task_state_base(
const _Alloc& __a)
1466 : _M_result(_S_allocate_result<_Res>(__a))
1471 _M_run(_Args&&... __args) = 0;
1475 _M_run_delayed(_Args&&... __args, weak_ptr<_State_base>) = 0;
1477 virtual shared_ptr<_Task_state_base>
1480 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1481 _Ptr_type _M_result;
1485 template<
typename _Fn,
typename _Alloc,
typename _Res,
typename... _Args>
1486 struct __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)> final
1487 : __future_base::_Task_state_base<_Res(_Args...)>
1489 template<
typename _Fn2>
1490 _Task_state(_Fn2&& __fn,
const _Alloc& __a)
1491 : _Task_state_base<_Res(_Args...)>(__a),
1492 _M_impl(std::
forward<_Fn2>(__fn), __a)
1497 _M_run(_Args&&... __args)
1499 auto __boundfn = [&] () -> _Res {
1500 return std::__invoke_r<_Res>(_M_impl._M_fn,
1503 this->_M_set_result(_S_task_setter(this->_M_result, __boundfn));
1507 _M_run_delayed(_Args&&... __args, weak_ptr<_State_base> __self)
1509 auto __boundfn = [&] () -> _Res {
1510 return std::__invoke_r<_Res>(_M_impl._M_fn,
1513 this->_M_set_delayed_result(_S_task_setter(this->_M_result, __boundfn),
1517 virtual shared_ptr<_Task_state_base<_Res(_Args...)>>
1520 struct _Impl : _Alloc
1522 template<
typename _Fn2>
1523 _Impl(_Fn2&& __fn,
const _Alloc& __a)
1524 : _Alloc(__a), _M_fn(std::
forward<_Fn2>(__fn)) { }
1529 template<
typename _Signature,
typename _Fn,
1530 typename _Alloc = std::allocator<int>>
1531 shared_ptr<__future_base::_Task_state_base<_Signature>>
1532 __create_task_state(_Fn&& __fn,
const _Alloc& __a = _Alloc())
1534 typedef typename decay<_Fn>::type _Fn2;
1535 typedef __future_base::_Task_state<_Fn2, _Alloc, _Signature> _State;
1539 template<
typename _Fn,
typename _Alloc,
typename _Res,
typename... _Args>
1540 shared_ptr<__future_base::_Task_state_base<_Res(_Args...)>>
1541 __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)>::_M_reset()
1543 return __create_task_state<_Res(_Args...)>(
std::move(_M_impl._M_fn),
1544 static_cast<_Alloc&
>(_M_impl));
1549 template<
typename _Res,
typename... _ArgTypes>
1550 class packaged_task<_Res(_ArgTypes...)>
1552 typedef __future_base::_Task_state_base<_Res(_ArgTypes...)> _State_type;
1557 template<
typename _Fn,
typename _Fn2 = __remove_cvref_t<_Fn>>
1563 packaged_task()
noexcept { }
1565 template<
typename _Fn,
typename = __not_same<_Fn>>
1567 packaged_task(_Fn&& __fn)
1571#ifdef __cpp_lib_is_invocable
1575 static_assert(is_invocable_r_v<_Res, decay_t<_Fn>&, _ArgTypes...>);
1579#if __cplusplus < 201703L
1584 template<
typename _Fn,
typename _Alloc,
typename = __not_same<_Fn>>
1585 packaged_task(allocator_arg_t,
const _Alloc& __a, _Fn&& __fn)
1586 : _M_state(__create_task_state<_Res(_ArgTypes...)>(
1592 template<
typename _Allocator>
1593 packaged_task(allocator_arg_t,
const _Allocator&)
noexcept
1596 template<
typename _Allocator>
1597 packaged_task(allocator_arg_t,
const _Allocator&,
1598 const packaged_task&) =
delete;
1600 template<
typename _Allocator>
1601 packaged_task(allocator_arg_t,
const _Allocator&,
1602 packaged_task&& __other)
noexcept
1603 { this->swap(__other); }
1608 if (
static_cast<bool>(_M_state) && !_M_state.unique())
1609 _M_state->_M_break_promise(
std::move(_M_state->_M_result));
1613 packaged_task(
const packaged_task&) =
delete;
1614 packaged_task& operator=(
const packaged_task&) =
delete;
1617 packaged_task(packaged_task&& __other)
noexcept
1618 { this->swap(__other); }
1620 packaged_task& operator=(packaged_task&& __other)
noexcept
1622 packaged_task(
