29 #ifndef _GLIBCXX_FUTURE
30 #define _GLIBCXX_FUTURE 1
32 #pragma GCC system_header
34 #if __cplusplus < 201103L
47 #include <bits/uses_allocator.h>
50 namespace std _GLIBCXX_VISIBILITY(default)
52 _GLIBCXX_BEGIN_NAMESPACE_VERSION
65 future_already_retrieved = 1,
66 promise_already_satisfied,
85 inline error_condition
105 what()
const noexcept;
108 code()
const noexcept {
return _M_code; }
112 template<
typename _Res>
115 template<
typename _Res>
118 template<
typename _Signature>
121 template<
typename _Res>
133 return static_cast<launch>(
134 static_cast<int>(__x) & static_cast<int>(__y));
139 return static_cast<launch>(
140 static_cast<int>(__x) | static_cast<int>(__y));
145 return static_cast<launch>(
146 static_cast<int>(__x) ^ static_cast<int>(__y));
150 {
return static_cast<launch>(~static_cast<
int>(__x)); }
153 {
return __x = __x & __y; }
156 {
return __x = __x | __y; }
159 {
return __x = __x ^ __y; }
169 template<
typename _Fn,
typename... _Args>
170 future<
typename result_of<_Fn(_Args...)>::type>
171 async(
launch __policy, _Fn&& __fn, _Args&&... __args);
173 template<
typename _Fn,
typename... _Args>
174 future<
typename result_of<_Fn(_Args...)>::type>
175 async(_Fn&& __fn, _Args&&... __args);
177 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
178 && (ATOMIC_INT_LOCK_FREE > 1)
186 exception_ptr _M_error;
188 _Result_base(
const _Result_base&) =
delete;
189 _Result_base& operator=(
const _Result_base&) =
delete;
192 virtual void _M_destroy() = 0;
196 void operator()(_Result_base* __fr)
const { __fr->_M_destroy(); }
201 virtual ~_Result_base();
205 template<
typename _Res>
206 struct _Result : _Result_base
209 typedef alignment_of<_Res> __a_of;
210 typedef aligned_storage<sizeof(_Res), __a_of::value> __align_storage;
211 typedef typename __align_storage::type __align_type;
213 __align_type _M_storage;
217 typedef _Res result_type;
219 _Result() noexcept : _M_initialized() { }
229 _M_value() noexcept {
return *
static_cast<_Res*
>(_M_addr()); }
232 _M_set(
const _Res& __res)
234 ::new (_M_addr()) _Res(__res);
235 _M_initialized = true;
241 ::new (_M_addr()) _Res(std::move(__res));
242 _M_initialized = true;
246 void _M_destroy() {
delete this; }
248 void* _M_addr() noexcept {
return static_cast<void*
>(&_M_storage); }
252 template<
typename _Res>
253 using _Ptr = unique_ptr<_Res, _Result_base::_Deleter>;
256 template<
typename _Res,
typename _Alloc>
257 struct _Result_alloc final : _Result<_Res>, _Alloc
259 typedef typename allocator_traits<_Alloc>::template
260 rebind_alloc<_Result_alloc> __allocator_type;
263 _Result_alloc(
const _Alloc& __a) : _Result<_Res>(), _Alloc(__a)
269 typedef allocator_traits<__allocator_type> __traits;
270 __allocator_type __a(*
this);
271 __traits::destroy(__a,
this);
272 __traits::deallocate(__a,
this, 1);
276 template<
typename _Res,
typename _Allocator>
277 static _Ptr<_Result_alloc<_Res, _Allocator>>
278 _S_allocate_result(
const _Allocator& __a)
280 typedef _Result_alloc<_Res, _Allocator> __result_type;
281 typedef allocator_traits<typename __result_type::__allocator_type>
283 typename __traits::allocator_type __a2(__a);
284 __result_type* __p = __traits::allocate(__a2, 1);
287 __traits::construct(__a2, __p, __a);
291 __traits::deallocate(__a2, __p, 1);
292 __throw_exception_again;
294 return _Ptr<__result_type>(__p);
297 template<
typename _Res,
typename _Tp>
298 static _Ptr<_Result<_Res>>
301 return _Ptr<_Result<_Res>>(
new _Result<_Res>);
308 typedef _Ptr<_Result_base> _Ptr_type;
312 condition_variable _M_cond;
313 atomic_flag _M_retrieved;
