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std::packaged_task

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C++
 
Thema Support-Bibliothek
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)
Gegenseitigen Ausschluss
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generische Sperrverwaltung
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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)
Zustand Variablen
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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
Member-Funktionen
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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
Erste das Ergebnis
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Getting the result
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packaged_task::get_future
Execution
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Execution
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packaged_task::operator()
packaged_task::make_ready_at_thread_exit
packaged_task::reset
 
definiert in Header <future>
template< class > class packaged_task; //not defined
 (1) (seit C++11)
template< class R, class Args... >
class packaged_task<R(Args...)>;
 (2) (seit C++11)
Das Klassen-Template std::packaged_task wickelt jede aufrufbare Ziel (Funktion, Lambda-Ausdruck, bind Ausdruck oder eine andere Funktion Objekt), so dass es asynchron aufgerufen werden kann, und dessen Rückgabewert oder Ausnahme ausgelöst wird im gemeinsamen Staat, die durch zugegriffen werden kann std::future Objekte .
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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Genau wie std::function, std::packaged_task ist ein polymorpher, allocator-aware Container: die gespeicherte kündbare Ziel kann auf Heap oder mit einem vorgesehenen allocator zugeordnet werden .
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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Inhaltsverzeichnis

[Bearbeiten] Member-Funktionen
baut das Task-Objekt
Original:
constructs the task object
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(öffentliche Elementfunktion) [edit]
zerstört sich die Task-Objekt
Original:
destructs the task object
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(öffentliche Elementfunktion) [edit]
bewegt das Task-Objekt
Original:
moves the task object
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(öffentliche Elementfunktion) [edit]
prüft, ob der Task-Objekt verfügt über eine gültige Funktion
Original:
checks if the task object has a valid function
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(öffentliche Elementfunktion) [edit]
Swaps zwei Task-Objekte
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swaps two task objects
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(öffentliche Elementfunktion) [edit]
Erste das Ergebnis
Original:
Getting the result
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gibt eine std::future mit dem versprochenen Ergebnis assoziiert
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returns a std::future associated with the promised result
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(öffentliche Elementfunktion) [edit]
Execution
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Execution
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führt die Funktion
Original:
executes the function
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(öffentliche Elementfunktion) [edit]
führt die Funktion sicherzustellen, dass das Ergebnis fertig ist erst einmal die aktuelle Thread beendet
Original:
executes the function ensuring that the result is ready only once the current thread exits
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(öffentliche Elementfunktion) [edit]
setzt der Staat aufzugeben, alle gespeicherten Ergebnisse der vorherigen Ausführungen
Original:
resets the state abandoning any stored results of previous executions
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(öffentliche Elementfunktion) [edit]

[Bearbeiten] Non-Member-Funktionen

(C++11)
spezialisiert die std::swap Algorithmus
Original:
specializes the std::swap algorithm
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(Funktions-Template) [edit]

[Bearbeiten] Helper-Klassen

(C++11)
spezialisiert die std::uses_allocator Typ Merkmal
Original:
specializes the std::uses_allocator type trait
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(class Template-Spezialisierung) [edit]

[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

(C++11)
wartet auf einen Wert, der asynchron ist
Original:
waits for a value that is set asynchronously
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(Klassen-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/thread/packaged_task&oldid=30062“