Populate An Array Using Constexpr at Compile-time

Question

I would like to populate an array of enum using constexpr. The content of the array follows a certain pattern.

I have an enum separating ASCII character set into fou

Answer 1

Ignoring ALL the issues, indices to the rescue:

template struct seq{};
template
struct gen_seq : gen_seq{};
template
struct gen_seq<0, Is...> : seq{};

template
constexpr Table MagicFunction(seq){
  return {{ whichCategory(Is)... }};
}

constexpr Table MagicFunction(){
  return MagicFunction(gen_seq<128>{});
}

Live example.