317 _State_base() noexcept : _M_result(), _M_retrieved(ATOMIC_FLAG_INIT) { }
318 _State_base(
const _State_base&) =
delete;
319 _State_base& operator=(
const _State_base&) =
delete;
320 virtual ~_State_base();
326 unique_lock<mutex> __lock(_M_mutex);
327 _M_cond.wait(__lock, [&] {
return _M_ready(); });
331 template<
typename _Rep,
typename _Period>
333 wait_for(
const chrono::duration<_Rep, _Period>& __rel)
335 unique_lock<mutex> __lock(_M_mutex);
336 if (_M_cond.wait_for(__lock, __rel, [&] {
return _M_ready(); }))
337 return future_status::ready;
338 return future_status::timeout;
341 template<
typename _Clock,
typename _Duration>
343 wait_until(
const chrono::time_point<_Clock, _Duration>& __abs)
345 unique_lock<mutex> __lock(_M_mutex);
346 if (_M_cond.wait_until(__lock, __abs, [&] {
return _M_ready(); }))
347 return future_status::ready;
348 return future_status::timeout;
352 _M_set_result(
function<_Ptr_type()> __res,
bool __ignore_failure =
false)
354 bool __set = __ignore_failure;
357 call_once(_M_once, &_State_base::_M_do_set,
this,
ref(__res),
360 __throw_future_error(
int(future_errc::promise_already_satisfied));
364 _M_break_promise(_Ptr_type __res)
366 if (static_cast<bool>(__res))
368 error_code __ec(make_error_code(future_errc::broken_promise));
371 lock_guard<mutex> __lock(_M_mutex);
372 _M_result.swap(__res);
374 _M_cond.notify_all();
380 _M_set_retrieved_flag()
382 if (_M_retrieved.test_and_set())
383 __throw_future_error(
int(future_errc::future_already_retrieved));
386 template<
typename _Res,
typename _Arg>
390 template<
typename _Res,
typename _Arg>
391 struct _Setter<_Res, _Arg&>
395 static_assert(is_same<_Res, _Arg&>::value
396 || is_same<const _Res, _Arg>::value,
397 "Invalid specialisation");
399 typename promise<_Res>::_Ptr_type operator()()
401 _State_base::_S_check(_M_promise->_M_future);
402 _M_promise->_M_storage->_M_set(_M_arg);
403 return std::move(_M_promise->_M_storage);
405 promise<_Res>* _M_promise;
410 template<
typename _Res>
411 struct _Setter<_Res, _Res&&>
413 typename promise<_Res>::_Ptr_type operator()()
415 _State_base::_S_check(_M_promise->_M_future);
416 _M_promise->_M_storage->_M_set(std::move(_M_arg));
417 return std::move(_M_promise->_M_storage);
419 promise<_Res>* _M_promise;
423 struct __exception_ptr_tag { };
426 template<
typename _Res>
427 struct _Setter<_Res, __exception_ptr_tag>
429 typename promise<_Res>::_Ptr_type operator()()
431 _State_base::_S_check(_M_promise->_M_future);
432 _M_promise->_M_storage->_M_error = _M_ex;
433 return std::move(_M_promise->_M_storage);
436 promise<_Res>* _M_promise;
437 exception_ptr& _M_ex;
440 template<
typename _Res,
typename _Arg>
441 static _Setter<_Res, _Arg&&>
442 __setter(promise<_Res>* __prom, _Arg&& __arg)
444 return _Setter<_Res, _Arg&&>{ __prom, __arg };
447 template<
typename _Res>
448 static _Setter<_Res, __exception_ptr_tag>
449 __setter(exception_ptr& __ex, promise<_Res>* __prom)
451 return _Setter<_Res, __exception_ptr_tag>{ __prom, __ex };
454 static _Setter<void, void>
455 __setter(promise<void>* __prom);
457 template<
typename _Tp>
459 _S_check(
const shared_ptr<_Tp>& __p)
461 if (!static_cast<bool>(__p))
462 __throw_future_error((
int)future_errc::no_state);
467 _M_do_set(
function<_Ptr_type()>& __f,
bool& __set)
469 _Ptr_type __res = __f();
471 lock_guard<mutex> __lock(_M_mutex);
472 _M_result.swap(__res);
474 _M_cond.notify_all();
478 bool _M_ready() const noexcept {
return static_cast<bool>(_M_result); }
481 virtual void _M_run_deferred() { }
484 template<
typename _BoundFn,
typename =
typename _BoundFn::result_type>
485 class _Deferred_state;
