llvm-project/libcxx/include/future

2463 lines
66 KiB
C++

// -*- 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 <__availability>
#include <__config>
#include <__debug>
#include <__memory/allocator_arg_t.h>
#include <__memory/uses_allocator.h>
#include <__utility/__decay_copy.h>
#include <__utility/forward.h>
#include <chrono>
#include <exception>
#include <memory>
#include <mutex>
#include <system_error>
#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);
_LIBCPP_INLINE_VISIBILITY
const error_code& code() const _NOEXCEPT {return __ec_;}
future_error(const future_error&) _NOEXCEPT = default;
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 _LIBCPP_HIDDEN __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>
void set_value(_Arg&& __arg);
template <class _Arg>
void set_value_at_thread_exit(_Arg&& __arg);
_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
__assoc_state<_Rp>::set_value(_Arg&& __arg)
{
unique_lock<mutex> __lk(this->__mut_);
if (this->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
::new ((void*)&__value_) _Rp(_VSTD::forward<_Arg>(__arg));
this->__state_ |= base::__constructed | base::ready;
__cv_.notify_all();
}
template <class _Rp>
template <class _Arg>
void
__assoc_state<_Rp>::set_value_at_thread_exit(_Arg&& __arg)
{
unique_lock<mutex> __lk(this->__mut_);
if (this->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
::new ((void*)&__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:
_LIBCPP_INLINE_VISIBILITY
explicit __deferred_assoc_state(_Fp&& __f);
virtual void __execute();
};
template <class _Rp, class _Fp>
inline
__deferred_assoc_state<_Rp, _Fp>::__deferred_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
this->__set_deferred();
}
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:
_LIBCPP_INLINE_VISIBILITY
explicit __deferred_assoc_state(_Fp&& __f);
virtual void __execute();
};
template <class _Fp>
inline
__deferred_assoc_state<void, _Fp>::__deferred_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
this->__set_deferred();
}
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:
_LIBCPP_INLINE_VISIBILITY
explicit __async_assoc_state(_Fp&& __f);
virtual void __execute();
};
template <class _Rp, class _Fp>
inline
__async_assoc_state<_Rp, _Fp>::__async_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
}
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>
: public __assoc_sub_state
{
typedef __assoc_sub_state base;
_Fp __func_;
virtual void __on_zero_shared() _NOEXCEPT;
public:
_LIBCPP_INLINE_VISIBILITY
explicit __async_assoc_state(_Fp&& __f);
virtual void __execute();
};
template <class _Fp>
inline
__async_assoc_state<void, _Fp>::__async_assoc_state(_Fp&& __f)
: __func_(_VSTD::forward<_Fp>(__f))
{
}
template <class _Fp>
void
__async_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 _Fp>
void
__async_assoc_state<void, _Fp>::__on_zero_shared() _NOEXCEPT
{
this->wait();
base::__on_zero_shared();
}
template <class _Rp> class _LIBCPP_TEMPLATE_VIS promise;
template <class _Rp> class _LIBCPP_TEMPLATE_VIS shared_future;
// future
template <class _Rp> class _LIBCPP_TEMPLATE_VIS future;
template <class _Rp, class _Fp>
_LIBCPP_INLINE_VISIBILITY future<_Rp>
__make_deferred_assoc_state(_Fp&& __f);
template <class _Rp, class _Fp>
_LIBCPP_INLINE_VISIBILITY future<_Rp>
__make_async_assoc_state(_Fp&& __f);
template <class _Rp>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FUTURE future
{
__assoc_state<_Rp>* __state_;
explicit future(__assoc_state<_Rp>* __state);
template <class> friend class promise;
template <class> friend class shared_future;
template <class _R1, class _Fp>
friend future<_R1> __make_deferred_assoc_state(_Fp&& __f);
template <class _R1, class _Fp>
friend future<_R1> __make_async_assoc_state(_Fp&& __f);
public:
_LIBCPP_INLINE_VISIBILITY
future() _NOEXCEPT : __state_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
future(future&& __rhs) _NOEXCEPT
: __state_(__rhs.__state_) {__rhs.__state_ = nullptr;}
future(const future&) = delete;
future& operator=(const future&) = delete;
_LIBCPP_INLINE_VISIBILITY
future& operator=(future&& __rhs) _NOEXCEPT
{
future(_VSTD::move(__rhs)).swap(*this);
return *this;
}
~future();
_LIBCPP_INLINE_VISIBILITY
shared_future<_Rp> share() _NOEXCEPT;
// retrieving the value
_Rp get();
_LIBCPP_INLINE_VISIBILITY
void swap(future& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// functions to check state
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __state_ != nullptr;}
_LIBCPP_INLINE_VISIBILITY
void wait() const {__state_->wait();}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{return __state_->wait_for(__rel_time);}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{return __state_->wait_until(__abs_time);}
};
template <class _Rp>
future<_Rp>::future(__assoc_state<_Rp>* __state)
: __state_(__state)
{
__state_->__attach_future();
}
struct __release_shared_count
{
void operator()(__shared_count* p) {p->__release_shared();}
