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/* Copyright (C) 2015 Povilas Kanapickas <povilas@radix.lt>
This file is part of cppreference-doc
This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
Unported License. To view a copy of this license, visit
http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative
Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
*/
#ifndef CPPREFERENCE_FUTURE_H
#define CPPREFERENCE_FUTURE_H
#if CPPREFERENCE_STDVER>= 2011
#include <chrono>
#include <memory> // for allocator_arg_t
#include <stdexcept>
#include <system_error> // for error_code
namespace std {
template<class T>
class future;
template<class T>
class shared_future;
enum class future_status;
template<class R>
class promise { // SIMPLIFIED: removed R& and void specializations
public:
promise();
template<class Alloc>
promise(std::allocator_arg_t, const Alloc& alloc);
promise(promise&& other);
promise(const promise& other) = delete;
~promise();
promise& operator=(promise&& other);
promise& operator=(const promise& rhs) = delete;
void swap(promise& other);
future<R> get_future();
void set_value(const R& value);
void set_value(R&& value);
void set_value(R& value); // member of R& specialization
void set_value(); // member of void specialization
void set_value_at_thread_exit(const R& value);
void set_value_at_thread_exit(R&& value);
void set_value_at_thread_exit(R& value); // member of R& specialization
void set_value_at_thread_exit(); // member of void specialization
void set_exception(std::exception_ptr p);
void set_exception_at_thread_exit(std::exception_ptr p);
};
template<class R>
void swap(promise<R>& lhs, promise<R>& rhs);
template<class R, class... Args>
class packaged_task;
template<class R, class ...ArgTypes>
class packaged_task<R(ArgTypes...)> {
public:
packaged_task();
template <class F>
explicit packaged_task(F&& f);
template <class F, class Allocator>
explicit packaged_task(std::allocator_arg_t, const Allocator& a, F&& f);
packaged_task(const packaged_task&) = delete;
packaged_task(packaged_task&& rhs);
~packaged_task();
packaged_task& operator=(const packaged_task&) = delete;
packaged_task& operator=(packaged_task&& rhs);
bool valid() const;
void swap(packaged_task& other);
std::future<R> get_future();
void operator()(ArgTypes... args);
void make_ready_at_thread_exit(ArgTypes... args);
void reset();
};
template<class Function, class... Args>
void swap(packaged_task<Function(Args...)>& lhs,
packaged_task<Function(Args...)>& rhs);
template<class T>
class future { // SIMPLIFIED: removed T& and void specializations
public:
future();
future(future&& other);
future(const future& other) = delete;
~future();
future& operator=(future&& other);
future& operator=(const future& other) = delete;
std::shared_future<T> share();
T get(); // member only of generic specialization
// T& get(); // member only of T& specialization
// void get(); // member only of void specialization
bool valid() const;
void wait() const;
template<class Rep, class Period>
std::future_status wait_for(const std::chrono::duration<Rep, Period>& timeout_duration) const;
template<class Clock, class Duration>
std::future_status wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time) const;
};
template<class T>
class shared_future { // SIMPLIFIED: removed T& and void specializations
public:
shared_future();
shared_future(const shared_future& other);
shared_future(std::future<T>&& other);
shared_future(shared_future&& other);
~shared_future();
shared_future& operator=(const shared_future& other);
shared_future& operator=(shared_future&& other);
T get(); // member only of generic specialization
// T& get(); // member only of T& specialization
// void get(); // member only of void specialization
bool valid() const;
void wait() const;
template<class Rep, class Period>
std::future_status wait_for(const std::chrono::duration<Rep, Period>& timeout_duration) const;
template<class Clock, class Duration>
std::future_status wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time) const;
};
enum class launch {
async,
deferred
};
enum class future_status {
ready,
timeout,
deferred
};
enum class future_errc {
broken_promise,
future_already_retrieved,
promise_already_satisfied,
no_state
};
class future_error : public logic_error {
public:
future_error(std::error_code ec);
const std::error_code& code() const;
};
#if CPPREFERENCE_STDVER >= 2020
template<class Function, class... Args>
[[nodiscard]]
std::future<typename std::invoke_result_t<Function, Args...>>
async(Function&& f, Args&& ... args);
template<class Function, class... Args>
[[nodiscard]]
std::future<typename std::invoke_result_t<Function, Args...>>
async(std::launch policy, Function&& f, Args&& ... args);
#elif CPPREFERENCE_STDVER >= 2017
template<class Function, class... Args>
std::future<typename std::invoke_result_t<Function, Args...>>
async(Function&& f, Args&& ... args);
template<class Function, class... Args>
std::future<typename std::invoke_result_t<Function, Args...>>
async(std::launch policy, Function&& f, Args&& ... args);
#else
template<class Function, class... Args>
std::future<typename std::result_of<Function(Args...)>::type>
async(Function&& f, Args&& ... args);
template<class Function, class... Args>
std::future<typename std::result_of<Function(Args...)>::type>
async(std::launch policy, Function&& f, Args&& ... args);
#endif
const std::error_category& future_category();
} // namespace std
#endif // CPPREFERENCE_STDVER>= 2011
#endif // CPPREFERENCE_FUTURE_H