487 class _Async_state_common;
489 template<
typename _BoundFn,
typename =
typename _BoundFn::result_type>
490 class _Async_state_impl;
492 template<
typename _Signature>
493 class _Task_state_base;
495 template<
typename _Fn,
typename _Alloc,
typename _Signature>
498 template<
typename _BoundFn>
500 _S_make_deferred_state(_BoundFn&& __fn);
502 template<
typename _BoundFn>
504 _S_make_async_state(_BoundFn&& __fn);
506 template<
typename _Res_ptr,
507 typename _Res =
typename _Res_ptr::element_type::result_type>
510 template<
typename _Res_ptr,
typename _BoundFn>
511 static _Task_setter<_Res_ptr>
512 _S_task_setter(_Res_ptr& __ptr, _BoundFn&& __call)
514 return _Task_setter<_Res_ptr>{ __ptr,
std::ref(__call) };
519 template<
typename _Res>
520 struct __future_base::_Result<_Res&> : __future_base::_Result_base
522 typedef _Res& result_type;
524 _Result() noexcept : _M_value_ptr() { }
526 void _M_set(_Res& __res) noexcept { _M_value_ptr = &__res; }
528 _Res& _M_get() noexcept {
return *_M_value_ptr; }
533 void _M_destroy() {
delete this; }
538 struct __future_base::_Result<void> : __future_base::_Result_base
540 typedef void result_type;
543 void _M_destroy() {
delete this; }
548 template<
typename _Res>
549 class __basic_future :
public __future_base
552 typedef shared_ptr<_State_base> __state_type;
553 typedef __future_base::_Result<_Res>& __result_type;
556 __state_type _M_state;
560 __basic_future(
const __basic_future&) =
delete;
561 __basic_future& operator=(
const __basic_future&) =
delete;
564 valid() const noexcept {
return static_cast<bool>(_M_state); }
569 _State_base::_S_check(_M_state);
573 template<
typename _Rep,
typename _Period>
575 wait_for(
const chrono::duration<_Rep, _Period>& __rel)
const
577 _State_base::_S_check(_M_state);
578 return _M_state->wait_for(__rel);
581 template<
typename _Clock,
typename _Duration>
583 wait_until(
const chrono::time_point<_Clock, _Duration>& __abs)
const
585 _State_base::_S_check(_M_state);
586 return _M_state->wait_until(__abs);
592 _M_get_result()
const
594 _State_base::_S_check(_M_state);
595 _Result_base& __res = _M_state->wait();
596 if (!(__res._M_error == 0))
598 return static_cast<__result_type
>(__res);
601 void _M_swap(__basic_future& __that) noexcept
603 _M_state.swap(__that._M_state);
608 __basic_future(
const __state_type& __state) : _M_state(__state)
610 _State_base::_S_check(_M_state);
611 _M_state->_M_set_retrieved_flag();
616 __basic_future(
const shared_future<_Res>&) noexcept;
620 __basic_future(shared_future<_Res>&&) noexcept;
624 __basic_future(future<_Res>&&) noexcept;
626 constexpr __basic_future() noexcept : _M_state() { }
630 explicit _Reset(__basic_future& __fut) noexcept : _M_fut(__fut) { }
631 ~_Reset() { _M_fut._M_state.reset(); }
632 __basic_future& _M_fut;
638 template<
typename _Res>
639 class future :
public __basic_future<_Res>
641 friend class promise<_Res>;
642 template<
typename>
friend class packaged_task;
643 template<
typename _Fn,
typename... _Args>
644 friend future<
typename result_of<_Fn(_Args...)>::type>
645 async(
launch, _Fn&&, _Args&&...);
647 typedef __basic_future<_Res> _Base_type;
648 typedef typename _Base_type::__state_type __state_type;
651 future(
const __state_type& __state) : _Base_type(__state) { }
654 constexpr future() noexcept : _Base_type() { }
657 future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { }
660 future(
const future&) =
delete;
661 future& operator=(
const future&) =
delete;
663 future& operator=(future&& __fut) noexcept
665 future(std::move(__fut))._M_swap(*
this);
673 typename _Base_type::_Reset __reset(*
