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future
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// -*- C++ -*-
//===--------------------------- future -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_FUTURE
#define _LIBCPP_FUTURE
/*
future synopsis
namespace std
{
enum class future_errc
{
future_already_retrieved = 1,
promise_already_satisfied,
no_state,
broken_promise
};
enum class launch
{
async = 1,
deferred = 2,
any = async | deferred
};
enum class future_status
{
ready,
timeout,
deferred
};
template <> struct is_error_code_enum<future_errc> : public true_type { };
error_code make_error_code(future_errc e) noexcept;
error_condition make_error_condition(future_errc e) noexcept;
const error_category& future_category() noexcept;
class future_error
: public logic_error
{
public:
future_error(error_code ec); // exposition only
explicit future_error(future_errc); // C++17
const error_code& code() const noexcept;
const char* what() const noexcept;
};
template <class R>
class promise
{
public:
promise();
template <class Allocator>
promise(allocator_arg_t, const Allocator& a);
promise(promise&& rhs) noexcept;
promise(const promise& rhs) = delete;
~promise();
// assignment
promise& operator=(promise&& rhs) noexcept;
promise& operator=(const promise& rhs) = delete;
void swap(promise& other) noexcept;
// retrieving the result
future<R> get_future();
// setting the result
void set_value(const R& r);
void set_value(R&& r);
void set_exception(exception_ptr p);
// setting the result with deferred notification
void set_value_at_thread_exit(const R& r);
void set_value_at_thread_exit(R&& r);
void set_exception_at_thread_exit(exception_ptr p);
};
template <class R>
class promise<R&>
{
public:
promise();
template <class Allocator>
promise(allocator_arg_t, const Allocator& a);
promise(promise&& rhs) noexcept;
promise(const promise& rhs) = delete;
~promise();
// assignment
promise& operator=(promise&& rhs) noexcept;
promise& operator=(const promise& rhs) = delete;
void swap(promise& other) noexcept;
// retrieving the result
future<R&> get_future();
// setting the result
void set_value(R& r);
void set_exception(exception_ptr p);
// setting the result with deferred notification
void set_value_at_thread_exit(R&);
void set_exception_at_thread_exit(exception_ptr p);
};
template <>
class promise<void>
{
public:
promise();
template <class Allocator>
promise(allocator_arg_t, const Allocator& a);
promise(promise&& rhs) noexcept;
promise(const promise& rhs) = delete;
~promise();
// assignment
promise& operator=(promise&& rhs) noexcept;
promise& operator=(const promise& rhs) = delete;
void swap(promise& other) noexcept;
// retrieving the result
future<void> get_future();
// setting the result
void set_value();
void set_exception(exception_ptr p);
// setting the result with deferred notification
void set_value_at_thread_exit();
void set_exception_at_thread_exit(exception_ptr p);
};
template <class R> void swap(promise<R>& x, promise<R>& y) noexcept;
template <class R, class Alloc>
struct uses_allocator<promise<R>, Alloc> : public true_type {};
template <class R>
class future
{
public:
future() noexcept;
future(future&&) noexcept;
future(const future& rhs) = delete;
~future();
future& operator=(const future& rhs) = delete;
future& operator=(future&&) noexcept;
shared_future<R> share() noexcept;
// retrieving the value
R get();
// functions to check state
bool valid() const noexcept;
void wait() const;
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const;
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
};
template <class R>
class future<R&>
{
public:
future() noexcept;
future(future&&) noexcept;
future(const future& rhs) = delete;
~future();
future& operator=(const future& rhs) = delete;
future& operator=(future&&) noexcept;
shared_future<R&> share() noexcept;
// retrieving the value
R& get();
// functions to check state
bool valid() const noexcept;
void wait() const;
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const;
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
};
template <>
class future<void>
{
public:
future() noexcept;
future(future&&) noexcept;
future(const future& rhs) = delete;
~future();
future& operator=(const future& rhs) = delete;
future& operator=(future&&) noexcept;
shared_future<void> share() noexcept;
