Method write_decimal

extlibs/fmt/include/fmt/format.h:1469–1478

  // Writes a decimal integer.
  template <typename Int> void write_decimal(Int value) {
    auto abs_value = static_cast<uint32_or_64_or_128_t<Int>>(value);
    bool negative = is_negative(value);
    // Don't do -abs_value since it trips unsigned-integer-overflow sanitizer.
    if (negative) abs_value = ~abs_value + 1;
    int num_digits = count_digits(abs_value);
    auto&& it = reserve((negative ? 1 : 0) + static_cast<size_t>(num_digits));
    if (negative) *it++ = static_cast<char_type>('-');
    it = format_decimal<char_type>(it, abs_value, num_digits);
  }

  // The handle_int_type_spec handler that writes an integer.
  template <typename Int, typename Specs> struct int_writer {