std::move(__other)).swap(*
this);
1627 swap(packaged_task& __other)
noexcept
1628 { _M_state.swap(__other._M_state); }
1631 valid()
const noexcept
1632 {
return static_cast<bool>(_M_state); }
1641 operator()(_ArgTypes... __args)
1643 __future_base::_State_base::_S_check(_M_state);
1648 make_ready_at_thread_exit(_ArgTypes... __args)
1650 __future_base::_State_base::_S_check(_M_state);
1657 __future_base::_State_base::_S_check(_M_state);
1658 packaged_task __tmp;
1659 __tmp._M_state = _M_state;
1660 _M_state = _M_state->_M_reset();
1666#if __cpp_deduction_guides >= 201606
1667 template<
typename _Res,
typename... _ArgTypes>
1668 packaged_task(_Res(*)(_ArgTypes...)) -> packaged_task<_Res(_ArgTypes...)>;
1670 template<
typename _Fun,
typename _Signature
1671 = __function_guide_t<_Fun,
decltype(&_Fun::operator())>>
1672 packaged_task(_Fun) -> packaged_task<_Signature>;
1676 template<
typename _Res,
typename... _ArgTypes>
1678 swap(packaged_task<_Res(_ArgTypes...)>& __x,
1679 packaged_task<_Res(_ArgTypes...)>& __y)
noexcept
1682#if __cplusplus < 201703L
1685 template<
typename _Res,
typename _Alloc>
1686 struct uses_allocator<packaged_task<_Res>, _Alloc>
1687 :
public true_type { };
1694 template<
typename _BoundFn,
typename _Res>
1695 class __future_base::_Deferred_state final
1696 :
public __future_base::_State_base
1699 template<
typename... _Args>
1701 _Deferred_state(_Args&&... __args)
1702 : _M_result(new _Result<_Res>()),
1703 _M_fn(std::
forward<_Args>(__args)...)
1707 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1708 _Ptr_type _M_result;
1721 _M_set_result(_S_task_setter(_M_result, _M_fn),
true);
1726 virtual bool _M_is_deferred_future()
const {
return true; }
1730 class __future_base::_Async_state_commonV2
1731 :
public __future_base::_State_base
1734 ~_Async_state_commonV2() =
default;
1751 virtual void _M_complete_async() { _M_join(); }
1753 void _M_join() {
std::call_once(_M_once, &thread::join, &_M_thread); }
1761 template<
typename _BoundFn,
typename _Res>
1762 class __future_base::_Async_state_impl final
1763 :
public __future_base::_Async_state_commonV2
1766 template<
typename... _Args>
1768 _Async_state_impl(_Args&&... __args)
1769 : _M_result(new _Result<_Res>()),
1770 _M_fn(std::
forward<_Args>(__args)...)
1772 _M_thread = std::thread{&_Async_state_impl::_M_run,
this};
1778 ~_Async_state_impl()
1780 if (_M_thread.joinable())
1790 _M_set_result(_S_task_setter(_M_result, _M_fn));
1792 __catch (
const __cxxabiv1::__forced_unwind&)
1795 if (
static_cast<bool>(_M_result))
1796 this->_M_break_promise(
std::move(_M_result));
1797 __throw_exception_again;
1801 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1802 _Ptr_type _M_result;
1808 template<
typename _Fn,
typename... _Args>
1809 _GLIBCXX_NODISCARD future<__async_result_of<_Fn, _Args...>>
1812 using _Wr = std::thread::_Call_wrapper<_Fn, _Args...>;
1813 using _As = __future_base::_Async_state_impl<_Wr>;
1814 using _Ds = __future_base::_Deferred_state<_Wr>;
1817 if ((__policy & launch::async) == launch::async)
1827 if (__e.code() != errc::resource_unavailable_try_again
1828 || (__policy & launch::deferred) != launch::deferred)
1842 template<
typename _Fn,
typename... _Args>
1843 _GLIBCXX_NODISCARD
inline future<__async_result_of<_Fn, _Args...>>
1846 return std::async(launch::async|launch::deferred,
1855_GLIBCXX_END_NAMESPACE_VERSION
const error_category & future_category() noexcept
Points to a statically-allocated object derived from error_category.
