29 #ifndef _GLIBCXX_FUTURE
30 #define _GLIBCXX_FUTURE 1
32 #pragma GCC system_header
34 #if __cplusplus < 201103L
47 #include <bits/shared_ptr.h>
49 #include <bits/uses_allocator.h>
53 namespace std _GLIBCXX_VISIBILITY(default)
55 _GLIBCXX_BEGIN_NAMESPACE_VERSION
68 future_already_retrieved = 1,
69 promise_already_satisfied,
88 inline error_condition
110 code() const noexcept {
return _M_code; }
115 :
logic_error(
"std::future_error: " + __ec.message()), _M_code(__ec)
118 friend void __throw_future_error(
int);
124 template<
typename _Res>
127 template<
typename _Res>
130 template<
typename _Signature>
133 template<
typename _Res>
145 return static_cast<launch>(
146 static_cast<int>(__x) &
static_cast<int>(__y));
151 return static_cast<launch>(
152 static_cast<int>(__x) |
static_cast<int>(__y));
157 return static_cast<launch>(
158 static_cast<int>(__x) ^
static_cast<int>(__y));
162 {
return static_cast<launch>(~static_cast<int>(__x)); }
165 {
return __x = __x & __y; }
168 {
return __x = __x | __y; }
171 {
return __x = __x ^ __y; }
183 template<
typename _Fn,
typename... _Args>
184 using __async_result_of =
typename __invoke_result<
185 typename decay<_Fn>::type,
typename decay<_Args>::type...>::type;
187 template<
typename _Fn,
typename... _Args>
188 future<__async_result_of<_Fn, _Args...>>
189 async(
launch __policy, _Fn&& __fn, _Args&&... __args);
191 template<
typename _Fn,
typename... _Args>
192 future<__async_result_of<_Fn, _Args...>>
193 async(_Fn&& __fn, _Args&&... __args);
195 #if defined(_GLIBCXX_HAS_GTHREADS)
209 virtual void _M_destroy() = 0;
213 void operator()(
_Result_base* __fr)
const { __fr->_M_destroy(); }
222 template<
typename _Res>
226 template<
typename _Res>
230 __gnu_cxx::__aligned_buffer<_Res> _M_storage;
234 typedef _Res result_type;
236 _Result() noexcept : _M_initialized() { }
246 _M_value() noexcept {
return *_M_storage._M_ptr(); }
249 _M_set(
const _Res& __res)
251 ::new (_M_storage._M_addr()) _Res(__res);
252 _M_initialized =
true;
258 ::new (_M_storage._M_addr()) _Res(
std::move(__res));
259 _M_initialized =
true;
263 void _M_destroy() {
delete this; }
267 template<
typename _Res,
typename _Alloc>
270 using __allocator_type = __alloc_rebind<_Alloc, _Result_alloc>;
279 __allocator_type __a(*
this);
286 template<
typename _Res,
typename _Allocator>
288 _S_allocate_result(
const _Allocator& __a)
291 typename __result_type::__allocator_type __a2(__a);
293 __result_type* __p = ::new((
void*)__guard.get()) __result_type{__a};
295 return _Ptr<__result_type>(__p);
299 template<
typename _Res,
typename _Tp>
300 static _Ptr<_Result<_Res>>
303 return _Ptr<_Result<_Res>>(
new _Result<_Res>);
311 typedef _Ptr<_Result_base> _Ptr_type;
313 enum _Status :
unsigned {
319 __atomic_futex_unsigned<> _M_status;
320 atomic_flag _M_retrieved = ATOMIC_FLAG_INIT;
324 _State_baseV2() noexcept : _M_result(), _M_status(_Status::__not_ready)
326 _State_baseV2(
const _State_baseV2&) =
delete;
327 _State_baseV2& operator=(
const _State_baseV2&) =
delete;
328 virtual ~_State_baseV2() =
default;
337 _M_status._M_load_when_equal(_Status::__ready, memory_order_acquire);
341 template<
typename _Rep,
typename _Period>
343 wait_for(
const chrono::duration<_Rep, _Period>& __rel)
347 if (_M_status._M_load(memory_order_acquire) == _Status::__ready)
348 return future_status::ready;
350 if (_M_is_deferred_future())
351 return future_status::deferred;
354 if (__rel > __rel.zero()
355 && _M_status._M_load_when_equal_for(_Status::__ready,
356 memory_order_acquire,