this);
674 return std::move(this->_M_get_result()._M_value());
677 shared_future<_Res> share();
681 template<
typename _Res>
682 class future<_Res&> :
public __basic_future<_Res&>
684 friend class promise<_Res&>;
685 template<
typename>
friend class packaged_task;
686 template<
typename _Fn,
typename... _Args>
687 friend future<
typename result_of<_Fn(_Args...)>::type>
688 async(
launch, _Fn&&, _Args&&...);
690 typedef __basic_future<_Res&> _Base_type;
691 typedef typename _Base_type::__state_type __state_type;
694 future(
const __state_type& __state) : _Base_type(__state) { }
697 constexpr future() noexcept : _Base_type() { }
700 future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { }
703 future(
const future&) =
delete;
704 future& operator=(
const future&) =
delete;
706 future& operator=(future&& __fut) noexcept
708 future(std::move(__fut))._M_swap(*
this);
716 typename _Base_type::_Reset __reset(*
this);
717 return this->_M_get_result()._M_get();
720 shared_future<_Res&> share();
725 class future<void> :
public __basic_future<void>
727 friend class promise<void>;
728 template<
typename>
friend class packaged_task;
729 template<
typename _Fn,
typename... _Args>
730 friend future<
typename result_of<_Fn(_Args...)>::type>
731 async(
launch, _Fn&&, _Args&&...);
733 typedef __basic_future<void> _Base_type;
734 typedef typename _Base_type::__state_type __state_type;
737 future(
const __state_type& __state) : _Base_type(__state) { }
740 constexpr future() noexcept : _Base_type() { }
743 future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { }
746 future(
const future&) =
delete;
747 future& operator=(
const future&) =
delete;
749 future& operator=(future&& __fut) noexcept
751 future(std::move(__fut))._M_swap(*
this);
759 typename _Base_type::_Reset __reset(*
this);
760 this->_M_get_result();
763 shared_future<void> share();
768 template<
typename _Res>
769 class shared_future :
public __basic_future<_Res>
771 typedef __basic_future<_Res> _Base_type;
774 constexpr shared_future() noexcept : _Base_type() { }
777 shared_future(
const shared_future& __sf) : _Base_type(__sf) { }
780 shared_future(future<_Res>&& __uf) noexcept
781 : _Base_type(std::move(__uf))
785 shared_future(shared_future&& __sf) noexcept
786 : _Base_type(std::move(__sf))
789 shared_future& operator=(
const shared_future& __sf)
791 shared_future(__sf)._M_swap(*
this);
795 shared_future& operator=(shared_future&& __sf) noexcept
797 shared_future(std::move(__sf))._M_swap(*
this);
803 get()
const {
return this->_M_get_result()._M_value(); }
807 template<
typename _Res>
808 class shared_future<_Res&> :
public __basic_future<_Res&>
810 typedef __basic_future<_Res&> _Base_type;
813 constexpr shared_future() noexcept : _Base_type() { }
816 shared_future(
const shared_future& __sf) : _Base_type(__sf) { }
819 shared_future(future<_Res&>&& __uf) noexcept
820 : _Base_type(std::move(__uf))
824 shared_future(shared_future&& __sf) noexcept
825 : _Base_type(std::move(__sf))
828 shared_future& operator=(
const shared_future& __sf)
830 shared_future(__sf)._M_swap(*
this);
834 shared_future& operator=(shared_future&& __sf) noexcept
836 shared_future(std::move(__sf))._M_swap(*
this);
842 get()
const {
return this->_M_get_result()._M_get(); }
847 class shared_future<void> :
public __basic_future<void>
849 typedef __basic_future<void> _Base_type;
852 constexpr shared_future() noexcept : _Base_type() { }
855 shared_future(
const shared_future& __sf) : _Base_type(__sf) { }
858 shared_future(future<void>&& __uf) noexcept
859 : _Base_type(std::move(__uf))