};
template <class _Rp>
future<_Rp>::~future()
{
if (__state_)
__state_->__release_shared();
}
template <class _Rp>
_Rp
future<_Rp>::get()
{
unique_ptr<__shared_count, __release_shared_count> __(__state_);
__assoc_state<_Rp>* __s = __state_;
__state_ = nullptr;
return __s->move();
}
template <class _Rp>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FUTURE future<_Rp&>
{
__assoc_state<_Rp&>* __state_;
explicit future(__assoc_state<_Rp&>* __state);
template <class> friend class promise;
template <class> friend class shared_future;
template <class _R1, class _Fp>
friend future<_R1> __make_deferred_assoc_state(_Fp&& __f);
template <class _R1, class _Fp>
friend future<_R1> __make_async_assoc_state(_Fp&& __f);
public:
_LIBCPP_INLINE_VISIBILITY
future() _NOEXCEPT : __state_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
future(future&& __rhs) _NOEXCEPT
: __state_(__rhs.__state_) {__rhs.__state_ = nullptr;}
future(const future&) = delete;
future& operator=(const future&) = delete;
_LIBCPP_INLINE_VISIBILITY
future& operator=(future&& __rhs) _NOEXCEPT
{
future(_VSTD::move(__rhs)).swap(*this);
return *this;
}
~future();
_LIBCPP_INLINE_VISIBILITY
shared_future<_Rp&> share() _NOEXCEPT;
// retrieving the value
_Rp& get();
_LIBCPP_INLINE_VISIBILITY
void swap(future& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// functions to check state
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __state_ != nullptr;}
_LIBCPP_INLINE_VISIBILITY
void wait() const {__state_->wait();}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{return __state_->wait_for(__rel_time);}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{return __state_->wait_until(__abs_time);}
};
template <class _Rp>
future<_Rp&>::future(__assoc_state<_Rp&>* __state)
: __state_(__state)
{
__state_->__attach_future();
}
template <class _Rp>
future<_Rp&>::~future()
{
if (__state_)
__state_->__release_shared();
}
template <class _Rp>
_Rp&
future<_Rp&>::get()
{
unique_ptr<__shared_count, __release_shared_count> __(__state_);
__assoc_state<_Rp&>* __s = __state_;
__state_ = nullptr;
return __s->copy();
}
template <>
class _LIBCPP_TYPE_VIS _LIBCPP_AVAILABILITY_FUTURE future<void>
{
__assoc_sub_state* __state_;
explicit future(__assoc_sub_state* __state);
template <class> friend class promise;
template <class> friend class shared_future;
template <class _R1, class _Fp>
friend future<_R1> __make_deferred_assoc_state(_Fp&& __f);
template <class _R1, class _Fp>
friend future<_R1> __make_async_assoc_state(_Fp&& __f);
public:
_LIBCPP_INLINE_VISIBILITY
future() _NOEXCEPT : __state_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
future(future&& __rhs) _NOEXCEPT
: __state_(__rhs.__state_) {__rhs.__state_ = nullptr;}
future(const future&) = delete;
future& operator=(const future&) = delete;
_LIBCPP_INLINE_VISIBILITY
future& operator=(future&& __rhs) _NOEXCEPT
{
future(_VSTD::move(__rhs)).swap(*this);
return *this;
}
~future();
_LIBCPP_INLINE_VISIBILITY
shared_future<void> share() _NOEXCEPT;
// retrieving the value
void get();
_LIBCPP_INLINE_VISIBILITY
void swap(future& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// functions to check state
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __state_ != nullptr;}
_LIBCPP_INLINE_VISIBILITY
void wait() const {__state_->wait();}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{return __state_->wait_for(__rel_time);}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{return __state_->wait_until(__abs_time);}
};
template <class _Rp>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(future<_Rp>& __x, future<_Rp>& __y) _NOEXCEPT
{
__x.swap(__y);
}
// promise<R>
template <class _Callable> class packaged_task;
template <class _Rp>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FUTURE promise
{
__assoc_state<_Rp>* __state_;
_LIBCPP_INLINE_VISIBILITY
explicit promise(nullptr_t) _NOEXCEPT : __state_(nullptr) {}
template <class> friend class packaged_task;
public:
promise();
template <class _Alloc>
promise(allocator_arg_t, const _Alloc& __a);
_LIBCPP_INLINE_VISIBILITY
promise(promise&& __rhs) _NOEXCEPT
: __state_(__rhs.__state_) {__rhs.__state_ = nullptr;}
promise(const promise& __rhs) = delete;
~promise();
// assignment
_LIBCPP_INLINE_VISIBILITY
promise& operator=(promise&& __rhs) _NOEXCEPT
{
promise(_VSTD::move(__rhs)).swap(*this);
return *this;
}
promise& operator=(const promise& __rhs) = delete;
_LIBCPP_INLINE_VISIBILITY
void swap(promise& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// retrieving the result
future<_Rp> get_future();
// setting the result
void set_value(const _Rp& __r);
void set_value(_Rp&& __r);
void set_exception(exception_ptr __p);
// setting the result with deferred notification
void set_value_at_thread_exit(const _Rp& __r);
void set_value_at_thread_exit(_Rp&& __r);
void set_exception_at_thread_exit(exception_ptr __p);
};
template <class _Rp>
promise<_Rp>::promise()
: __state_(new __assoc_state<_Rp>)
