Only the debug version catches it at runtime and not the release version. Not even at compile time That is not usable enough for a standard library class. -----Ursprüngliche Nachricht----- Von:Frederick Virchanza Gotham via Std-Proposals <std-proposals_at_[hidden]> Gesendet:Di 03.02.2026 00:34 Betreff:Re: [std-proposals] [Idea] Null-terminated string view (c_str_view / c_wstr_view) – a simpler alternative/complement to zstring_view An:std-proposals_at_[hidden]; CC:Frederick Virchanza Gotham <cauldwell.thomas_at_[hidden]>; On Mon, Feb 2, 2026 at 10:30 AM Sebastian Wittmeier via Std-Proposals <std-proposals_at_[hidden]> wrote: > > No, just call a function (from a single thread) breaks it: > > > > f(ts.substr(4, 7), ts.substr(6, 2)); The debug version catches that error: https://godbolt.org/z/7MWb71v13