370 return future_status::ready;
372 return future_status::timeout;
375 template<
typename _Clock,
typename _Duration>
377 wait_until(
const chrono::time_point<_Clock, _Duration>& __abs)
379 #if __cplusplus > 201703L
380 static_assert(chrono::is_clock_v<_Clock>);
384 if (_M_status._M_load(memory_order_acquire) == _Status::__ready)
385 return future_status::ready;
387 if (_M_is_deferred_future())
388 return future_status::deferred;
390 if (_M_status._M_load_when_equal_until(_Status::__ready,
391 memory_order_acquire,
399 return future_status::ready;
401 return future_status::timeout;
407 _M_set_result(
function<_Ptr_type()> __res,
bool __ignore_failure =
false)
409 bool __did_set =
false;
412 call_once(_M_once, &_State_baseV2::_M_do_set,
this,
416 _M_status._M_store_notify_all(_Status::__ready,
417 memory_order_release);
418 else if (!__ignore_failure)
419 __throw_future_error(
int(future_errc::promise_already_satisfied));
426 _M_set_delayed_result(
function<_Ptr_type()> __res,
427 weak_ptr<_State_baseV2> __self)
429 bool __did_set =
false;
430 unique_ptr<_Make_ready> __mr{
new _Make_ready};
433 call_once(_M_once, &_State_baseV2::_M_do_set,
this,
436 __throw_future_error(
int(future_errc::promise_already_satisfied));
437 __mr->_M_shared_state =
std::move(__self);
444 _M_break_promise(_Ptr_type __res)
446 if (
static_cast<bool>(__res))
454 _M_result.swap(__res);
456 _M_status._M_store_notify_all(_Status::__ready,
457 memory_order_release);
463 _M_set_retrieved_flag()
465 if (_M_retrieved.test_and_set())
466 __throw_future_error(
int(future_errc::future_already_retrieved));
469 template<
typename _Res,
typename _Arg>
473 template<
typename _Res,
typename _Arg>
474 struct _Setter<_Res, _Arg&>
478 static_assert(is_same<_Res, _Arg&>::value
479 || is_same<const _Res, _Arg>::value,
480 "Invalid specialisation");
483 typename promise<_Res>::_Ptr_type operator()()
const
485 _M_promise->_M_storage->_M_set(*_M_arg);
486 return std::move(_M_promise->_M_storage);
488 promise<_Res>* _M_promise;
493 template<
typename _Res>
494 struct _Setter<_Res, _Res&&>
497 typename promise<_Res>::_Ptr_type operator()()
const
499 _M_promise->_M_storage->_M_set(
std::move(*_M_arg));
500 return std::move(_M_promise->_M_storage);
502 promise<_Res>* _M_promise;
507 template<
typename _Res>
508 struct _Setter<_Res, void>
510 static_assert(is_void<_Res>::value,
"Only used for promise<void>");
512 typename promise<_Res>::_Ptr_type operator()()
const
513 {
return std::move(_M_promise->_M_storage); }
515 promise<_Res>* _M_promise;
518 struct __exception_ptr_tag { };
521 template<
typename _Res>
522 struct _Setter<_Res, __exception_ptr_tag>
525 typename promise<_Res>::_Ptr_type operator()()
const
527 _M_promise->_M_storage->_M_error = *_M_ex;
528 return std::move(_M_promise->_M_storage);
531 promise<_Res>* _M_promise;
532 exception_ptr* _M_ex;
535 template<
typename _Res,
typename _Arg>
536 __attribute__((__always_inline__))
537 static _Setter<_Res, _Arg&&>
538 __setter(promise<_Res>* __prom, _Arg&& __arg) noexcept
543 template<
typename _Res>
544 __attribute__((__always_inline__))
545 static _Setter<_Res, __exception_ptr_tag>
546 __setter(exception_ptr& __ex, promise<_Res>* __prom) noexcept
548 return _Setter<_Res, __exception_ptr_tag>{ __prom, &__ex };
551 template<
typename _Res>
552 __attribute__((__always_inline__))
553 static _Setter<_Res, void>
554 __setter(promise<_Res>* __prom) noexcept
556 return _Setter<_Res, void>{ __prom };
559 template<
typename _Tp>
561 _S_check(
const shared_ptr<_Tp>& __p)
563 if (!
