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.       // usage: mutex my_mutex(bool cond) {     return std::factory<mutex>(         [&cond](auto mut) {             if (cond)                 mut.lock();         }     ); }   -----Ursprüngliche Nachricht----- Von:Tiago Freire via Std-Proposals <std-proposals_at_[hidden]> Gesendet:Mo 20.05.2024 11:11 Betreff:Re: [std-proposals] std::elide An:std-proposals_at_[hidden]; CC:Tiago Freire <tmiguelf_at_[hidden]>; Or just do this instead: int main(void) {    mutex m;    m.lock(); } Does exactly the same thing, saves on functions calls, don't have to write a function, don't need to add a language feature, don't have to abuse the language, it actually makes sense from what a mutex is, its shorter, concise, transparent, clear. Some problems don't need solving because they were never problems to begin with.