Re: [boost] Ruben's Hash2 review

Ruben Perez wrote:

As a matter of curiosity: which compilers do not support __builtin_is_constant_evaluated? (as they will always get the slow memcpy implementation, even at runtime).

__builtin_is_constant_evaluated is supported by * Clang 9 and above (https://godbolt.org/z/4obMEj9fc) * GCC 9 and above (https://godbolt.org/z/5PdMsqezx) * MSVC 19.25+ (VS2017.something)