https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105470
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Roland Hughes from comment #10) > There is no definition of that map anywhere in the codebase where > KeyModifiers is declared const. That's just how std::map works. std::map<A, B>::value_type is std::pair<const A, B>. See the definition of value_type at https://en.cppreference.com/w/cpp/container/map So when you iterate over a map<A, B> the values you get back are pair<const A, B>. > The method being called returns a const & to the entire map, but there is no > const declared within the map. There is in the map's value_type though, and that's what you iterate over with the range-based for loop.