863 shared_future(shared_future&& __sf) noexcept
864 : _Base_type(std::move(__sf))
867 shared_future& operator=(
const shared_future& __sf)
869 shared_future(__sf)._M_swap(*
this);
873 shared_future& operator=(shared_future&& __sf) noexcept
875 shared_future(std::move(__sf))._M_swap(*
this);
881 get()
const { this->_M_get_result(); }
885 template<
typename _Res>
886 inline __basic_future<_Res>::
887 __basic_future(
const shared_future<_Res>& __sf) noexcept
888 : _M_state(__sf._M_state)
891 template<
typename _Res>
892 inline __basic_future<_Res>::
893 __basic_future(shared_future<_Res>&& __sf) noexcept
894 : _M_state(std::move(__sf._M_state))
897 template<
typename _Res>
898 inline __basic_future<_Res>::
899 __basic_future(future<_Res>&& __uf) noexcept
900 : _M_state(std::move(__uf._M_state))
903 template<
typename _Res>
904 inline shared_future<_Res>
905 future<_Res>::share()
906 {
return shared_future<_Res>(std::move(*
this)); }
908 template<
typename _Res>
909 inline shared_future<_Res&>
910 future<_Res&>::share()
911 {
return shared_future<_Res&>(std::move(*
this)); }
913 inline shared_future<void>
914 future<void>::share()
915 {
return shared_future<void>(std::move(*
this)); }
918 template<
typename _Res>
921 typedef __future_base::_State_base _State;
922 typedef __future_base::_Result<_Res> _Res_type;
923 typedef __future_base::_Ptr<_Res_type> _Ptr_type;
924 template<
typename,
typename>
friend class _State::_Setter;
926 shared_ptr<_State> _M_future;
927 _Ptr_type _M_storage;
932 _M_storage(new _Res_type())
935 promise(promise&& __rhs) noexcept
936 : _M_future(std::move(__rhs._M_future)),
937 _M_storage(std::move(__rhs._M_storage))
940 template<
typename _Allocator>
941 promise(allocator_arg_t,
const _Allocator& __a)
943 _M_storage(__future_base::_S_allocate_result<_Res>(__a))
946 template<
typename _Allocator>
947 promise(allocator_arg_t,
const _Allocator&, promise&& __rhs)
948 : _M_future(std::move(__rhs._M_future)),
949 _M_storage(std::move(__rhs._M_storage))
952 promise(
const promise&) =
delete;
956 if (static_cast<bool>(_M_future) && !_M_future.unique())
957 _M_future->_M_break_promise(std::move(_M_storage));
962 operator=(promise&& __rhs) noexcept
964 promise(std::move(__rhs)).swap(*
this);
968 promise& operator=(
const promise&) =
delete;
971 swap(promise& __rhs) noexcept
973 _M_future.swap(__rhs._M_future);
974 _M_storage.swap(__rhs._M_storage);
980 {
return future<_Res>(_M_future); }
984 set_value(
const _Res& __r)
986 auto __setter = _State::__setter(
this, __r);
987 _M_future->_M_set_result(std::move(__setter));
991 set_value(_Res&& __r)
993 auto __setter = _State::__setter(
this, std::move(__r));
994 _M_future->_M_set_result(std::move(__setter));
998 set_exception(exception_ptr __p)
1000 auto __setter = _State::__setter(__p,
this);
1001 _M_future->_M_set_result(std::move(__setter));
1005 template<
typename _Res>
1007 swap(promise<_Res>& __x, promise<_Res>& __y) noexcept
1010 template<
typename _Res,
typename _Alloc>
1011 struct uses_allocator<promise<_Res>, _Alloc>
1016 template<
typename _Res>
1017 class promise<_Res&>
1019 typedef __future_base::_State_base _State;
1020 typedef __future_base::_Result<_Res&> _Res_type;
1021 typedef __future_base::_Ptr<_Res_type> _Ptr_type;
1022 template<
typename,
typename>
friend class _State::_Setter;
1024 shared_ptr<_State> _M_future;
1025 _Ptr_type _M_storage;
1030 _M_storage(new _Res_type())
1033 promise(promise&& __rhs) noexcept
1034 : _M_future(std::move(__rhs._M_future)),
1035 _M_storage(std::move(__rhs._M_storage))
1038 template<
typename _Allocator>
1039 promise(allocator_arg_t,
