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std::once_flag

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Defined in header <mutex>
class once_flag;
(a partir do 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.

Índice

[editar] Funções de membro

std::once_flag::once_flag

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:  
noexcept
  (a partir do C++ 11)

[editar] Veja também

(C++11)
chama uma função apenas uma vez, mesmo se chamado de vários segmentos
Original:
invokes a function only once even if called from multiple threads
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(modelo de função) [edit]