error_condition make_error_condition(future_errc __errc) noexcept
Overload of make_error_condition for future_errc.
error_code make_error_code(future_errc __errc) noexcept
Overload of make_error_code for future_errc.
future_status
Status code for futures.
future_errc
Error code for futures.
launch
Launch code for futures.
future< __async_result_of< _Fn, _Args... > > async(launch __policy, _Fn &&__fn, _Args &&... __args)
async
shared_ptr< _NonArray< _Tp > > make_shared(_Args &&... __args)
Create an object that is owned by a shared_ptr.
shared_ptr< _NonArray< _Tp > > allocate_shared(const _Alloc &__a, _Args &&... __args)
Create an object that is owned by a shared_ptr.
void swap(shared_ptr< _Tp > &__a, shared_ptr< _Tp > &__b) noexcept
Swap overload for shared_ptr.
__bool_constant< true > true_type
The type used as a compile-time boolean with true value.
auto declval() noexcept -> decltype(__declval< _Tp >(0))
constexpr _Tp * addressof(_Tp &__r) noexcept
Returns the actual address of the object or function referenced by r, even in the presence of an over...
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
exception_ptr current_exception() noexcept
exception_ptr make_exception_ptr(_Ex) noexcept
Obtain an exception_ptr pointing to a copy of the supplied object.
void rethrow_exception(exception_ptr)
Throw the object pointed to by the exception_ptr.
void call_once(once_flag &__once, _Callable &&__f, _Args &&... __args)
Invoke a callable and synchronize with other calls using the same flag.
ISO C++ entities toplevel namespace is std.
constexpr bitset< _Nb > operator^(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
constexpr bitset< _Nb > operator|(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
constexpr bitset< _Nb > operator&(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Exception type thrown by futures.
virtual const char * what() const noexcept
Primary template for future.
future(future &&__uf) noexcept
Move constructor.
_Res get()
Retrieving the value.
Primary template for shared_future.
shared_future(shared_future &&__sf) noexcept
Construct from a shared_future rvalue.
shared_future(const shared_future &__sf) noexcept
Copy constructor.
shared_future(future< _Res > &&__uf) noexcept
Construct from a future rvalue.
const _Res & get() const
Retrieving the value.
Primary template for promise.
Common implementation for future and shared_future.
__result_type _M_get_result() const
Wait for the state to be ready and rethrow any stored exception.
future(future &&__uf) noexcept
Move constructor.
_Res & get()
Retrieving the value.
void get()
Retrieving the value.
future(future &&__uf) noexcept
Move constructor.
shared_future(future< _Res & > &&__uf) noexcept
Construct from a future rvalue.
_Res & get() const
Retrieving the value.
shared_future(const shared_future &__sf)
Copy constructor.
shared_future(shared_future &&__sf) noexcept
Construct from a shared_future rvalue.
shared_future(future< void > &&__uf) noexcept
Construct from a future rvalue.
shared_future(shared_future &&__sf) noexcept
Construct from a shared_future rvalue.
shared_future(const shared_future &__sf)
Copy constructor.
One of two subclasses of exception.
logic_error(const string &__arg)
An exception type that includes an error_code value.
Define a member typedef type only if a boolean constant is true.
chrono::duration represents a distance between two points in time
chrono::time_point represents a point in time as measured by a clock
Thrown as part of forced unwinding.
An opaque pointer to an arbitrary exception.
A smart pointer with reference-counted copy semantics.