I can now compile GlobalConstants.hh both with and without -std=c++11 or -std=gnu++11 which, arguably, is cleaner than asking gcc to clutter up its complex class with two more overloaded access ...

Version 17.14 also offers new C++23 functions that can be added to the command line with the flags /std:c++latest or /std:c++23preview.The if consteval function, for example, distinguishes between ...