Varianti

    std::once_flag

    Da cppreference.com.

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    <tbody> </tbody>
    Elemento definito nell'header <mutex>
    class once_flag;
    		 (dal C++11)

    The class std::once_flag is a helper structure for std::call_once.

    An object of type std::once_flag that is passed to multiple calls to std::call_once allows those calls to coordinate with eachother such that only one of the calls will actually run to completion.

    std::once_flag is noncopyable.

    Membri funzioni

    std::once_flag::once_flag

    <tbody> </tbody>
    once_flag();

    Constructs an once_flag object. The internal state is set to indicate that no function has been called yet.

    Parameters

    (none)

    Exceptions

    noexcept specification:  
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    noexcept
      (dal C++11)

    Vedi anche

    (C++11)
    richiama una funzione solo una volta, anche se chiamato da più thread
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    invokes a function only once even if called from multiple threads
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    (funzione di modello) [modifica]