Varianti

    std::packaged_task::valid

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    <metanoindex/>

     
    C++
     
    Discussione libreria di supporto
    Threads
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    Threads
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    thread(C++11)
    this_thread spazio dei nomi
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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)
    Mutua esclusione
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    Mutual exclusion
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    mutex(C++11)
    timed_mutex(C++11)
    Blocco di gestione generico
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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)
    Condizioni variabili
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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
    Membri funzioni
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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
    Ottenere il risultato
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    Getting the result
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    packaged_task::get_future
    Esecuzione
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    Execution
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    packaged_task::operator()
    packaged_task::make_ready_at_thread_exit
    packaged_task::reset
     
    <tbody> </tbody>
    bool valid() const;
    		 (dal C++11)

    Checks whether *this has a shared state.

    Parametri

    (Nessuno)
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    (none)
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    Valore di ritorno

    true if *this has a shared state, false otherwise.

    Eccezioni

    noexcept specification:  
    <tbody> </tbody>
    noexcept
      (dal C++11)