// retrieving the value
void get();
// functions to check state
bool valid() const noexcept;
void wait() const;
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const;
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
};
template <class R>
class shared_future
{
public:
shared_future() noexcept;
shared_future(const shared_future& rhs);
shared_future(future<R>&&) noexcept;
shared_future(shared_future&& rhs) noexcept;
~shared_future();
shared_future& operator=(const shared_future& rhs);
shared_future& operator=(shared_future&& rhs) noexcept;
// retrieving the value
const R& get() const;
// functions to check state
bool valid() const noexcept;
void wait() const;
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const;
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
};
template <class R>
class shared_future<R&>
{
public:
shared_future() noexcept;
shared_future(const shared_future& rhs);
shared_future(future<R&>&&) noexcept;
shared_future(shared_future&& rhs) noexcept;
~shared_future();
shared_future& operator=(const shared_future& rhs);
shared_future& operator=(shared_future&& rhs) noexcept;
// retrieving the value
R& get() const;
// functions to check state
bool valid() const noexcept;
void wait() const;
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const;
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
};
template <>
class shared_future<void>
{
public:
shared_future() noexcept;
shared_future(const shared_future& rhs);
shared_future(future<void>&&) noexcept;
shared_future(shared_future&& rhs) noexcept;
~shared_future();
shared_future& operator=(const shared_future& rhs);
shared_future& operator=(shared_future&& rhs) noexcept;
// retrieving the value
void get() const;
// functions to check state
bool valid() const noexcept;
void wait() const;
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const;
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
};
template <class F, class... Args>
future<typename result_of<typename decay<F>::type(typename decay<Args>::type...)>::type>
async(F&& f, Args&&... args);
template <class F, class... Args>
future<typename result_of<typename decay<F>::type(typename decay<Args>::type...)>::type>
async(launch policy, F&& f, Args&&... args);
template <class> class packaged_task; // undefined
template <class R, class... ArgTypes>
class packaged_task<R(ArgTypes...)>
{
public:
typedef R result_type; // extension
// construction and destruction
packaged_task() noexcept;
template <class F>
explicit packaged_task(F&& f);
template <class F, class Allocator>
packaged_task(allocator_arg_t, const Allocator& a, F&& f);
~packaged_task();
// no copy
packaged_task(const packaged_task&) = delete;
packaged_task& operator=(const packaged_task&) = delete;
// move support
packaged_task(packaged_task&& other) noexcept;
packaged_task& operator=(packaged_task&& other) noexcept;
void swap(packaged_task& other) noexcept;
bool valid() const noexcept;
// result retrieval
future<R> get_future();
// execution
void operator()(ArgTypes... );
void make_ready_at_thread_exit(ArgTypes...);
void reset();
};
template <class R>
void swap(packaged_task<R(ArgTypes...)&, packaged_task<R(ArgTypes...)>&) noexcept;
template <class R, class Alloc> struct uses_allocator<packaged_task<R>, Alloc>;
} // std
*/
#include <__config>
#include <system_error>
#include <memory>
#include <chrono>
#include <exception>
#include <mutex>
#include <thread>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
#ifdef _LIBCPP_HAS_NO_THREADS
#error <future> is not supported on this single threaded system
#else // !_LIBCPP_HAS_NO_THREADS
_LIBCPP_BEGIN_NAMESPACE_STD
//enum class future_errc
_LIBCPP_DECLARE_STRONG_ENUM(future_errc)
{
future_already_retrieved = 1,
promise_already_satisfied,
no_state,
broken_promise
};
_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(future_errc)
template <>
struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<future_errc> : public true_type {};
#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
template <>
struct _LIBCPP_TEMPLATE_VIS is_error_code_enum<future_errc::__lx> : public true_type { };
#endif
//enum class launch
_LIBCPP_DECLARE_STRONG_ENUM(launch)
{
async = 1,
deferred = 2,
any = async | deferred
};
_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(launch)
#ifndef _LIBCPP_HAS_NO_STRONG_ENUMS
typedef underlying_type<launch>::type __launch_underlying_type;
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
launch
operator&(launch __x, launch __y)
{
return static_cast<launch>(static_cast<__launch_underlying_type>(__x) &
static_cast<__launch_underlying_type>(__y));
}
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
launch
operator|(launch __x, launch __y)
{
return static_cast<launch>(static_cast<__launch_underlying_type>(__x) |
static_cast<__launch_underlying_type>(__y));
}
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
launch
operator^(launch __x, launch __y)
{
return static_cast<launch>(static_cast<__launch_underlying_type>(__x) ^
static_cast<__launch_underlying_type>(__y));
}
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR
launch
operator~(launch __x)
{
return static_cast<launch>(~static_cast<__launch_underlying_type>(__x) & 3);
}
inline _LIBCPP_INLINE_VISIBILITY
launch&
operator&=(launch& __x, launch __y)
{
__x = __x & __y; return __x;
}
inline _LIBCPP_INLINE_VISIBILITY
launch&
operator|=(launch& __x, launch __y)
{
__x = __x | __y; return __x;
}
inline _LIBCPP_INLINE_VISIBILITY
launch&
operator^=(launch& __x, launch __y)
{
__x = __x ^ __y; return __x;
}
#endif // !_LIBCPP_HAS_NO_STRONG_ENUMS
//enum class future_status
_LIBCPP_DECLARE_STRONG_ENUM(future_status)
{
ready,
timeout,
deferred
};
_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(future_status)
_LIBCPP_FUNC_VIS
const error_category& future_category() _NOEXCEPT;
inline _LIBCPP_INLINE_VISIBILITY
error_code
make_error_code(future_errc __e) _NOEXCEPT
{
return error_code(static_cast<int>(__e), future_category());
}
inline _LIBCPP_INLINE_VISIBILITY
error_condition
make_error_condition(future_errc __e) _NOEXCEPT
{
return error_condition(static_cast<int>(__e), future_category());
}
class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_FUTURE_ERROR future_error
: public logic_error
{
error_code __ec_;
public:
future_error(error_code __ec);
#if _LIBCPP_STD_VERS > 14
explicit future_error(future_errc _Ev) : logic_error(), __ec_(make_error_code(_Ev)) {}
#endif
_LIBCPP_INLINE_VISIBILITY
const error_code& code() const _NOEXCEPT {return __ec_;}
virtual ~future_error() _NOEXCEPT;
};
_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_NO_EXCEPTIONS
_LIBCPP_AVAILABILITY_FUTURE_ERROR
#endif
void __throw_future_error(future_errc _Ev)
{
#ifndef _LIBCPP_NO_EXCEPTIONS
throw future_error(make_error_code(_Ev));
#else
((void)_Ev);
_VSTD::abort();
#endif
}
class _LIBCPP_TYPE_VIS _LIBCPP_AVAILABILITY_FUTURE __assoc_sub_state
: public __shared_count
{
protected:
exception_ptr __exception_;
mutable mutex __mut_;
mutable condition_variable __cv_;
unsigned __state_;
virtual void __on_zero_shared() _NOEXCEPT;
void __sub_wait(unique_lock<mutex>& __lk);
public:
enum
{
__constructed = 1,
__future_attached = 2,
ready = 4,
deferred = 8
};
_LIBCPP_INLINE_VISIBILITY
__assoc_sub_state() : __state_(0) {}
_LIBCPP_INLINE_VISIBILITY
bool __has_value() const
{return (__state_ & __constructed) || (__exception_ != nullptr);}
_LIBCPP_INLINE_VISIBILITY
void __attach_future() {
lock_guard<mutex> __lk(__mut_);
bool __has_future_attached = (__state_ & __future_attached) != 0;
if (__has_future_attached)
__throw_future_error(future_errc::future_already_retrieved);
this->__add_shared();
__state_ |= __future_attached;
}
_LIBCPP_INLINE_VISIBILITY
void __set_deferred() {__state_ |= deferred;}
void __make_ready();
_LIBCPP_INLINE_VISIBILITY
bool __is_ready() const {return (__state_ & ready) != 0;}
void set_value();
void set_value_at_thread_exit();
void set_exception(exception_ptr __p);
void set_exception_at_thread_exit(exception_ptr __p);
void copy();
void wait();
template <class _Rep, class _Period>
future_status
_LIBCPP_INLINE_VISIBILITY
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const;
template <class _Clock, class _Duration>
_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const;
virtual void __execute();
};
template <class _Clock, class _Duration>
future_status
__assoc_sub_state::wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{
unique_lock<mutex> __lk(__mut_);
if (__state_ & deferred)
return future_status::deferred;
while (!(__state_ & ready) && _Clock::now() < __abs_time)
__cv_.wait_until(__lk, __abs_time);
if (__state_ & ready)
return future_status::ready;
return future_status::timeout;