{
}
template <class _Rp>
template <class _Alloc>
promise<_Rp>::promise(allocator_arg_t, const _Alloc& __a0)
{
typedef __assoc_state_alloc<_Rp, _Alloc> _State;
typedef typename __allocator_traits_rebind<_Alloc, _State>::type _A2;
typedef __allocator_destructor<_A2> _D2;
_A2 __a(__a0);
unique_ptr<_State, _D2> __hold(__a.allocate(1), _D2(__a, 1));
::new ((void*)_VSTD::addressof(*__hold.get())) _State(__a0);
__state_ = _VSTD::addressof(*__hold.release());
}
template <class _Rp>
promise<_Rp>::~promise()
{
if (__state_)
{
if (!__state_->__has_value() && __state_->use_count() > 1)
__state_->set_exception(make_exception_ptr(
future_error(make_error_code(future_errc::broken_promise))
));
__state_->__release_shared();
}
}
template <class _Rp>
future<_Rp>
promise<_Rp>::get_future()
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
return future<_Rp>(__state_);
}
template <class _Rp>
void
promise<_Rp>::set_value(const _Rp& __r)
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_value(__r);
}
template <class _Rp>
void
promise<_Rp>::set_value(_Rp&& __r)
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_value(_VSTD::move(__r));
}
template <class _Rp>
void
promise<_Rp>::set_exception(exception_ptr __p)
{
_LIBCPP_ASSERT( __p != nullptr, "promise::set_exception: received nullptr" );
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_exception(__p);
}
template <class _Rp>
void
promise<_Rp>::set_value_at_thread_exit(const _Rp& __r)
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_value_at_thread_exit(__r);
}
template <class _Rp>
void
promise<_Rp>::set_value_at_thread_exit(_Rp&& __r)
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_value_at_thread_exit(_VSTD::move(__r));
}
template <class _Rp>
void
promise<_Rp>::set_exception_at_thread_exit(exception_ptr __p)
{
_LIBCPP_ASSERT( __p != nullptr, "promise::set_exception_at_thread_exit: received nullptr" );
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_exception_at_thread_exit(__p);
}
// promise<R&>
template <class _Rp>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FUTURE promise<_Rp&>
{
__assoc_state<_Rp&>* __state_;
_LIBCPP_INLINE_VISIBILITY
explicit promise(nullptr_t) _NOEXCEPT : __state_(nullptr) {}
template <class> friend class packaged_task;
public:
promise();
template <class _Allocator>
promise(allocator_arg_t, const _Allocator& __a);
_LIBCPP_INLINE_VISIBILITY
promise(promise&& __rhs) _NOEXCEPT
: __state_(__rhs.__state_) {__rhs.__state_ = nullptr;}
promise(const promise& __rhs) = delete;
~promise();
// assignment
_LIBCPP_INLINE_VISIBILITY
promise& operator=(promise&& __rhs) _NOEXCEPT
{
promise(_VSTD::move(__rhs)).swap(*this);
return *this;
}
promise& operator=(const promise& __rhs) = delete;
_LIBCPP_INLINE_VISIBILITY
void swap(promise& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// retrieving the result
future<_Rp&> get_future();
// setting the result
void set_value(_Rp& __r);
void set_exception(exception_ptr __p);
// setting the result with deferred notification
void set_value_at_thread_exit(_Rp&);
void set_exception_at_thread_exit(exception_ptr __p);
};
template <class _Rp>
promise<_Rp&>::promise()
: __state_(new __assoc_state<_Rp&>)
{
}
template <class _Rp>
template <class _Alloc>
promise<_Rp&>::promise(allocator_arg_t, const _Alloc& __a0)
{
typedef __assoc_state_alloc<_Rp&, _Alloc> _State;
typedef typename __allocator_traits_rebind<_Alloc, _State>::type _A2;
typedef __allocator_destructor<_A2> _D2;
_A2 __a(__a0);
unique_ptr<_State, _D2> __hold(__a.allocate(1), _D2(__a, 1));
::new ((void*)_VSTD::addressof(*__hold.get())) _State(__a0);
__state_ = _VSTD::addressof(*__hold.release());
}
template <class _Rp>
promise<_Rp&>::~promise()
{
if (__state_)
{
if (!__state_->__has_value() && __state_->use_count() > 1)
__state_->set_exception(make_exception_ptr(
future_error(make_error_code(future_errc::broken_promise))
));
__state_->__release_shared();
}
}
template <class _Rp>
future<_Rp&>
promise<_Rp&>::get_future()
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
return future<_Rp&>(__state_);
}
template <class _Rp>
void
promise<_Rp&>::set_value(_Rp& __r)
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_value(__r);
}
template <class _Rp>
void
promise<_Rp&>::set_exception(exception_ptr __p)
{
_LIBCPP_ASSERT( __p != nullptr, "promise::set_exception: received nullptr" );
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_exception(__p);
}
template <class _Rp>
void
promise<_Rp&>::set_value_at_thread_exit(_Rp& __r)
{
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_value_at_thread_exit(__r);
}
template <class _Rp>
void
promise<_Rp&>::set_exception_at_thread_exit(exception_ptr __p)
{
_LIBCPP_ASSERT( __p != nullptr, "promise::set_exception_at_thread_exit: received nullptr" );
if (__state_ == nullptr)
__throw_future_error(future_errc::no_state);
__state_->set_exception_at_thread_exit(__p);
}
// promise<void>
template <>
class _LIBCPP_TYPE_VIS _LIBCPP_AVAILABILITY_FUTURE promise<void>
