This is extremely off topic — what does any of this have to do with constexpr strings?

Er, I'm way out of touch with modern c++, what implementation do you buy? Borland used to have tons of little helpers and utils to smooth over some rough edges.

I'd imagine ms vc++ has tons of stuff to support this?

Again, I haven't used a commercial compiler in a while. But that seems like really standard stuff you get with them, yeah?

3rd party libraries provide that functionality, and do it with higher performance than in any other another language