[gnulinux]

It used to be a misuse (when metaprogramming was templates and then after the very first constexpr functions were introduced) since back then metaprogramming was intended to decide simple facts about the program and make inlining easier. But in this standard they actually made it so that pretty much all C++ stdlib can be constexpr and it is encouraged to "constexpr everything". So while this is not an abuse of C++ compiler, it's likely not a fantastic idea since C++ compilers tend to be slow.