{
__assoc_sub_state* __state_;
_LIBCPP_INLINE_VISIBILITY
explicit promise(nullptr_t) _NOEXCEPT : __state_(nullptr) {}
template <class> friend class packaged_task;
public:
promise();
template <class _Allocator>
_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
promise(allocator_arg_t, const _Allocator& __a);
_LIBCPP_INLINE_VISIBILITY
promise(promise&& __rhs) _NOEXCEPT
: __state_(__rhs.__state_) {__rhs.__state_ = nullptr;}
promise(const promise& __rhs) = delete;
~promise();
// assignment
_LIBCPP_INLINE_VISIBILITY
promise& operator=(promise&& __rhs) _NOEXCEPT
{
promise(_VSTD::move(__rhs)).swap(*this);
return *this;
}
promise& operator=(const promise& __rhs) = delete;
_LIBCPP_INLINE_VISIBILITY
void swap(promise& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// 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 _Alloc>
promise<void>::promise(allocator_arg_t, const _Alloc& __a0)
{
typedef __assoc_sub_state_alloc<_Alloc> _State;
typedef typename __allocator_traits_rebind<_Alloc, _State>::type _A2;
typedef __allocator_destructor<_A2> _D2;
_A2 __a(__a0);
unique_ptr<_State, _D2> __hold(__a.allocate(1), _D2(__a, 1));
::new ((void*)_VSTD::addressof(*__hold.get())) _State(__a0);
__state_ = _VSTD::addressof(*__hold.release());
}
template <class _Rp>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(promise<_Rp>& __x, promise<_Rp>& __y) _NOEXCEPT
{
__x.swap(__y);
}
template <class _Rp, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator<promise<_Rp>, _Alloc>
: public true_type {};
// packaged_task
template<class _Fp> class __packaged_task_base;
template<class _Rp, class ..._ArgTypes>
class _LIBCPP_AVAILABILITY_FUTURE __packaged_task_base<_Rp(_ArgTypes...)>
{
__packaged_task_base(const __packaged_task_base&);
__packaged_task_base& operator=(const __packaged_task_base&);
public:
_LIBCPP_INLINE_VISIBILITY
__packaged_task_base() {}
_LIBCPP_INLINE_VISIBILITY
virtual ~__packaged_task_base() {}
virtual void __move_to(__packaged_task_base*) _NOEXCEPT = 0;
virtual void destroy() = 0;
virtual void destroy_deallocate() = 0;
virtual _Rp operator()(_ArgTypes&& ...) = 0;
};
template<class _FD, class _Alloc, class _FB> class __packaged_task_func;
template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
class _LIBCPP_AVAILABILITY_FUTURE __packaged_task_func<_Fp, _Alloc, _Rp(_ArgTypes...)>
: public __packaged_task_base<_Rp(_ArgTypes...)>
{
__compressed_pair<_Fp, _Alloc> __f_;
public:
_LIBCPP_INLINE_VISIBILITY
explicit __packaged_task_func(const _Fp& __f) : __f_(__f, __default_init_tag()) {}
_LIBCPP_INLINE_VISIBILITY
explicit __packaged_task_func(_Fp&& __f) : __f_(_VSTD::move(__f), __default_init_tag()) {}
_LIBCPP_INLINE_VISIBILITY
__packaged_task_func(const _Fp& __f, const _Alloc& __a)
: __f_(__f, __a) {}
_LIBCPP_INLINE_VISIBILITY
__packaged_task_func(_Fp&& __f, const _Alloc& __a)
: __f_(_VSTD::move(__f), __a) {}
virtual void __move_to(__packaged_task_base<_Rp(_ArgTypes...)>*) _NOEXCEPT;
virtual void destroy();
virtual void destroy_deallocate();
virtual _Rp operator()(_ArgTypes&& ... __args);
};
template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
void
__packaged_task_func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__move_to(
__packaged_task_base<_Rp(_ArgTypes...)>* __p) _NOEXCEPT
{
::new ((void*)__p) __packaged_task_func(_VSTD::move(__f_.first()), _VSTD::move(__f_.second()));
}
template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
void
__packaged_task_func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy()
{
__f_.~__compressed_pair<_Fp, _Alloc>();
}
template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
void
__packaged_task_func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy_deallocate()
{
typedef typename __allocator_traits_rebind<_Alloc, __packaged_task_func>::type _Ap;
typedef allocator_traits<_Ap> _ATraits;
typedef pointer_traits<typename _ATraits::pointer> _PTraits;
_Ap __a(__f_.second());
__f_.~__compressed_pair<_Fp, _Alloc>();
__a.deallocate(_PTraits::pointer_to(*this), 1);
}
template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
_Rp
__packaged_task_func<_Fp, _Alloc, _Rp(_ArgTypes...)>::operator()(_ArgTypes&& ... __arg)
{
return _VSTD::__invoke(__f_.first(), _VSTD::forward<_ArgTypes>(__arg)...);
}
template <class _Callable> class __packaged_task_function;
template<class _Rp, class ..._ArgTypes>
class _LIBCPP_AVAILABILITY_FUTURE __packaged_task_function<_Rp(_ArgTypes...)>
{
typedef __packaged_task_base<_Rp(_ArgTypes...)> __base;
_LIBCPP_INLINE_VISIBILITY _LIBCPP_NO_CFI
__base* __get_buf() { return (__base*)&__buf_; }
typename aligned_storage<3*sizeof(void*)>::type __buf_;
__base* __f_;
public:
typedef _Rp result_type;
// construct/copy/destroy:
_LIBCPP_INLINE_VISIBILITY
__packaged_task_function() _NOEXCEPT : __f_(nullptr) {}
template<class _Fp>
__packaged_task_function(_Fp&& __f);
template<class _Fp, class _Alloc>
