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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../thread/once_flag.html below:

std::once_flag - cppreference.com

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.

[edit] Member functions std::once_flag::once_flag

constexpr once_flag() noexcept;

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

Parameters

(none)

[edit] See also

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