Function write2digits

include/fmt/format.h:1205–1213

// Writes a two-digit value to out.
template <typename Char>
FMT_CONSTEXPR20 FMT_INLINE void write2digits(Char* out, size_t value) {
  if (!is_constant_evaluated() && std::is_same<Char, char>::value &&
      !FMT_OPTIMIZE_SIZE) {
    memcpy(out, digits2(value), 2);
    return;
  }
  *out++ = static_cast<Char>('0' + value / 10);
  *out = static_cast<Char>('0' + value % 10);
}

template <typename Char>
FMT_INLINE void write2digits_i(Char* out, size_t value) {