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    std::packaged_task

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    <metanoindex/>

     
    C++
     
    Bibliothèque de support fil
    Threads
    Original:
    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
    Original:
    Mutual exclusion
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    mutex (C++11)
    timed_mutex (C++11)
    Gestion du verrouillage générique
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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 résultat
    Original:
    Getting the result
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    packaged_task::get_future
    Exécution
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    Execution
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    packaged_task::operator()
    packaged_task::make_ready_at_thread_exit
    packaged_task::reset
     
    <tbody> </tbody>
    Déclaré dans l'en-tête <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 modèle 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 être appelée de façon asynchrone, et sa valeur de retour ou exception levée est stockée dans l'état partagé, qui peut être consultée 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 stockées peuvent être allouées sur le tas ou avec un allocateur fournie .
    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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    Fonctions membres
    construit l'objet de la tâche
    Original:
    constructs the task object
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    (fonction membre publique) [edit]
    Détruit l'objet de la tâche
    Original:
    destructs the task object
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    (fonction membre publique) [edit]
    déplace l'objet tâche
    Original:
    moves the task object
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    (fonction membre publique) [edit]
    vérifie si l'objet de la tâche a une fonction valide
    Original:
    checks if the task object has a valid function
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    (fonction membre publique) [edit]
    swaps de deux objets de tâche
    Original:
    swaps two task objects
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    (fonction membre publique) [edit]
    Obtenir le résultat
    Original:
    Getting the result
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    renvoie une std::future associé au résultat promis
    Original:
    returns a std::future associated with the promised result
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    (fonction membre publique) [edit]
    Exécution
    Original:
    Execution
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    exécute la fonction
    Original:
    executes the function
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    (fonction membre publique) [edit]
    exécute la fonction de faire en sorte que le résultat est prêt 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]
    réinitialise l'état des résultats enregistrés l'abandon des exécutions précédentes
    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 spécialisé std::swap
    Original:
    specializes the std::swap algorithm
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    (fonction générique) [edit]

    Classes d'aide

    (C++11)
    se spécialise le trait de type std::uses_allocator
    Original:
    specializes the std::uses_allocator type trait
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    (classe générique spécialisée) [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';
}

    Résultat : 

    Waiting...Done!
Result is 7

    Voir aussi

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