Method format_signed

extlibs/fmt/include/fmt/format.h:2883–2889

  }

  void format_signed(long long value) {
    auto abs_value = static_cast<unsigned long long>(value);
    bool negative = value < 0;
    if (negative) abs_value = 0 - abs_value;
    str_ = format_decimal(abs_value);
    if (negative) *--str_ = '-';
  }

 public:
  explicit format_int(int value) { format_signed(value); }