static_cast<bool>(__p))
564 __throw_future_error((
int)future_errc::no_state);
570 _M_do_set(
function<_Ptr_type()>* __f,
bool* __did_set)
572 _Ptr_type __res = (*__f)();
577 _M_result.swap(__res);
581 virtual void _M_complete_async() { }
584 virtual bool _M_is_deferred_future()
const {
return false; }
586 struct _Make_ready final : __at_thread_exit_elt
588 weak_ptr<_State_baseV2> _M_shared_state;
589 static void _S_run(
void*);
594 #ifdef _GLIBCXX_ASYNC_ABI_COMPAT
596 class _Async_state_common;
598 using _State_base = _State_baseV2;
599 class _Async_state_commonV2;
602 template<
typename _BoundFn,
603 typename _Res = decltype(std::declval<_BoundFn&>()())>
604 class _Deferred_state;
606 template<
typename _BoundFn,
607 typename _Res = decltype(std::declval<_BoundFn&>()())>
608 class _Async_state_impl;
610 template<
typename _Signature>
611 class _Task_state_base;
613 template<
typename _Fn,
typename _Alloc,
typename _Signature>
616 template<
typename _BoundFn>
618 _S_make_deferred_state(_BoundFn&& __fn);
620 template<
typename _BoundFn>
622 _S_make_async_state(_BoundFn&& __fn);
624 template<
typename _Res_ptr,
typename _Fn,
625 typename _Res =
typename _Res_ptr::element_type::result_type>
628 template<
typename _Res_ptr,
typename _BoundFn>
629 static _Task_setter<_Res_ptr, _BoundFn>
630 _S_task_setter(_Res_ptr& __ptr, _BoundFn& __call)
637 template<
typename _Res>
640 typedef _Res& result_type;
642 _Result() noexcept : _M_value_ptr() { }
645 _M_set(_Res& __res) noexcept
648 _Res& _M_get() noexcept {
return *_M_value_ptr; }
653 void _M_destroy() {
delete this; }
660 typedef void result_type;
663 void _M_destroy() {
delete this; }
666 #ifndef _GLIBCXX_ASYNC_ABI_COMPAT
669 template<
typename _Res,
typename _Arg>
675 template<
typename _Res_ptr,
typename _Fn,
typename _Res>
681 template<
typename _Res>
697 valid()
const noexcept {
return static_cast<bool>(_M_state); }
702 _State_base::_S_check(_M_state);
706 template<
typename _Rep,
typename _Period>
710 _State_base::_S_check(_M_state);
711 return _M_state->wait_for(__rel);
714 template<
typename _Clock,
typename _Duration>
718 _State_base::_S_check(_M_state);
719 return _M_state->wait_until(__abs);
727 _State_base::_S_check(_M_state);
729 if (!(__res._M_error == 0))
736 _M_state.
