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std::launch

Da cppreference.com.
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Discussione libreria di supporto
Threads
Original:
Threads
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thread(C++11)
this_thread spazio dei nomi
Original:
this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Mutua esclusione
Original:
Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Blocco di gestione generico
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)
Condizioni variabili
Original:
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
Original:
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)
 
Defined in header <future>
enum class launch : /* unspecified */ {

    async =    /* unspecified */,
    deferred = /* unspecified */,
    /* implementation-defined */

};
(dal C++11)
Specifica il criterio di lancio per un compito eseguito dalla funzione std::async. std::launch è un BitmaskType (enumerazione, intero o bitset).
Original:
Specifies the launch policy for a task executed by the std::async function. std::launch is a BitmaskType (enumeration, integer, or bitset).
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Le seguenti costanti che denotano i singoli bit sono definiti dalla libreria standard:
Original:
The following constants denoting individual bits are defined by the standard library:
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Constant
Original:
Constant
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Explanation
std::launch::async
un nuovo thread viene avviato per eseguire l'operazione in modo asincrono
Original:
a new thread is launched to execute the task asynchronously
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std::launch::deferred
l'attività viene eseguito sul thread chiamante la prima volta che viene richiesto il suo risultato (valutazione pigra)
Original:
the task is executed on the calling thread the first time its result is requested (lazy evaluation)
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Inoltre, le implementazioni possono:
Original:
In addition, implementations are allowed to:
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  • definire ulteriori bit e maschere di bit per specificare le restrizioni sulle interazioni delle attività applicabili a un sottoinsieme di politiche di lancio, e
    Original:
    define additional bits and bitmasks to specify restrictions on task interactions applicable to a subset of launch policies, and
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  • attivare le maschere di bit aggiuntivi per il primo (default) sovraccarico di std::async.
    Original:
    enable those additional bitmasks for the first (default) overload of std::async.
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[modifica] Vedi anche

(C++11)
esegue una funzione in modo asincrono (potenzialmente in un nuovo thread) e restituisce un std::future che conterrà il risultato
Original:
runs a function asynchronously (potentially in a new thread) and returns a std::future that will hold the result
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(funzione di modello) [edit]