}
template <class _Rep, class _Period>
inline
future_status
__assoc_sub_state::wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{
return wait_until(chrono::steady_clock::now() + __rel_time);
}
template <class _Rp>
class _LIBCPP_AVAILABILITY_FUTURE __assoc_state
: public __assoc_sub_state
{
typedef __assoc_sub_state base;
typedef typename aligned_storage<sizeof(_Rp), alignment_of<_Rp>::value>::type _Up;
protected:
_Up __value_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
template <class _Arg>
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
void set_value(_Arg&& __arg);
#else
void set_value(_Arg& __arg);
#endif
template <class _Arg>
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
void set_value_at_thread_exit(_Arg&& __arg);
#else
void set_value_at_thread_exit(_Arg& __arg);
#endif
_Rp move();
typename add_lvalue_reference<_Rp>::type copy();
};
template <class _Rp>
void
__assoc_state<_Rp>::__on_zero_shared() _NOEXCEPT
{
if (this->__state_ & base::__constructed)
reinterpret_cast<_Rp*>(&__value_)->~_Rp();
delete this;
}
template <class _Rp>
template <class _Arg>
_LIBCPP_AVAILABILITY_FUTURE
void
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
__assoc_state<_Rp>::set_value(_Arg&& __arg)
#else
__assoc_state<_Rp>::set_value(_Arg& __arg)
#endif
{
unique_lock<mutex> __lk(this->__mut_);
if (this->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
::new(&__value_) _Rp(_VSTD::forward<_Arg>(__arg));
this->__state_ |= base::__constructed | base::ready;
__cv_.notify_all();
}
template <class _Rp>
template <class _Arg>
void
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
__assoc_state<_Rp>::set_value_at_thread_exit(_Arg&& __arg)
#else
__assoc_state<_Rp>::set_value_at_thread_exit(_Arg& __arg)
#endif
{
unique_lock<mutex> __lk(this->__mut_);
if (this->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
::new(&__value_) _Rp(_VSTD::forward<_Arg>(__arg));
this->__state_ |= base::__constructed;
__thread_local_data()->__make_ready_at_thread_exit(this);
}
template <class _Rp>
_Rp
__assoc_state<_Rp>::move()
{
unique_lock<mutex> __lk(this->__mut_);
this->__sub_wait(__lk);
if (this->__exception_ != nullptr)
rethrow_exception(this->__exception_);
return _VSTD::move(*reinterpret_cast<_Rp*>(&__value_));
}
template <class _Rp>
typename add_lvalue_reference<_Rp>::type
__assoc_state<_Rp>::copy()
{
unique_lock<mutex> __lk(this->__mut_);
this->__sub_wait(__lk);
if (this->__exception_ != nullptr)
rethrow_exception(this->__exception_);
return *reinterpret_cast<_Rp*>(&__value_);
}
template <class _Rp>
class _LIBCPP_AVAILABILITY_FUTURE __assoc_state<_Rp&>
: public __assoc_sub_state
{
typedef __assoc_sub_state base;
typedef _Rp* _Up;
protected:
_Up __value_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
void set_value(_Rp& __arg);
void set_value_at_thread_exit(_Rp& __arg);
_Rp& copy();
};
template <class _Rp>
void
__assoc_state<_Rp&>::__on_zero_shared() _NOEXCEPT
{
delete this;
}
template <class _Rp>
void
__assoc_state<_Rp&>::set_value(_Rp& __arg)
{
unique_lock<mutex> __lk(this->__mut_);
if (this->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
__value_ = _VSTD::addressof(__arg);
this->__state_ |= base::__constructed | base::ready;
__cv_.notify_all();
}
template <class _Rp>
void
__assoc_state<_Rp&>::set_value_at_thread_exit(_Rp& __arg)
{
unique_lock<mutex> __lk(this->__mut_);
if (this->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
__value_ = _VSTD::addressof(__arg);
this->__state_ |= base::__constructed;
__thread_local_data()->__make_ready_at_thread_exit(this);
}
template <class _Rp>
_Rp&
__assoc_state<_Rp&>::copy()
{
unique_lock<mutex> __lk(this->__mut_);
this->__sub_wait(__lk);
if (this->__exception_ != nullptr)
rethrow_exception(this->__exception_);
return *__value_;
}
template <class _Rp, class _Alloc>
class _LIBCPP_AVAILABILITY_FUTURE __assoc_state_alloc
: public __assoc_state<_Rp>
{
typedef __assoc_state<_Rp> base;
_Alloc __alloc_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
_LIBCPP_INLINE_VISIBILITY
explicit __assoc_state_alloc(const _Alloc& __a)
: __alloc_(__a) {}
};
template <class _Rp, class _Alloc>
void
__assoc_state_alloc<_Rp, _Alloc>::__on_zero_shared() _NOEXCEPT
{
if (this->__state_ & base::__constructed)
reinterpret_cast<_Rp*>(_VSTD::addressof(this->__value_))->~_Rp();
