fixed_string.hh

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#pragma once
 
namespace DiFfRG
{
  template <unsigned N> struct FixedString {
    char buf[N + 1]{};
 
    constexpr FixedString(char const *s)
    {
      for (unsigned i = 0; i != N; ++i)
        buf[i] = s[i];
    }
 
    constexpr operator char const *() const { return buf; }
 
    auto operator<=>(const FixedString &) const = default;
  };
 
  template <unsigned N> FixedString(char const (&)[N]) -> FixedString<N - 1>;
} // namespace DiFfRG