swap(__that._M_state);
741 __basic_future(
const __state_type& __state) : _M_state(__state)
743 _State_base::_S_check(_M_state);
744 _M_state->_M_set_retrieved_flag();
749 __basic_future(
const shared_future<_Res>&) noexcept;
753 __basic_future(shared_future<_Res>&&) noexcept;
757 __basic_future(future<_Res>&&) noexcept;
759 constexpr __basic_future() noexcept : _M_state() { }
763 explicit _Reset(__basic_future& __fut) noexcept : _M_fut(__fut) { }
764 ~_Reset() { _M_fut._M_state.reset(); }
765 __basic_future& _M_fut;
771 template<
typename _Res>
775 template<
typename>
friend class packaged_task;
776 template<
typename _Fn,
typename... _Args>
777 friend future<__async_result_of<_Fn, _Args...>>
806 typename _Base_type::_Reset __reset(*
this);
814 template<typename _Res>
818 template<
typename>
friend class packaged_task;
819 template<
typename _Fn,
typename... _Args>
820 friend future<__async_result_of<_Fn, _Args...>>
849 typename _Base_type::_Reset __reset(*
this);
861 template<
typename>
friend class packaged_task;
862 template<
typename _Fn,
typename... _Args>
863 friend future<__async_result_of<_Fn, _Args...>>
892 typename _Base_type::_Reset __reset(*
this);
901 template<typename _Res>
928 shared_future& operator=(shared_future&& __sf) noexcept
930 shared_future(
std::move(__sf))._M_swap(*
this);
940 template<
typename _Res>
967 shared_future& operator=(shared_future&& __sf) noexcept
969 shared_future(
std::move(__sf))._M_swap(*
this);
1006 shared_future& operator=(shared_future&& __sf) noexcept
1008 shared_future(
std::move(__sf))._M_swap(*
this);
1018 template<
typename _Res>
1019 inline __basic_future<_Res>::
1020 __basic_future(
const shared_future<_Res>& __sf) noexcept
1021 : _M_state(__sf._M_state)
1024 template<
typename _Res>
1025 inline __basic_future<_Res>::
1026 __basic_future(shared_future<_Res>&& __sf) noexcept
1030 template<
typename _Res>
1031 inline __basic_future<_Res>::
1032 __basic_future(future<_Res>&& __uf) noexcept
1038 template<
typename _Res>
1039 inline shared_future<_Res>
1040 future<_Res>::share() noexcept
1041 {
return shared_future<_Res>(
std::move(*
this)); }
1043 template<
typename _Res>
1044 inline shared_future<_Res&>
1045 future<_Res&>::share() noexcept
1046 {
return shared_future<_Res&>(
std::move(*
this)); }
1048 inline shared_future<void>
1049 future<void>::share() noexcept
1050 {
return shared_future<void>(
std::move(*
this)); }
1053 template<
typename _Res>
1056 typedef __future_base::_State_base _State;
1059 template<
typename,
typename>
friend class _State::_Setter;
1067 : _M_future(std::make_shared<_State>()),
1072 : _M_future(
std::move(__rhs._M_future)),
1076 template<
typename _Allocator>
1078 : _M_future(std::allocate_shared<_State>(__a)),
1079 _M_storage(__future_base::_S_allocate_result<_Res>(__a))
1082 template<
typename _Allocator>
1084 : _M_future(
std::move(__rhs._M_future)),
1092 if (
static_cast<bool>(_M_future) && !_M_future.unique())
1093 _M_future->_M_break_promise(
std::move(_M_storage));
1098 operator=(
promise&& __rhs) noexcept
1109 _M_future.
swap(__rhs._M_future);
1110 _M_storage.
