See here, why break N is a bad idea. The same applies to %%   https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3568r0.html   -----Ursprüngliche Nachricht----- Von:Frederick Virchanza Gotham via Std-Proposals <std-proposals_at_[hidden]> Gesendet:Sa 23.05.2026 10:23 Betreff:Re: [std-proposals] return value lives until end of scope An:std-proposals_at_[hidden]; CC:Frederick Virchanza Gotham <cauldwell.thomas_at_[hidden]>; On Saturday, May 23, 2026, Sebastian Wittmeier wrote:   You can use a single variable (container for futures) and use it as reference parameter to a function creating your async call.   I think the following:  int main() {  for ( unsigned i = 0u; i < N; ++i ) {     %%async(Func); }  }  would have to be implemented by the compiler something like:  int main() {  struct Frame {     alignas(std::future<int>) char unsigned f[ sizeof(std::future<int>) ];     Frame *next; };  Frame fr; Frame *p = &fr;  for ( unsigned i = 0u; i < N; ++i ) {     ::new(p->f) std::future<int>{ async(Func) };     p->next = alloca( sizeof *p );     p->next.next = nullptr;     p = p->next; }  for ( p = &fr; nullptr != p; p = p->next ) {     ((std::future<int>*)p->f)->~std::future<int>();     }    -- Std-Proposals mailing list Std-Proposals_at_[hidden] https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals