std::once_flag
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Defined in header
<mutex> |
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class once_flag;
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(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
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constexpr once_flag() noexcept;
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Constructs an once_flag object. The internal state is set to indicate that no function has been called yet.
Parameters
(none)
See also
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(C++11)
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invokes a function only once even if called from multiple threads (function template) |