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    std::once_flag

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    definiert in Header <mutex>
    class once_flag;
    		 (seit 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.

    Member-Funktionen

    std::once_flag::once_flag

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    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
      (seit C++11)

    Siehe auch

    (C++11)
    ruft eine Funktion nur einmal, auch wenn von mehreren Threads aufgerufen
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    invokes a function only once even if called from multiple threads
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