std::once_flag(3) Library Functions Manual std::once_flag(3)

std::once_flag - Flag type used by std::call_once.

#include <mutex>


once_flag (const once_flag &)=delete
Deleted copy constructor. once_flag & operator= (const once_flag &)=delete
Deleted assignment operator.


template<typename _Callable , typename... _Args> void call_once (once_flag &__once, _Callable &&__f, _Args &&... __args)
Invoke a callable and synchronize with other calls using the same flag.

Flag type used by std::call_once.

Deleted copy constructor.

once_flag & std::once_flag::operator= (const once_flag &) [delete]

Deleted assignment operator.

Invoke a callable and synchronize with other calls using the same flag.

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