__packaged_task_function(allocator_arg_t, const _Alloc& __a, _Fp&& __f);
__packaged_task_function(__packaged_task_function&&) _NOEXCEPT;
__packaged_task_function& operator=(__packaged_task_function&&) _NOEXCEPT;
__packaged_task_function(const __packaged_task_function&) = delete;
__packaged_task_function& operator=(const __packaged_task_function&) = delete;
~__packaged_task_function();
void swap(__packaged_task_function&) _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
_Rp operator()(_ArgTypes...) const;
};
template<class _Rp, class ..._ArgTypes>
__packaged_task_function<_Rp(_ArgTypes...)>::__packaged_task_function(__packaged_task_function&& __f) _NOEXCEPT
{
if (__f.__f_ == nullptr)
__f_ = nullptr;
else if (__f.__f_ == __f.__get_buf())
{
__f.__f_->__move_to(__get_buf());
__f_ = (__base*)&__buf_;
}
else
{
__f_ = __f.__f_;
__f.__f_ = nullptr;
}
}
template<class _Rp, class ..._ArgTypes>
template <class _Fp>
__packaged_task_function<_Rp(_ArgTypes...)>::__packaged_task_function(_Fp&& __f)
: __f_(nullptr)
{
typedef typename remove_reference<typename decay<_Fp>::type>::type _FR;
typedef __packaged_task_func<_FR, allocator<_FR>, _Rp(_ArgTypes...)> _FF;
if (sizeof(_FF) <= sizeof(__buf_))
{
::new ((void*)&__buf_) _FF(_VSTD::forward<_Fp>(__f));
__f_ = (__base*)&__buf_;
}
else
{
typedef allocator<_FF> _Ap;
_Ap __a;
typedef __allocator_destructor<_Ap> _Dp;
unique_ptr<__base, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
::new ((void*)__hold.get()) _FF(_VSTD::forward<_Fp>(__f), allocator<_FR>(__a));
__f_ = __hold.release();
}
}
template<class _Rp, class ..._ArgTypes>
template <class _Fp, class _Alloc>
__packaged_task_function<_Rp(_ArgTypes...)>::__packaged_task_function(
allocator_arg_t, const _Alloc& __a0, _Fp&& __f)
: __f_(nullptr)
{
typedef typename remove_reference<typename decay<_Fp>::type>::type _FR;
typedef __packaged_task_func<_FR, _Alloc, _Rp(_ArgTypes...)> _FF;
if (sizeof(_FF) <= sizeof(__buf_))
{
__f_ = (__base*)&__buf_;
::new ((void*)__f_) _FF(_VSTD::forward<_Fp>(__f));
}
else
{
typedef typename __allocator_traits_rebind<_Alloc, _FF>::type _Ap;
_Ap __a(__a0);
typedef __allocator_destructor<_Ap> _Dp;
unique_ptr<__base, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
::new ((void*)_VSTD::addressof(*__hold.get()))
_FF(_VSTD::forward<_Fp>(__f), _Alloc(__a));
__f_ = _VSTD::addressof(*__hold.release());
}
}
template<class _Rp, class ..._ArgTypes>
__packaged_task_function<_Rp(_ArgTypes...)>&
__packaged_task_function<_Rp(_ArgTypes...)>::operator=(__packaged_task_function&& __f) _NOEXCEPT
{
if (__f_ == __get_buf())
__f_->destroy();
else if (__f_)
__f_->destroy_deallocate();
__f_ = nullptr;
if (__f.__f_ == nullptr)
__f_ = nullptr;
else if (__f.__f_ == __f.__get_buf())
{
__f.__f_->__move_to(__get_buf());
__f_ = __get_buf();
}
else
{
__f_ = __f.__f_;
__f.__f_ = nullptr;
}
return *this;
}
template<class _Rp, class ..._ArgTypes>
__packaged_task_function<_Rp(_ArgTypes...)>::~__packaged_task_function()
{
if (__f_ == __get_buf())
__f_->destroy();
else if (__f_)
__f_->destroy_deallocate();
}
template<class _Rp, class ..._ArgTypes>
_LIBCPP_NO_CFI
void
__packaged_task_function<_Rp(_ArgTypes...)>::swap(__packaged_task_function& __f) _NOEXCEPT
{
if (__f_ == (__base*)&__buf_ && __f.__f_ == (__base*)&__f.__buf_)
{
typename aligned_storage<sizeof(__buf_)>::type __tempbuf;
__base* __t = (__base*)&__tempbuf;
__f_->__move_to(__t);
__f_->destroy();
__f_ = nullptr;
__f.__f_->__move_to((__base*)&__buf_);
__f.__f_->destroy();
__f.__f_ = nullptr;
__f_ = (__base*)&__buf_;
__t->__move_to((__base*)&__f.__buf_);
__t->destroy();
__f.__f_ = (__base*)&__f.__buf_;
}
else if (__f_ == (__base*)&__buf_)
{
__f_->__move_to((__base*)&__f.__buf_);
__f_->destroy();
__f_ = __f.__f_;
__f.__f_ = (__base*)&__f.__buf_;
}
else if (__f.__f_ == (__base*)&__f.__buf_)
{
__f.__f_->__move_to((__base*)&__buf_);
__f.__f_->destroy();
__f.__f_ = __f_;
__f_ = (__base*)&__buf_;
}
else
_VSTD::swap(__f_, __f.__f_);
}
template<class _Rp, class ..._ArgTypes>
inline
_Rp
__packaged_task_function<_Rp(_ArgTypes...)>::operator()(_ArgTypes... __arg) const
{
return (*__f_)(_VSTD::forward<_ArgTypes>(__arg)...);
}
template<class _Rp, class ..._ArgTypes>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FUTURE packaged_task<_Rp(_ArgTypes...)>
{
public:
typedef _Rp result_type; // extension
private:
__packaged_task_function<result_type(_ArgTypes...)> __f_;
promise<result_type> __p_;
public:
// construction and destruction
_LIBCPP_INLINE_VISIBILITY
packaged_task() _NOEXCEPT : __p_(nullptr) {}
template <class _Fp,
class = typename enable_if
<
!is_same<
typename __uncvref<_Fp>::type,
packaged_task
>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY
explicit packaged_task(_Fp&& __f) : __f_(_VSTD::forward<_Fp>(__f)) {}
template <class _Fp, class _Allocator,
class = typename enable_if
<
!is_same<
typename __uncvref<_Fp>::type,
packaged_task
>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY
packaged_task(allocator_arg_t, const _Allocator& __a, _Fp&& __f)