typedef typename __allocator_traits_rebind<_Alloc, __assoc_state_alloc>::type _Al;
typedef allocator_traits<_Al> _ATraits;
typedef pointer_traits<typename _ATraits::pointer> _PTraits;
_Al __a(__alloc_);
this->~__assoc_state_alloc();
__a.deallocate(_PTraits::pointer_to(*this), 1);
}
template <class _Rp, class _Alloc>
class _LIBCPP_AVAILABILITY_FUTURE __assoc_state_alloc<_Rp&, _Alloc>
: public __assoc_state<_Rp&>
{
typedef __assoc_state<_Rp&> base;
_Alloc __alloc_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
_LIBCPP_INLINE_VISIBILITY
explicit __assoc_state_alloc(const _Alloc& __a)
: __alloc_(__a) {}
};
template <class _Rp, class _Alloc>
void
__assoc_state_alloc<_Rp&, _Alloc>::__on_zero_shared() _NOEXCEPT
{
typedef typename __allocator_traits_rebind<_Alloc, __assoc_state_alloc>::type _Al;
typedef allocator_traits<_Al> _ATraits;
typedef pointer_traits<typename _ATraits::pointer> _PTraits;
_Al __a(__alloc_);
this->~__assoc_state_alloc();
__a.deallocate(_PTraits::pointer_to(*this), 1);
}
template <class _Alloc>
class _LIBCPP_AVAILABILITY_FUTURE __assoc_sub_state_alloc
: public __assoc_sub_state
{
typedef __assoc_sub_state base;
_Alloc __alloc_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
_LIBCPP_INLINE_VISIBILITY
explicit __assoc_sub_state_alloc(const _Alloc& __a)
: __alloc_(__a) {}
};
template <class _Alloc>
void
__assoc_sub_state_alloc<_Alloc>::__on_zero_shared() _NOEXCEPT
{
typedef typename __allocator_traits_rebind<_Alloc, __assoc_sub_state_alloc>::type _Al;
typedef allocator_traits<_Al> _ATraits;
typedef pointer_traits<typename _ATraits::pointer> _PTraits;
_Al __a(__alloc_);
this->~__assoc_sub_state_alloc();
__a.deallocate(_PTraits::pointer_to(*this), 1);
}
template <class _Rp, class _Fp>
class _LIBCPP_AVAILABILITY_FUTURE __deferred_assoc_state
: public __assoc_state<_Rp>
{
typedef __assoc_state<_Rp> base;
_Fp __func_;
public:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_INLINE_VISIBILITY
explicit __deferred_assoc_state(_Fp&& __f);
#endif
virtual void __execute();
};
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Rp, class _Fp>
inline
__deferred_assoc_state<_Rp, _Fp>::__deferred_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
this->__set_deferred();
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Rp, class _Fp>
void
__deferred_assoc_state<_Rp, _Fp>::__execute()
{
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
this->set_value(__func_());
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
this->set_exception(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template <class _Fp>
class _LIBCPP_AVAILABILITY_FUTURE __deferred_assoc_state<void, _Fp>
: public __assoc_sub_state
{
typedef __assoc_sub_state base;
_Fp __func_;
public:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_INLINE_VISIBILITY
explicit __deferred_assoc_state(_Fp&& __f);
#endif
virtual void __execute();
};
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Fp>
inline
__deferred_assoc_state<void, _Fp>::__deferred_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
this->__set_deferred();
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Fp>
void
__deferred_assoc_state<void, _Fp>::__execute()
{
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
__func_();
this->set_value();
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
this->set_exception(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template <class _Rp, class _Fp>
class _LIBCPP_AVAILABILITY_FUTURE __async_assoc_state
: public __assoc_state<_Rp>
{
typedef __assoc_state<_Rp> base;
_Fp __func_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_INLINE_VISIBILITY
explicit __async_assoc_state(_Fp&& __f);
#endif
virtual void __execute();
};
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Rp, class _Fp>
inline
__async_assoc_state<_Rp, _Fp>::__async_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Rp, class _Fp>
void
__async_assoc_state<_Rp, _Fp>::__execute()
{
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
this->set_value(__func_());
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
this->set_exception(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template <class _Rp, class _Fp>
void
__async_assoc_state<_Rp, _Fp>::__on_zero_shared() _NOEXCEPT
{
this->wait();
base::__on_zero_shared();
}
template <class _Fp>
class _LIBCPP_AVAILABILITY_FUTURE __async_assoc_state<void, _Fp>