namespace std {
struct once_flag {
constexpr once_flag() noexcept;
once_flag(const once_flag&) = delete;
once_flag& operator=(const once_flag&) = delete;
};
}
The class once_flag is an opaque data structure that call_once uses to initialize data without causing a data race or deadlock.
constexpr once_flag() noexcept;
Effects: Constructs an object of type once_flag.
Synchronization: The construction of a once_flag object is not synchronized.
Postconditions: 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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