: __f_(allocator_arg, __a, _VSTD::forward<_Fp>(__f)),
__p_(allocator_arg, __a) {}
// ~packaged_task() = default;
// no copy
packaged_task(const packaged_task&) = delete;
packaged_task& operator=(const packaged_task&) = delete;
// move support
_LIBCPP_INLINE_VISIBILITY
packaged_task(packaged_task&& __other) _NOEXCEPT
: __f_(_VSTD::move(__other.__f_)), __p_(_VSTD::move(__other.__p_)) {}
_LIBCPP_INLINE_VISIBILITY
packaged_task& operator=(packaged_task&& __other) _NOEXCEPT
{
__f_ = _VSTD::move(__other.__f_);
__p_ = _VSTD::move(__other.__p_);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
void swap(packaged_task& __other) _NOEXCEPT
{
__f_.swap(__other.__f_);
__p_.swap(__other.__p_);
}
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __p_.__state_ != nullptr;}
// result retrieval
_LIBCPP_INLINE_VISIBILITY
future<result_type> get_future() {return __p_.get_future();}
// execution
void operator()(_ArgTypes... __args);
void make_ready_at_thread_exit(_ArgTypes... __args);
void reset();
};
template<class _Rp, class ..._ArgTypes>
void
packaged_task<_Rp(_ArgTypes...)>::operator()(_ArgTypes... __args)
{
if (__p_.__state_ == nullptr)
__throw_future_error(future_errc::no_state);
if (__p_.__state_->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
__p_.set_value(__f_(_VSTD::forward<_ArgTypes>(__args)...));
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
__p_.set_exception(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template<class _Rp, class ..._ArgTypes>
void
packaged_task<_Rp(_ArgTypes...)>::make_ready_at_thread_exit(_ArgTypes... __args)
{
if (__p_.__state_ == nullptr)
__throw_future_error(future_errc::no_state);
if (__p_.__state_->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
__p_.set_value_at_thread_exit(__f_(_VSTD::forward<_ArgTypes>(__args)...));
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
__p_.set_exception_at_thread_exit(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template<class _Rp, class ..._ArgTypes>
void
packaged_task<_Rp(_ArgTypes...)>::reset()
{
if (!valid())
__throw_future_error(future_errc::no_state);
__p_ = promise<result_type>();
}
template<class ..._ArgTypes>
class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FUTURE packaged_task<void(_ArgTypes...)>
{
public:
typedef void result_type; // extension
private:
__packaged_task_function<result_type(_ArgTypes...)> __f_;
promise<result_type> __p_;
public:
// construction and destruction
_LIBCPP_INLINE_VISIBILITY
packaged_task() _NOEXCEPT : __p_(nullptr) {}
template <class _Fp,
class = typename enable_if
<
!is_same<
typename __uncvref<_Fp>::type,
packaged_task
>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY
explicit packaged_task(_Fp&& __f) : __f_(_VSTD::forward<_Fp>(__f)) {}
template <class _Fp, class _Allocator,
class = typename enable_if
<
!is_same<
typename __uncvref<_Fp>::type,
packaged_task
>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY
packaged_task(allocator_arg_t, const _Allocator& __a, _Fp&& __f)
: __f_(allocator_arg, __a, _VSTD::forward<_Fp>(__f)),
__p_(allocator_arg, __a) {}
// ~packaged_task() = default;
// no copy
packaged_task(const packaged_task&) = delete;
packaged_task& operator=(const packaged_task&) = delete;
// move support
_LIBCPP_INLINE_VISIBILITY
packaged_task(packaged_task&& __other) _NOEXCEPT
: __f_(_VSTD::move(__other.__f_)), __p_(_VSTD::move(__other.__p_)) {}
_LIBCPP_INLINE_VISIBILITY
packaged_task& operator=(packaged_task&& __other) _NOEXCEPT
{
__f_ = _VSTD::move(__other.__f_);
__p_ = _VSTD::move(__other.__p_);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
void swap(packaged_task& __other) _NOEXCEPT
{
__f_.swap(__other.__f_);
__p_.swap(__other.__p_);
}
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __p_.__state_ != nullptr;}
// result retrieval
_LIBCPP_INLINE_VISIBILITY
future<result_type> get_future() {return __p_.get_future();}
// execution
void operator()(_ArgTypes... __args);
void make_ready_at_thread_exit(_ArgTypes... __args);
void reset();
};
template<class ..._ArgTypes>
void
packaged_task<void(_ArgTypes...)>::operator()(_ArgTypes... __args)
{
if (__p_.__state_ == nullptr)
__throw_future_error(future_errc::no_state);
if (__p_.__state_->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
__f_(_VSTD::forward<_ArgTypes>(__args)...);
__p_.set_value();
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
__p_.set_exception(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template<class ..._ArgTypes>
void
packaged_task<void(_ArgTypes...)>::make_ready_at_thread_exit(_ArgTypes... __args)
{
if (__p_.__state_ == nullptr)
__throw_future_error(future_errc::no_state);
if (__p_.__state_->__has_value())
__throw_future_error(future_errc::promise_already_satisfied);
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif // _LIBCPP_NO_EXCEPTIONS
__f_(_VSTD::forward<_ArgTypes>(__args)...);
__p_.set_value_at_thread_exit();
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch (...)
