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std::once_flag

Defined in header `<mutex>`
class once_flag;		(since 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 each other such that only one of the calls will actually run to completion.

std::once_flag is neither copyable nor movable.

Member functions

std::once_flag::once_flag

constexpr 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

See also

(C++11)

invokes a function only once even if called from multiple threads
(function template)

Links:

http://en.cppreference.com/w/cpp/thread/once_flag

doc_CPP

2016-10-11 10:05:31

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