const _Allocator& __a)
1041 _M_storage(__future_base::_S_allocate_result<_Res&>(__a))
1044 template<
typename _Allocator>
1045 promise(allocator_arg_t,
const _Allocator&, promise&& __rhs)
1046 : _M_future(std::move(__rhs._M_future)),
1047 _M_storage(std::move(__rhs._M_storage))
1050 promise(
const promise&) =
delete;
1054 if (static_cast<bool>(_M_future) && !_M_future.unique())
1055 _M_future->_M_break_promise(std::move(_M_storage));
1060 operator=(promise&& __rhs) noexcept
1062 promise(std::move(__rhs)).swap(*
this);
1066 promise& operator=(
const promise&) =
delete;
1069 swap(promise& __rhs) noexcept
1071 _M_future.swap(__rhs._M_future);
1072 _M_storage.swap(__rhs._M_storage);
1078 {
return future<_Res&>(_M_future); }
1082 set_value(_Res& __r)
1084 auto __setter = _State::__setter(
this, __r);
1085 _M_future->_M_set_result(std::move(__setter));
1089 set_exception(exception_ptr __p)
1091 auto __setter = _State::__setter(__p,
this);
1092 _M_future->_M_set_result(std::move(__setter));
1100 typedef __future_base::_State_base _State;
1101 typedef __future_base::_Result<void> _Res_type;
1102 typedef __future_base::_Ptr<_Res_type> _Ptr_type;
1103 template<
typename,
typename>
friend class _State::_Setter;
1105 shared_ptr<_State> _M_future;
1106 _Ptr_type _M_storage;
1111 _M_storage(new _Res_type())
1114 promise(promise&& __rhs) noexcept
1115 : _M_future(std::move(__rhs._M_future)),
1116 _M_storage(std::move(__rhs._M_storage))
1119 template<
typename _Allocator>
1120 promise(allocator_arg_t,
const _Allocator& __a)
1122 _M_storage(__future_base::_S_allocate_result<void>(__a))
1127 template<
typename _Allocator>
1128 promise(allocator_arg_t,
const _Allocator&, promise&& __rhs)
1129 : _M_future(std::move(__rhs._M_future)),
1130 _M_storage(std::move(__rhs._M_storage))
1133 promise(
const promise&) =
delete;
1137 if (static_cast<bool>(_M_future) && !_M_future.unique())
1138 _M_future->_M_break_promise(std::move(_M_storage));
1143 operator=(promise&& __rhs) noexcept
1145 promise(std::move(__rhs)).swap(*
this);
1149 promise& operator=(
const promise&) =
delete;
1152 swap(promise& __rhs) noexcept
1154 _M_future.swap(__rhs._M_future);
1155 _M_storage.swap(__rhs._M_storage);
1161 {
return future<void>(_M_future); }
1167 set_exception(exception_ptr __p)
1169 auto __setter = _State::__setter(__p,
this);
1170 _M_future->_M_set_result(std::move(__setter));
1176 struct __future_base::_State_base::_Setter<void, void>
1178 promise<void>::_Ptr_type operator()()
1180 _State_base::_S_check(_M_promise->_M_future);
1181 return std::move(_M_promise->_M_storage);
1184 promise<void>* _M_promise;
1187 inline __future_base::_State_base::_Setter<void, void>
1188 __future_base::_State_base::__setter(promise<void>* __prom)
1190 return _Setter<void, void>{ __prom };
1194 promise<void>::set_value()
1196 auto __setter = _State::__setter(
this);
1197 _M_future->_M_set_result(std::move(__setter));
1201 template<
typename _Ptr_type,
typename _Res>
1202 struct __future_base::_Task_setter
1204 _Ptr_type operator()()
1208 _M_result->_M_set(_M_fn());
1214 return std::move(_M_result);
1216 _Ptr_type& _M_result;
1217 std::function<_Res()> _M_fn;
1220 template<
typename _Ptr_type>
1221 struct __future_base::_Task_setter<_Ptr_type, void>
1223 _Ptr_type operator()()
1233 return std::move(_M_result);
1235 _Ptr_type& _M_result;
1236 std::function<void()> _M_fn;
1239 template<
typename _Res,
typename... _Args>
1240 struct __future_base::_Task_state_base<_Res(_Args...)>
1241 : __future_base::_State_base
1243 typedef _Res _Res_type;
1245 template<
typename _Alloc>