{
__p_.set_exception_at_thread_exit(current_exception());
}
#endif // _LIBCPP_NO_EXCEPTIONS
}
template<class ..._ArgTypes>
void
packaged_task<void(_ArgTypes...)>::reset()
{
if (!valid())
__throw_future_error(future_errc::no_state);
__p_ = promise<result_type>();
}
template <class _Rp, class... _ArgTypes>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(packaged_task<_Rp(_ArgTypes...)>& __x, packaged_task<_Rp(_ArgTypes...)>& __y) _NOEXCEPT
{
__x.swap(__y);
}
template <class _Callable, class _Alloc>
struct _LIBCPP_TEMPLATE_VIS uses_allocator<packaged_task<_Callable>, _Alloc>
: public true_type {};
template <class _Rp, class _Fp>
_LIBCPP_INLINE_VISIBILITY future<_Rp>
__make_deferred_assoc_state(_Fp&& __f)
{
unique_ptr<__deferred_assoc_state<_Rp, _Fp>, __release_shared_count>
__h(new __deferred_assoc_state<_Rp, _Fp>(_VSTD::forward<_Fp>(__f)));
return future<_Rp>(__h.get());
}
template <class _Rp, class _Fp>
_LIBCPP_INLINE_VISIBILITY future<_Rp>
__make_async_assoc_state(_Fp&& __f)
{
unique_ptr<__async_assoc_state<_Rp, _Fp>, __release_shared_count>
__h(new __async_assoc_state<_Rp, _Fp>(_VSTD::forward<_Fp>(__f)));
_VSTD::thread(&__async_assoc_state<_Rp, _Fp>::__execute, __h.get()).detach();
return future<_Rp>(__h.get());
}
#ifndef _LIBCPP_CXX03_LANG
template <class _Fp, class... _Args>
class _LIBCPP_HIDDEN __async_func
{
tuple<_Fp, _Args...> __f_;
public:
typedef typename __invoke_of<_Fp, _Args...>::type _Rp;
_LIBCPP_INLINE_VISIBILITY
explicit __async_func(_Fp&& __f, _Args&&... __args)
: __f_(_VSTD::move(__f), _VSTD::move(__args)...) {}
_LIBCPP_INLINE_VISIBILITY
__async_func(__async_func&& __f) : __f_(_VSTD::move(__f.__f_)) {}
_Rp operator()()
{
typedef typename __make_tuple_indices<1+sizeof...(_Args), 1>::type _Index;
return __execute(_Index());
}
private:
template <size_t ..._Indices>
_Rp
__execute(__tuple_indices<_Indices...>)
{
return _VSTD::__invoke(_VSTD::move(_VSTD::get<0>(__f_)), _VSTD::move(_VSTD::get<_Indices>(__f_))...);
}
};
inline _LIBCPP_INLINE_VISIBILITY bool __does_policy_contain(launch __policy, launch __value )
{ return (int(__policy) & int(__value)) != 0; }
template <class _Fp, class... _Args>
_LIBCPP_NODISCARD_AFTER_CXX17
future<typename __invoke_of<typename decay<_Fp>::type, typename decay<_Args>::type...>::type>
async(launch __policy, _Fp&& __f, _Args&&... __args)
{
typedef __async_func<typename decay<_Fp>::type, typename decay<_Args>::type...> _BF;
typedef typename _BF::_Rp _Rp;
#ifndef _LIBCPP_NO_EXCEPTIONS
try
{
#endif
if (__does_policy_contain(__policy, launch::async))
return _VSTD::__make_async_assoc_state<_Rp>(_BF(_VSTD::__decay_copy(_VSTD::forward<_Fp>(__f)),
_VSTD::__decay_copy(_VSTD::forward<_Args>(__args))...));
#ifndef _LIBCPP_NO_EXCEPTIONS
}
catch ( ... ) { if (__policy == launch::async) throw ; }
#endif
if (__does_policy_contain(__policy, launch::deferred))
return _VSTD::__make_deferred_assoc_state<_Rp>(_BF(_VSTD::__decay_copy(_VSTD::forward<_Fp>(__f)),
_VSTD::__decay_copy(_VSTD::forward<_Args>(__args))...));
return future<_Rp>{};
}
template <class _Fp, class... _Args>
_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY
future<typename __invoke_of<typename decay<_Fp>::type, typename decay<_Args>::type...>::type>
async(_Fp&& __f, _Args&&... __args)
{
return _VSTD::async(launch::any, _VSTD::forward<_Fp>(__f),
_VSTD::forward<_Args>(__args)...);
}
#endif // C++03
// shared_future
template <class _Rp>
class _LIBCPP_TEMPLATE_VIS shared_future
{
__assoc_state<_Rp>* __state_;
public:
_LIBCPP_INLINE_VISIBILITY
shared_future() _NOEXCEPT : __state_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
shared_future(const shared_future& __rhs) _NOEXCEPT : __state_(__rhs.__state_)
{if (__state_) __state_->__add_shared();}
_LIBCPP_INLINE_VISIBILITY
shared_future(future<_Rp>&& __f) _NOEXCEPT : __state_(__f.__state_)
{__f.__state_ = nullptr;}
_LIBCPP_INLINE_VISIBILITY
shared_future(shared_future&& __rhs) _NOEXCEPT : __state_(__rhs.__state_)
{__rhs.__state_ = nullptr;}
~shared_future();
shared_future& operator=(const shared_future& __rhs) _NOEXCEPT;
_LIBCPP_INLINE_VISIBILITY
shared_future& operator=(shared_future&& __rhs) _NOEXCEPT
{
shared_future(_VSTD::move(__rhs)).swap(*this);
return *this;
}
// retrieving the value
_LIBCPP_INLINE_VISIBILITY
const _Rp& get() const {return __state_->copy();}
_LIBCPP_INLINE_VISIBILITY
void swap(shared_future& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// functions to check state
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __state_ != nullptr;}
