Method write

extlibs/fmt/include/fmt/chrono.h:872–880

  }

  void write(Rep value, int width) {
    write_sign();
    if (isnan(value)) return write_nan();
    uint32_or_64_or_128_t<int> n =
        to_unsigned(to_nonnegative_int(value, max_value<int>()));
    int num_digits = internal::count_digits(n);
    if (width > num_digits) out = std::fill_n(out, width - num_digits, '0');
    out = format_decimal<char_type>(out, n, num_digits);
  }

  void write_nan() { std::copy_n("nan", 3, out); }
  void write_pinf() { std::copy_n("inf", 3, out); }