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

       Generated automatically by Doxygen for libstdc++ from the source code.

                                                    libstdc++                               std::once_flag(3cxx)

std::once_flag::once_flag(constonce_flag&)[delete]
       Deleted copy constructor.

       Flag type used by std::call_once.

template<typename_Callable,typename..._Args>voidcall_once(once_flag&__once,_Callable&&__f,_Args&&...__args)[friend]
       Invoke a callable and synchronize with other calls using the same flag.

once_flag&std::once_flag::operator=(constonce_flag&)[delete]
       Deleted assignment operator.

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

       #include <mutex>

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

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