Good point, thanks. (Though I've just checked gcc's definition of std::clamp and it looks like __glibcxx_assert(!(__hi < __lo)); return (__val < __lo)

Good point, thanks. (Though I've just checked gcc's definition of std::clamp and it looks like __glibcxx_assert(!(__hi < __lo)); return (__val < __lo) ? __lo : (__hi < __val) ? __hi : __val; so order of arguments does matter there.)