1246 _Task_state_base(
const _Alloc& __a)
1247 : _M_result(_S_allocate_result<_Res>(__a))
1251 _M_run(_Args... __args) = 0;
1253 virtual shared_ptr<_Task_state_base>
1256 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1257 _Ptr_type _M_result;
1260 template<
typename _Fn,
typename _Alloc,
typename _Res,
typename... _Args>
1261 struct __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)> final
1262 : __future_base::_Task_state_base<_Res(_Args...)>
1264 _Task_state(_Fn&& __fn,
const _Alloc& __a)
1265 : _Task_state_base<_Res(_Args...)>(__a), _M_impl(std::move(__fn), __a)
1270 _M_run(_Args... __args)
1273 auto __boundfn = std::__bind_simple(
std::ref(_M_impl._M_fn),
1274 _S_maybe_wrap_ref(std::forward<_Args>(__args))...);
1275 auto __setter = _S_task_setter(this->_M_result, std::move(__boundfn));
1276 this->_M_set_result(std::move(__setter));
1279 virtual shared_ptr<_Task_state_base<_Res(_Args...)>>
1282 template<
typename _Tp>
1283 static reference_wrapper<_Tp>
1284 _S_maybe_wrap_ref(_Tp& __t)
1287 template<
typename _Tp>
1289 typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp>::type&&
1290 _S_maybe_wrap_ref(_Tp&& __t)
1291 {
return std::forward<_Tp>(__t); }
1293 struct _Impl : _Alloc
1295 _Impl(_Fn&& __fn,
const _Alloc& __a)
1296 : _Alloc(__a), _M_fn(std::move(__fn)) { }
1301 template<
typename _Signature,
typename _Fn,
typename _Alloc>
1302 static shared_ptr<__future_base::_Task_state_base<_Signature>>
1303 __create_task_state(_Fn&& __fn,
const _Alloc& __a)
1305 typedef __future_base::_Task_state<_Fn, _Alloc, _Signature> _State;
1306 return std::allocate_shared<_State>(__a, std::move(__fn), __a);
1309 template<
typename _Fn,
typename _Alloc,
typename _Res,
typename... _Args>
1310 shared_ptr<__future_base::_Task_state_base<_Res(_Args...)>>
1311 __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)>::_M_reset()
1313 return __create_task_state<_Res(_Args...)>(std::move(_M_impl._M_fn),
1314 static_cast<_Alloc&
>(_M_impl));
1317 template<
typename _Task,
typename _Fn,
bool
1318 = is_same<_Task, typename decay<_Fn>::type>::value>
1319 struct __constrain_pkgdtask
1320 {
typedef void __type; };
1322 template<
typename _Task,
typename _Fn>
1323 struct __constrain_pkgdtask<_Task, _Fn, true>
1327 template<
typename _Res,
typename... _ArgTypes>
1328 class packaged_task<_Res(_ArgTypes...)>
1330 typedef __future_base::_Task_state_base<_Res(_ArgTypes...)> _State_type;
1331 shared_ptr<_State_type> _M_state;
1335 packaged_task() noexcept { }
1339 template<
typename _Allocator>
1340 packaged_task(allocator_arg_t,
const _Allocator& __a) noexcept
1343 template<
typename _Fn,
typename =
typename
1344 __constrain_pkgdtask<packaged_task, _Fn>::__type>
1346 packaged_task(_Fn&& __fn)
1347 : packaged_task(allocator_arg, std::allocator<int>(), std::move(__fn))
1352 template<
typename _Fn,
typename _Alloc,
typename =
typename
1353 __constrain_pkgdtask<packaged_task, _Fn>::__type>
1355 packaged_task(allocator_arg_t,
const _Alloc& __a, _Fn&& __fn)
1356 : _M_state(__create_task_state<_Res(_ArgTypes...)>(
1357 std::
forward<_Fn>(__fn), __a))
1362 if (static_cast<bool>(_M_state) && !_M_state.unique())
1363 _M_state->_M_break_promise(std::move(_M_state->_M_result));
1367 packaged_task(
const packaged_task&) =
delete;
1368 packaged_task& operator=(
const packaged_task&) =
delete;
1370 template<
typename _Allocator>
1371 packaged_task(allocator_arg_t,
const _Allocator&,
1372 const packaged_task&) =
delete;
1375 packaged_task(packaged_task&& __other) noexcept
1376 { this->swap(__other); }
1378 template<
typename _Allocator>
1379 packaged_task(allocator_arg_t,
