https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105885
--- Comment #3 from Markus Ebner <i...@ebner-markus.de> --- > I guess reporters reasoning is that ARG is defaulted to nullptr and that's > the reason the diagnostic is unwanted? I don't think it has any todo with whether nullptr is the default value for ARG or not. Even if it's not the default value, it is a valid one the API's user might explicitly pass to ARG. My point rather is that, at least the way I understood it, `if constexpr` is meant to implement conditional behavior based on a template argument. And it is obvious that one of the if-branches is going to be comparing ARG to whatever was passed in for it. So the compiler warning about this didn't make much sense for me here. Of course I could use template specialization to get rid of the warning, but what if the function body is very long and only a tiny fraction of it needs special handling for ARG? Then I would be copying the function body multiple times for all specializations.
