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std::future

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Bibliothèque de support fil
Threads
Original:
Threads
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thread (C++11)
this_thread espace de noms
Original:
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
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)
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::future
future::future
future::~future
future::operator=
future::share
Obtenir le résultat
Original:
Getting the result
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future::get
État
Original:
State
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future::valid
future::wait
future::wait_for
future::wait_until
 
Defined in header <future>
template< class T > class future;
(1) (depuis C++11)
template< class T > class future<T&>;
(2) (depuis C++11)
template<>          class future<void>;
(3) (depuis C++11)
Le modèle de classe std::future fournit un mécanisme pour accéder à la suite des opérations asynchrones:
Original:
The class template std::future provides a mechanism to access the result of asynchronous operations:
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  • Le créateur de l'opération asynchrone peut alors utiliser une variété de méthodes de requête, attendez, ou extraire une valeur de la std::future. Ces méthodes peuvent bloquer si l'opération asynchrone n'a pas encore fourni une valeur .
    Original:
    The creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std::future. These methods may block if the asynchronous operation has not yet provided a value.
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  • Lorsque l'opération asynchrone est prêt à envoyer un résultat au créateur, il peut le faire en modifiant l'état partagé (par exemple std::promise::set_value) qui est liée à std::future du créateur .
    Original:
    When the asynchronous operation is ready to send a result to the creator, it can do so by modifying shared state (e.g. std::promise::set_value) that is linked to the creator's std::future.
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Notez que les références std::future état partagé qui n'est pas partagée avec d'autres objets de retour asynchrones (par opposition à std::shared_future) .
Original:
Note that std::future references shared state that is not shared with any other asynchronous return objects (as opposed to std::shared_future).
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Sommaire

[modifier] Fonctions membres

construit l'objet avenir
Original:
constructs the future object
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(fonction membre publique) [edit]
Détruit l'objet futur
Original:
destructs the future object
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(fonction membre publique) [edit]
déplace l'objet avenir
Original:
moves the future object
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(fonction membre publique) [edit]
renvoie une référence à shared_future le résultat associé à *this
Original:
returns a shared_future referring to the result associated to *this
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(fonction membre publique) [edit]
Obtenir le résultat
Original:
Getting the result
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retourne le résultat
Original:
returns the result
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(fonction membre publique) [edit]
État
Original:
State
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vérifie si l'avenir est un état partagé avec une promesse
Original:
checks if the future has shared state with a promise
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(fonction membre publique) [edit]
attend le résultat soit disponible
Original:
waits for the result to become available
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(fonction membre publique) [edit]
waits for the result, returns if it is not available for the specified timeout duration
(fonction membre publique) [edit]
attend le résultat, retourne si elle n'est pas disponible jusqu'à ce point dans le temps spécifié a été atteint
Original:
waits for the result, returns if it is not available until specified time point has been reached
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(fonction membre publique) [edit]

[modifier] Exemple

#include <iostream>
#include <future>
#include <thread>
 
int main()
{
    // future from a packaged_task
    std::packaged_task<int()> task([](){ return 7; }); // wrap the function
    std::future<int> f1 = task.get_future();  // get a future
    std::thread(std::move(task)).detach(); // launch on a thread
 
    // future from an async()
    std::future<int> f2 = std::async(std::launch::async, [](){ return 8; });
 
    // future from a promise
    std::promise<int> p;
    std::future<int> f3 = p.get_future();
    std::thread( [](std::promise<int>& p){ p.set_value(9); }, 
                 std::ref(p) ).detach();
 
    std::cout << "Waiting...";
    f1.wait();
    f2.wait();
    f3.wait();
    std::cout << "Done!\nResults are: "
              << f1.get() << ' ' << f2.get() << ' ' << f3.get() << '\n';
}

Résultat :

Waiting...Done!
Results are: 7 8 9

[modifier] Voir aussi

(C++11)
exécute une fonction asynchrone (potentiellement dans un nouveau thread) et renvoie une std::future qui contiendra le résultat
Original:
runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result
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(fonction générique) [edit]
attend une valeur (peut-être référencé par d'autres futurs) qui est fixé de manière asynchrone
Original:
waits for a value (possibly referenced by other futures) that is set asynchronously
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(classe générique) [edit]