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Showing content from https://timsong-cpp.github.io/cppwp/n4140/thread.once.onceflag below:

[thread.once.onceflag]

constexpr once_flag() noexcept;

Effects: Constructs an object of type once_flag.

Synchronization: The construction of a once_flag object is not synchronized.

Postcondition: The object's internal state is set to indicate to an invocation of call_once with the object as its initial argument that no function has been called.

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