swap(__rhs._M_storage);
1120 set_value(
const _Res& __r)
1121 { _M_state()._M_set_result(_State::__setter(
this, __r)); }
1124 set_value(_Res&& __r)
1125 { _M_state()._M_set_result(_State::__setter(
this,
std::move(__r))); }
1129 { _M_state()._M_set_result(_State::__setter(__p,
this)); }
1132 set_value_at_thread_exit(
const _Res& __r)
1134 _M_state()._M_set_delayed_result(_State::__setter(
this, __r),
1139 set_value_at_thread_exit(_Res&& __r)
1141 _M_state()._M_set_delayed_result(
1142 _State::__setter(
this,
std::move(__r)), _M_future);
1148 _M_state()._M_set_delayed_result(_State::__setter(__p,
this),
1156 __future_base::_State_base::_S_check(_M_future);
1161 template<
typename _Res>
1166 template<
typename _Res,
typename _Alloc>
1167 struct uses_allocator<promise<_Res>, _Alloc>
1172 template<
typename _Res>
1175 typedef __future_base::_State_base _State;
1178 template<
typename,
typename>
friend class _State::_Setter;
1186 : _M_future(std::make_shared<_State>()),
1191 : _M_future(
std::move(__rhs._M_future)),
1195 template<
typename _Allocator>
1197 : _M_future(std::allocate_shared<_State>(__a)),
1198 _M_storage(__future_base::_S_allocate_result<_Res&>(__a))
1201 template<
typename _Allocator>
1203 : _M_future(
std::move(__rhs._M_future)),
1211 if (
static_cast<bool>(_M_future) && !_M_future.unique())
1212 _M_future->_M_break_promise(
std::move(_M_storage));
1217 operator=(
promise&& __rhs) noexcept
1228 _M_future.
swap(__rhs._M_future);
1229 _M_storage.
swap(__rhs._M_storage);
1239 set_value(_Res& __r)
1240 { _M_state()._M_set_result(_State::__setter(
this, __r)); }
1244 { _M_state()._M_set_result(_State::__setter(__p,
this)); }
1247 set_value_at_thread_exit(_Res& __r)
1249 _M_state()._M_set_delayed_result(_State::__setter(
this, __r),
1256 _M_state()._M_set_delayed_result(_State::__setter(__p,
this),
1264 __future_base::_State_base::_S_check(_M_future);
1273 typedef __future_base::_State_base _State;
1276 template<
typename,
typename>
friend class _State::_Setter;
1284 : _M_future(std::make_shared<_State>()),
1289 : _M_future(
std::move(__rhs._M_future)),
1293 template<
typename _Allocator>
1295 : _M_future(std::allocate_shared<_State>(__a)),
1296 _M_storage(__future_base::_S_allocate_result<void>(__a))
1301 template<
typename _Allocator>
1303 : _M_future(
std::move(__rhs._M_future)),
1311 if (
static_cast<bool>(_M_future) && !_M_future.unique())
1312 _M_future->_M_break_promise(
std::move(_M_storage));
1317 operator=(
promise&& __rhs) noexcept
1328 _M_future.
swap(__rhs._M_future);
1329 _M_storage.
