Another more flexible variant could be a template<class T> std::forward_modified(Callable getter, Callable modifier);   which would not construct the initial object by itself, but take the return value of another function as argument (with guaranteed RVO). return std::forward_modified(getmutex, lockit);     -----Ursprüngliche Nachricht----- Von:Frederick Virchanza Gotham via Std-Proposals <std-proposals_at_[hidden]> Gesendet:Di 21.05.2024 00:00 Betreff:Re: [std-proposals] std::elide An:std-proposals_at_[hidden]; CC:Frederick Virchanza Gotham <cauldwell.thomas_at_[hidden]>; On Mon, May 20, 2024 at 9:51 PM Sebastian Wittmeier via Std-Proposals <std-proposals_at_[hidden]> wrote: > > This feature request could be also made to a standard library function. > > // Calls the constructor and a setup function. With guaranteed RVO. > > T std::factory<T>(params, ..., setup) > > No need for other language changes or any special exception handling. I've tried to implement it here:    https://godbolt.org/z/v99dvGqnn