fixed_string.hh

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#pragma once
 
#include <initializer_list>
 
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 FixedString(std::initializer_list<char> s)
    {
      unsigned i = 0;
      for (auto c : s) {
        buf[i] = c;
        ++i;
      }
    }
 
    constexpr FixedString(char const (&arr)[N])
    {
      for (unsigned i = 0; i < N; ++i)
        buf[i] = arr[i];
    }
 
    constexpr operator char const *() const { return buf; }
 
    auto operator<=>(const FixedString &) const = default;
  };
 
  template <unsigned N> FixedString(char const (&)[N]) -> FixedString<N - 1>;
 
  template <unsigned N1, unsigned N2> consteval bool strings_equal(FixedString<N1> s1, FixedString<N2> s2)
  {
    if (N1 != N2) return false;
    for (unsigned i = 0; i < N1; ++i)
      if (s1.buf[i] != s2.buf[i]) return false;
    return true;
  }
} // namespace DiFfRG