In a type trait, why do people use enum rather than static const for the value?

Question

For example, this is how I would write it, and it compiles and works just fine:

template struct is_pointer {
  static const bool valu         


        

Answer 1

It also is another symbol in every object file that includes it, to no benefit. If you use symbol folding (--gc-sections) you'll run out of separatable sections & bloat your binary.