swap(__rhs._M_storage);
1340 { _M_state()._M_set_result(_State::__setter(
this)); }
1344 { _M_state()._M_set_result(_State::__setter(__p,
this)); }
1347 set_value_at_thread_exit()
1348 { _M_state()._M_set_delayed_result(_State::__setter(
this), _M_future); }
1353 _M_state()._M_set_delayed_result(_State::__setter(__p,
this),
1361 __future_base::_State_base::_S_check(_M_future);
1366 template<
typename _Ptr_type,
typename _Fn,
typename _Res>
1367 struct __future_base::_Task_setter
1370 _Ptr_type operator()()
const
1374 (*_M_result)->_M_set((*_M_fn)());
1378 __throw_exception_again;
1386 _Ptr_type* _M_result;
1390 template<
typename _Ptr_type,
typename _Fn>
1391 struct __future_base::_Task_setter<_Ptr_type, _Fn, void>
1393 _Ptr_type operator()()
const
1401 __throw_exception_again;
1409 _Ptr_type* _M_result;
1414 template<
typename _Res,
typename... _Args>
1415 struct __future_base::_Task_state_base<_Res(_Args...)>
1416 : __future_base::_State_base
1418 typedef _Res _Res_type;
1420 template<
typename _Alloc>
1421 _Task_state_base(
const _Alloc& __a)
1422 : _M_result(_S_allocate_result<_Res>(__a))
1427 _M_run(_Args&&... __args) = 0;
1431 _M_run_delayed(_Args&&... __args, weak_ptr<_State_base>) = 0;
1433 virtual shared_ptr<_Task_state_base>
1436 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1437 _Ptr_type _M_result;
1441 template<
typename _Fn,
typename _Alloc,
typename _Res,
typename... _Args>
1442 struct __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)> final
1443 : __future_base::_Task_state_base<_Res(_Args...)>
1445 template<
typename _Fn2>
1446 _Task_state(_Fn2&& __fn,
const _Alloc& __a)
1447 : _Task_state_base<_Res(_Args...)>(__a),
1453 _M_run(_Args&&... __args)
1455 auto __boundfn = [&] () -> _Res {
1456 return std::__invoke_r<_Res>(_M_impl._M_fn,
1457 std::forward<_Args>(__args)...);
1459 this->_M_set_result(_S_task_setter(this->_M_result, __boundfn));
1463 _M_run_delayed(_Args&&... __args, weak_ptr<_State_base> __self)
1465 auto __boundfn = [&] () -> _Res {
1466 return std::__invoke_r<_Res>(_M_impl._M_fn,
1467 std::forward<_Args>(__args)...);
1469 this->_M_set_delayed_result(_S_task_setter(this->_M_result, __boundfn),
1473 virtual shared_ptr<_Task_state_base<_Res(_Args...)>>
1476 struct _Impl : _Alloc
1478 template<
typename _Fn2>
1479 _Impl(_Fn2&& __fn,
const _Alloc& __a)
1480 : _Alloc(__a), _M_fn(
std::
forward<_Fn2>(__fn)) { }
1485 template<
typename _Signature,
typename _Fn,
1487 static shared_ptr<__future_base::_Task_state_base<_Signature>>
1488 __create_task_state(_Fn&& __fn,
const _Alloc& __a = _Alloc())
1490 typedef typename decay<_Fn>::type _Fn2;
1491 typedef __future_base::_Task_state<_Fn2, _Alloc, _Signature> _State;
1492 return std::allocate_shared<_State>(__a, std::forward<_Fn>(__fn), __a);
1495 template<
typename _Fn,
typename _Alloc,
typename _Res,
typename... _Args>
1496 shared_ptr<__future_base::_Task_state_base<_Res(_Args...)>>
1497 __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)>::_M_reset()
1499 return __create_task_state<_Res(_Args...)>(
std::move(_M_impl._M_fn),
1500 static_cast<_Alloc&
>(_M_impl));
1504 template<
typename _Res,
typename... _ArgTypes>
1505 class packaged_task<_Res(_ArgTypes...)>
1507 typedef __future_base::_Task_state_base<_Res(_ArgTypes...)> _State_type;
1512 template<
typename _Fn,
typename _Fn2 = __remove_cvref_t<_Fn>>
1518 packaged_task() noexcept { }
1520 template<
typename _Fn,
typename = __not_same<_Fn>>
1522 packaged_task(_Fn&& __fn)
1524 __create_task_state<_Res(_ArgTypes...)>(std::forward<_Fn>(__fn)))
1527 #if __cplusplus < 201703L
1532 template<
typename _Fn,
typename _Alloc,
typename = __not_same<_Fn>>
1534 : _M_state(__create_task_state<_Res(_ArgTypes...)>(
1535 std::forward<_Fn>(__fn), __a))
1540 template<
typename _Allocator>
1544 template<
typename _Allocator>
1546 const packaged_task&) =
delete;
1548 template<
typename _Allocator>
1550 packaged_task&& __other) noexcept
1551 { this->swap(__other); }
1556 if (
static_cast<bool>(_M_state) && !_M_state.unique())
1557 _M_state->_M_break_promise(
std::move(_M_state->_M_result));
1561 packaged_task(
const packaged_task&) =
delete;
1562 packaged_task& operator=(
const packaged_task&) =
delete;
1565 packaged_task(packaged_task&& __other) noexcept
1566 { this->swap(__other); }
1568 packaged_task& operator=(packaged_task&& __other) noexcept
1570 packaged_task(
std::move(__other)).swap(*
this);
1575 swap(packaged_task& __other) noexcept
1576 { _M_state.
