Concat two `const char` string literals

Question

Is it possible to concat two string literals using a constexpr? Or put differently, can one eliminate macros in code like:

#define nl(str) str \         


        

Answer 1

Nope, for constexpr you need a legal function in the first place, and functions can't do pasting etc. of string literal arguments.

If you think about the equivalent expression in a regular function, it would be allocating memory and concatenating the strings - definitely not amenable to constexpr.