#include <array>
  #include <tuple>

  constexpr std::array<char, 11> itos(unsigned n) {
      std::array<char, 11> s;
      unsigned i = 0;
      while (n) {
          s[i++] = '0' + (n % 10);
          n /= 10;
      }
      s[i] = '\0';
      return s;
  }
  template<auto V>
  struct static_value {
      static constexpr auto value = V;
  };

  template<class T, unsigned N>
  struct tuple_accessor;
  
  template<class...T, unsigned N>
  struct tuple_accessor<std::tuple<T...>, N> {
      static constexpr const char *name = static_value<itos(N)>::value.data();
  };