_LIBCPP_INLINE_VISIBILITY
void wait() const {__state_->wait();}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{return __state_->wait_for(__rel_time);}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{return __state_->wait_until(__abs_time);}
};
template <class _Rp>
shared_future<_Rp>::~shared_future()
{
if (__state_)
__state_->__release_shared();
}
template <class _Rp>
shared_future<_Rp>&
shared_future<_Rp>::operator=(const shared_future& __rhs) _NOEXCEPT
{
if (__rhs.__state_)
__rhs.__state_->__add_shared();
if (__state_)
__state_->__release_shared();
__state_ = __rhs.__state_;
return *this;
}
template <class _Rp>
class _LIBCPP_TEMPLATE_VIS shared_future<_Rp&>
{
__assoc_state<_Rp&>* __state_;
public:
_LIBCPP_INLINE_VISIBILITY
shared_future() _NOEXCEPT : __state_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
shared_future(const shared_future& __rhs) : __state_(__rhs.__state_)
{if (__state_) __state_->__add_shared();}
_LIBCPP_INLINE_VISIBILITY
shared_future(future<_Rp&>&& __f) _NOEXCEPT : __state_(__f.__state_)
{__f.__state_ = nullptr;}
_LIBCPP_INLINE_VISIBILITY
shared_future(shared_future&& __rhs) _NOEXCEPT : __state_(__rhs.__state_)
{__rhs.__state_ = nullptr;}
~shared_future();
shared_future& operator=(const shared_future& __rhs);
_LIBCPP_INLINE_VISIBILITY
shared_future& operator=(shared_future&& __rhs) _NOEXCEPT
{
shared_future(_VSTD::move(__rhs)).swap(*this);
return *this;
}
// retrieving the value
_LIBCPP_INLINE_VISIBILITY
_Rp& get() const {return __state_->copy();}
_LIBCPP_INLINE_VISIBILITY
void swap(shared_future& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// functions to check state
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __state_ != nullptr;}
_LIBCPP_INLINE_VISIBILITY
void wait() const {__state_->wait();}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{return __state_->wait_for(__rel_time);}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{return __state_->wait_until(__abs_time);}
};
template <class _Rp>
shared_future<_Rp&>::~shared_future()
{
if (__state_)
__state_->__release_shared();
}
template <class _Rp>
shared_future<_Rp&>&
shared_future<_Rp&>::operator=(const shared_future& __rhs)
{
if (__rhs.__state_)
__rhs.__state_->__add_shared();
if (__state_)
__state_->__release_shared();
__state_ = __rhs.__state_;
return *this;
}
template <>
class _LIBCPP_TYPE_VIS _LIBCPP_AVAILABILITY_FUTURE shared_future<void>
{
__assoc_sub_state* __state_;
public:
_LIBCPP_INLINE_VISIBILITY
shared_future() _NOEXCEPT : __state_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
shared_future(const shared_future& __rhs) : __state_(__rhs.__state_)
{if (__state_) __state_->__add_shared();}
_LIBCPP_INLINE_VISIBILITY
shared_future(future<void>&& __f) _NOEXCEPT : __state_(__f.__state_)
{__f.__state_ = nullptr;}
_LIBCPP_INLINE_VISIBILITY
shared_future(shared_future&& __rhs) _NOEXCEPT : __state_(__rhs.__state_)
{__rhs.__state_ = nullptr;}
~shared_future();
shared_future& operator=(const shared_future& __rhs);
_LIBCPP_INLINE_VISIBILITY
shared_future& operator=(shared_future&& __rhs) _NOEXCEPT
{
shared_future(_VSTD::move(__rhs)).swap(*this);
return *this;
}
// retrieving the value
_LIBCPP_INLINE_VISIBILITY
void get() const {__state_->copy();}
_LIBCPP_INLINE_VISIBILITY
void swap(shared_future& __rhs) _NOEXCEPT {_VSTD::swap(__state_, __rhs.__state_);}
// functions to check state
_LIBCPP_INLINE_VISIBILITY
bool valid() const _NOEXCEPT {return __state_ != nullptr;}
_LIBCPP_INLINE_VISIBILITY
void wait() const {__state_->wait();}
template <class _Rep, class _Period>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_for(const chrono::duration<_Rep, _Period>& __rel_time) const
{return __state_->wait_for(__rel_time);}
template <class _Clock, class _Duration>
_LIBCPP_INLINE_VISIBILITY
future_status
wait_until(const chrono::time_point<_Clock, _Duration>& __abs_time) const
{return __state_->wait_until(__abs_time);}
};
template <class _Rp>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(shared_future<_Rp>& __x, shared_future<_Rp>& __y) _NOEXCEPT
{
__x.swap(__y);
}
template <class _Rp>
inline
shared_future<_Rp>
future<_Rp>::share() _NOEXCEPT
{
return shared_future<_Rp>(_VSTD::move(*this));
}
template <class _Rp>
inline
shared_future<_Rp&>
future<_Rp&>::share() _NOEXCEPT
{
return shared_future<_Rp&>(_VSTD::move(*this));
}
inline
shared_future<void>
future<void>::share() _NOEXCEPT
{
return shared_future<void>(_VSTD::move(*this));
}
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS
#endif // _LIBCPP_FUTURE