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    std::packaged_task

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    <metanoindex/>

     
    C++
     
    Bibliothque de support fil
    Threads
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    Threads
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    thread (C++11)
    this_thread espace de noms
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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)
    L'exclusion mutuelle
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    Mutual exclusion
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    mutex (C++11)
    timed_mutex (C++11)
    Gestion du verrouillage gnrique
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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)
    Les variables de condition
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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
    Les fonctions membres
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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
    Obtenir le rsultat
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    Getting the result
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    packaged_task::get_future
    Excution
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    Execution
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    packaged_task::operator()
    packaged_task::make_ready_at_thread_exit
    packaged_task::reset
     
    <tbody> </tbody>
    Dclar dans l'en-tte <future>
    template< class > class packaged_task; //not defined
    		 (1) (depuis C++11)
    template< class R, class Args... > class packaged_task<R(Args...)>;
    		 (2) (depuis C++11)
    Le modle std::packaged_task classe encapsule une cible appelable (fonction, expression lambda, l'expression de liaison, ou un autre objet de fonction) de sorte qu'il peut tre appele de faon asynchrone, et sa valeur de retour ou exception leve est stocke dans l'tat partag, qui peut tre consulte par le biais std::future objets .
    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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    Tout comme std::function, std::packaged_task est un polymorphe, allocateur-aware conteneur: la cible appelable stockes peuvent tre alloues sur le tas ou avec un allocateur fournie .
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    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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    Fonctions membres
    construit l'objet de la tche
    Original:
    constructs the task object
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    (fonction membre publique) [edit]
    Dtruit l'objet de la tche
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    destructs the task object
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    (fonction membre publique) [edit]
    dplace l'objet tche
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    moves the task object
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    (fonction membre publique) [edit]
    vrifie si l'objet de la tche a une fonction valide
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    checks if the task object has a valid function
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    (fonction membre publique) [edit]
    swaps de deux objets de tche
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    swaps two task objects
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    (fonction membre publique) [edit]
    Obtenir le rsultat
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    Getting the result
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    renvoie une std::future associ au rsultat promis
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    returns a std::future associated with the promised result
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    (fonction membre publique) [edit]
    Excution
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    Execution
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    excute la fonction
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    executes the function
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    (fonction membre publique) [edit]
    excute la fonction de faire en sorte que le rsultat est prt une fois que le thread courant
    Original:
    executes the function ensuring that the result is ready only once the current thread exits
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    (fonction membre publique) [edit]
    rinitialise l'tat des rsultats enregistrs l'abandon des excutions prcdentes
    Original:
    resets the state abandoning any stored results of previous executions
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    (fonction membre publique) [edit]

    Fonctions annexes

    (C++11)
    l'algorithme spcialis std::swap
    Original:
    specializes the std::swap algorithm
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    (fonction gnrique) [edit]

    Classes d'aide

    (C++11)
    se spcialise le trait de type std::uses_allocator
    Original:
    specializes the std::uses_allocator type trait
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    (classe gnrique spcialise) [edit]

    Exemple

    #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';
}

    Rsultat : 

    Waiting...Done!
Result is 7

    Voir aussi

    (C++11)
    attend une valeur qui est dfinie de manire asynchrone
    Original:
    waits for a value that is set asynchronously
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    (classe gnrique) [edit]
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