const _Allocator&,
1380 packaged_task&& __other) noexcept
1381 { this->swap(__other); }
1383 packaged_task& operator=(packaged_task&& __other) noexcept
1385 packaged_task(std::move(__other)).swap(*
this);
1390 swap(packaged_task& __other) noexcept
1391 { _M_state.swap(__other._M_state); }
1394 valid() const noexcept
1395 {
return static_cast<bool>(_M_state); }
1400 {
return future<_Res>(_M_state); }
1404 operator()(_ArgTypes... __args)
1406 __future_base::_State_base::_S_check(_M_state);
1407 _M_state->_M_run(std::forward<_ArgTypes>(__args)...);
1413 __future_base::_State_base::_S_check(_M_state);
1414 packaged_task __tmp;
1415 __tmp._M_state = _M_state;
1416 _M_state = _M_state->_M_reset();
1421 template<
typename _Res,
typename... _ArgTypes>
1423 swap(packaged_task<_Res(_ArgTypes...)>& __x,
1424 packaged_task<_Res(_ArgTypes...)>& __y) noexcept
1427 template<
typename _Res,
typename _Alloc>
1428 struct uses_allocator<packaged_task<_Res>, _Alloc>
1432 template<
typename _BoundFn,
typename _Res>
1433 class __future_base::_Deferred_state final
1434 :
public __future_base::_State_base
1438 _Deferred_state(_BoundFn&& __fn)
1439 : _M_result(new _Result<_Res>()), _M_fn(std::move(__fn))
1443 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1444 _Ptr_type _M_result;
1451 _M_set_result(_S_task_setter(_M_result, _M_fn),
true);
1455 class __future_base::_Async_state_common :
public __future_base::_State_base
1458 #ifdef _GLIBCXX_ASYNC_ABI_COMPAT
1459 ~_Async_state_common();
1461 ~_Async_state_common() =
default;
1466 virtual void _M_run_deferred() { _M_join(); }
1474 template<
typename _BoundFn,
typename _Res>
1475 class __future_base::_Async_state_impl final
1476 :
public __future_base::_Async_state_common
1480 _Async_state_impl(_BoundFn&& __fn)
1481 : _M_result(new _Result<_Res>()), _M_fn(std::move(__fn))
1484 _M_set_result(_S_task_setter(_M_result, _M_fn));
1488 ~_Async_state_impl() { _M_join(); }
1491 typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type;
1492 _Ptr_type _M_result;
1496 template<
typename _BoundFn>
1498 __future_base::_S_make_deferred_state(_BoundFn&& __fn)
1500 typedef typename remove_reference<_BoundFn>::type __fn_type;
1501 typedef _Deferred_state<__fn_type> __state_type;
1502 return std::make_shared<__state_type>(std::move(__fn));
1505 template<
typename _BoundFn>
1507 __future_base::_S_make_async_state(_BoundFn&& __fn)
1509 typedef typename remove_reference<_BoundFn>::type __fn_type;
1510 typedef _Async_state_impl<__fn_type> __state_type;
1511 return std::make_shared<__state_type>(std::move(__fn));
1516 template<
typename _Fn,
typename... _Args>
1517 future<
typename result_of<_Fn(_Args...)>::type>
1518 async(
launch __policy, _Fn&& __fn, _Args&&... __args)
1520 typedef typename result_of<_Fn(_Args...)>::type result_type;
1522 if ((__policy & (launch::async|launch::deferred)) == launch::async)
1524 __state = __future_base::_S_make_async_state(std::__bind_simple(
1525 std::forward<_Fn>(__fn), std::forward<_Args>(__args)...));
1529 __state = __future_base::_S_make_deferred_state(std::__bind_simple(
1530 std::forward<_Fn>(__fn), std::forward<_Args>(__args)...));
1532 return future<result_type>(__state);
1536 template<
typename _Fn,
typename... _Args>
1537 inline future<
typename result_of<_Fn(_Args...)>::type>
1538 async(_Fn&& __fn, _Args&&... __args)
1540 return async(launch::async|launch::deferred, std::forward<_Fn>(__fn),
1541 std::forward<_Args>(__args)...);
1544 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
1548 _GLIBCXX_END_NAMESPACE_VERSION
1553 #endif // _GLIBCXX_FUTURE