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std::packaged_task

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Biblioteca de suporte a discussão
Threads
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Threads
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thread(C++11)
this_thread namespace
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this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Exclusão mútua
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Gestão de bloqueio genérico
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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)
Variáveis ​​de condição
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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)
Futuros
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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
Funções de membro
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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
Obtendo o resultado
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Getting the result
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packaged_task::get_future
Execução
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Execution
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packaged_task::operator()
packaged_task::make_ready_at_thread_exit
packaged_task::reset
 
Defined in header <future>
template< class > class packaged_task; //not defined
(1) (a partir do C++ 11)
template< class R, class Args... >
class packaged_task<R(Args...)>;
(2) (a partir do C++ 11)
O modelo std::packaged_task classe envolve qualquer alvo exigível (função, lambda expressão, expressão bind, ou outro objeto de função), de modo que ele pode ser chamado de forma assíncrona, e seu valor de retorno ou exceção lançada é armazenado no estado compartilhado, que pode ser acessado através std::future objetos.
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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Assim como std::function, std::packaged_task é um polimórfico, recipiente alocador-ciente: o alvo armazenados exigível pode ser atribuído, pilha ou com um alocador desde.
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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Índice

[editar] Funções de membro

constrói o objeto de tarefa
Original:
constructs the task object
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(função pública membro) [edit]
destrói o objeto de tarefa
Original:
destructs the task object
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(função pública membro) [edit]
move o objeto de tarefa
Original:
moves the task object
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(função pública membro) [edit]
Verifica se o objeto tarefa tem uma função válida
Original:
checks if the task object has a valid function
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(função pública membro) [edit]
troca dois objetos de tarefas
Original:
swaps two task objects
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(função pública membro) [edit]
Obtendo o resultado
Original:
Getting the result
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retorna um std::future associado ao resultado prometido
Original:
returns a std::future associated with the promised result
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(função pública membro) [edit]
Execução
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Execution
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executa a função
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executes the function
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(função pública membro) [edit]
executa a função de garantir que o resultado é preparada uma única vez a thread corrente
Original:
executes the function ensuring that the result is ready only once the current thread exits
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(função pública membro) [edit]
redefine o estado abandonar quaisquer resultados armazenados de execuções anteriores
Original:
resets the state abandoning any stored results of previous executions
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(função pública membro) [edit]

[editar] Não-membros funções

o algoritmo especializado std::swap
Original:
specializes the std::swap algorithm
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(modelo de função) [edit]

[editar] Classes auxiliares

especializa o traço tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(especialização modelo. classe) [edit]

[editar] Exemplo

#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';
}

Output:

Waiting...Done!
Result is 7

[editar] Veja também

(C++11)
espera por um valor que é definido de forma assíncrona
Original:
waits for a value that is set asynchronously
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(modelo de classe) [edit]