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std::packaged_task

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C++
 
Библиотека поддержки потоков
Потоки
Original:
Threads
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thread(C++11)
this_thread имен
Original:
this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Взаимное исключение
Original:
Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generic управления замком
Original:
Generic lock management
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lock_guard(C++11)
unique_lock(C++11)
defer_lock_t
try_to_lock_t
adopt_lock_t		(C++11)
(C++11)
(C++11)
lock(C++11)
try_lock(C++11)
defer_lock
try_to_lock
adopt_lock		(C++11)
(C++11)
(C++11)
Условия переменных
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Condition variables
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condition_variable(C++11)
condition_variable_any(C++11)
notify_all_at_thread_exit(C++11)
cv_status(C++11)
Futures
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Futures
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promise(C++11)
future(C++11)
shared_future(C++11)
packaged_task(C++11)
async(C++11)
launch(C++11)
future_status(C++11)
future_error(C++11)
future_category(C++11)
future_errc(C++11)
 
std::packaged_task
Член функций
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Member functions
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packaged_task::packaged_task
packaged_task::~packaged_task
packaged_task::operator=
packaged_task::valid
packaged_task::swap
Получение результата
Original:
Getting the result
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packaged_task::get_future
Выполнение
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Execution
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packaged_task::operator()
packaged_task::make_ready_at_thread_exit
packaged_task::reset
 
Заголовочный файл <future>
template< class > class packaged_task; //not defined
 (1) (начиная с C++11)
template< class R, class Args... >
class packaged_task<R(Args...)>;
 (2) (начиная с C++11)
std::packaged_task шаблон класса обертывания любой вызываемый цели (функции, лямбда-выражения, связывают выражение или другой функции объекта), так что он может быть вызван асинхронно, и его значение возврата или исключение хранятся в общей государства, которые могут быть доступны через std::future Объекты.
Original:
The class template std::packaged_task wraps any callable target (function, lambda expression, bind expression, or another function object) so that it can be invoked asynchronously, and its return value or exception thrown is stored in the shared state, which can be accessed through std::future objects.
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Так же, как std::function, std::packaged_task является полиморфным, распределитель-Aware контейнера: хранить вызываемые цели может быть выделено на куче или с предоставлена ​​распределитель.
Original:
Just like std::function, std::packaged_task is a polymorphic, allocator-aware container: the stored callable target may be allocated on heap or with a provided allocator.
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Содержание

[править] Член функций
строит объект задачи
Original:
constructs the task object
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(public функция-член) [edit]
разрушает объект задачи
Original:
destructs the task object
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(public функция-член) [edit]
перемещает объект задачи
Original:
moves the task object
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(public функция-член) [edit]
проверяет, является ли объект задачи имеет действительную функцию
Original:
checks if the task object has a valid function
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(public функция-член) [edit]
свопы двух объектов задачу
Original:
swaps two task objects
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(public функция-член) [edit]
Получение результата
Original:
Getting the result
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возвращает std::future связанные с обещанный результат
Original:
returns a std::future associated with the promised result
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(public функция-член) [edit]
Выполнение
Original:
Execution
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выполняет функцию
Original:
executes the function
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(public функция-член) [edit]
выполняет функцию обеспечения того, чтобы результат готов только один раз текущий поток существует
Original:
executes the function ensuring that the result is ready only once the current thread exits
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(public функция-член) [edit]
Сбрасывает состояние отказа от любых хранятся результаты предыдущих казней
Original:
resets the state abandoning any stored results of previous executions
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(public функция-член) [edit]

[править] Не являющиеся членами функций

(C++11)
Специализируется std::swap алгоритм
Original:
specializes the std::swap algorithm
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(шаблон функции) [edit]

[править] Вспомогательные классы

(C++11)
Специализируется черта std::uses_allocator типа
Original:
specializes the std::uses_allocator type trait
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(специализация шаблона класса) [edit]

[править] Пример

#include <iostream>
#include <future>
#include <thread>
 
int main()
{
    std::packaged_task<int()> task([](){return 7;}); // wrap the function
    std::future<int> result = task.get_future();  // get a future
    std::thread(std::move(task)).detach(); // launch on a thread
    std::cout << "Waiting...";
    result.wait();
    std::cout << "Done!\nResult is " << result.get() << '\n';
}

Вывод: 

Waiting...Done!
Result is 7

[править] См. также

(C++11)
ожидает значение, которое устанавливается в асинхронном режиме
Original:
waits for a value that is set asynchronously
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(шаблон класса) [edit]
Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/thread/packaged_task&oldid=29292»