swap(__other._M_state); }
1579 valid()
const noexcept
1580 {
return static_cast<bool>(_M_state); }
1589 operator()(_ArgTypes... __args)
1591 __future_base::_State_base::_S_check(_M_state);
1592 _M_state->_M_run(std::forward<_ArgTypes>(__args)...);
1596 make_ready_at_thread_exit(_ArgTypes... __args)
1598 __future_base::_State_base::_S_check(_M_state);
1599 _M_state->_M_run_delayed(std::forward<_ArgTypes>(__args)..., _M_state);
1605 __future_base::_State_base::_S_check(_M_state);
1606 packaged_task __tmp;
1607 __tmp._M_state = _M_state;
1608 _M_state = _M_state->_M_reset();
1613 template<
typename _Res,
typename... _ArgTypes>
1615 swap(packaged_task<_Res(_ArgTypes...)>& __x,
1616 packaged_task<_Res(_ArgTypes...)>& __y) noexcept
1619 #if __cplusplus < 201703L
1622 template<
typename _Res,
typename _Alloc>
1623 struct uses_allocator<packaged_task<_Res>, _Alloc>
1629 template<
typename _BoundFn,
typename _Res>
1630 class __future_base::_Deferred_state final
1631 :
public __future_base::_State_base
1635 _Deferred_state(_BoundFn&& __fn)
1636 : _M_result(new _Result<_Res>()), _M_fn(
std::
move(__fn))
1640 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1641 _Ptr_type _M_result;
1654 _M_set_result(_S_task_setter(_M_result, _M_fn),
true);
1659 virtual bool _M_is_deferred_future()
const {
return true; }
1663 class __future_base::_Async_state_commonV2
1664 :
public __future_base::_State_base
1667 ~_Async_state_commonV2() =
default;
1684 virtual void _M_complete_async() { _M_join(); }
1686 void _M_join() {
std::call_once(_M_once, &thread::join, &_M_thread); }
1694 template<
typename _BoundFn,
typename _Res>
1695 class __future_base::_Async_state_impl final
1696 :
public __future_base::_Async_state_commonV2
1700 _Async_state_impl(_BoundFn&& __fn)
1701 : _M_result(new _Result<_Res>()), _M_fn(
std::
move(__fn))
1706 _M_set_result(_S_task_setter(_M_result, _M_fn));
1711 if (
static_cast<bool>(_M_result))
1712 this->_M_break_promise(
std::move(_M_result));
1713 __throw_exception_again;
1721 ~_Async_state_impl() {
if (_M_thread.joinable()) _M_thread.join(); }
1724 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1725 _Ptr_type _M_result;
1729 template<
typename _BoundFn>
1731 __future_base::_S_make_deferred_state(_BoundFn&& __fn)
1733 typedef typename remove_reference<_BoundFn>::type __fn_type;
1734 typedef _Deferred_state<__fn_type> __state_type;
1735 return std::make_shared<__state_type>(
std::move(__fn));
1738 template<
typename _BoundFn>
1740 __future_base::_S_make_async_state(_BoundFn&& __fn)
1742 typedef typename remove_reference<_BoundFn>::type __fn_type;
1743 typedef _Async_state_impl<__fn_type> __state_type;
1744 return std::make_shared<__state_type>(
std::move(__fn));
1749 template<
typename _Fn,
typename... _Args>
1750 _GLIBCXX_NODISCARD future<__async_result_of<_Fn, _Args...>>
1751 async(
launch __policy, _Fn&& __fn, _Args&&... __args)
1754 if ((__policy & launch::async) == launch::async)
1758 __state = __future_base::_S_make_async_state(
1759 std::thread::__make_invoker(std::forward<_Fn>(__fn),
1760 std::forward<_Args>(__args)...)
1763 #if __cpp_exceptions
1766 if (__e.code() != errc::resource_unavailable_try_again
1767 || (__policy & launch::deferred) != launch::deferred)
1774 __state = __future_base::_S_make_deferred_state(
1775 std::thread::__make_invoker(std::forward<_Fn>(__fn),
1776 std::forward<_Args>(__args)...));
1778 return future<__async_result_of<_Fn, _Args...>>(__state);
1782 template<
typename _Fn,
typename... _Args>
1783 _GLIBCXX_NODISCARD
inline future<__async_result_of<_Fn, _Args...>>
1784 async(_Fn&& __fn, _Args&&... __args)
1786 return std::async(launch::async|launch::deferred,
1787 std::forward<_Fn>(__fn),
1788 std::forward<_Args>(__args)...);
1795 _GLIBCXX_END_NAMESPACE_VERSION
void swap(packaged_task< _Res(_ArgTypes...)> &__x, packaged_task< _Res(_ArgTypes...)> &__y) noexcept
swap
error_condition make_error_condition(future_errc __errc) noexcept
Overload for make_error_condition.
future_status
Status code for futures.
const error_category & future_category() noexcept
Points to a statically-allocated object derived from error_category.
future_errc
Error code for futures.
launch
Launch code for futures.
future< __async_result_of< _Fn, _Args... > > async(_Fn &&__fn, _Args &&... __args)
async, potential overload
future< __async_result_of< _Fn, _Args... > > async(launch __policy, _Fn &&__fn, _Args &&... __args)
async
void swap(shared_ptr< _Tp > &__a, shared_ptr< _Tp > &__b) noexcept
Swap overload for shared_ptr.
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
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...
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.
bitset< _Nb > operator^(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
__allocated_ptr< _Alloc > __allocate_guarded(_Alloc &__a)
Allocate space for a single object using __a.
bitset< _Nb > operator|(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
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.
const _Res & get() const
Retrieving the value.
shared_future(const shared_future &__sf) noexcept
Copy constructor.
shared_future(future< _Res > &&__uf) noexcept
Construct from a future rvalue.
Primary template for promise.
Base class and enclosing scope.
A result object that has storage for an object of type _Res.
A result object that uses an allocator.
Partial specialization for reference types.
Explicit specialization for void.
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.
Partial specialization for future<R&>
_Res & get()
Retrieving the value.
future(future &&__uf) noexcept
Move constructor.
Explicit specialization for future<void>
void get()
Retrieving the value.
future(future &&__uf) noexcept
Move constructor.
Partial specialization for shared_future<R&>
_Res & get() const
Retrieving the value.
shared_future(future< _Res & > &&__uf) noexcept
Construct from a future rvalue.
shared_future(const shared_future &__sf)
Copy constructor.
shared_future(shared_future &&__sf) noexcept
Construct from a shared_future rvalue.
Explicit specialization for shared_future<void>
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.
An exception type that includes an error_code value.
Define a member typedef type only if a boolean constant is true.
Non-standard RAII type for managing pointers obtained from allocators.
The standard allocator, as per C++03 [20.4.1].
Thrown as part of forced unwinding.
An opaque pointer to an arbitrary exception.
20.7.1.2 unique_ptr for single objects.
void swap(unique_ptr &__u) noexcept
Exchange the pointer and deleter with another object.