Method write_char

extlibs/fmt/include/fmt/format.h:1857–1862

  };

  void write_char(char_type value) {
    if (specs_)
      writer_.write_padded(*specs_, char_writer{value});
    else
      writer_.write(value);
  }

  void write_pointer(const void* p) {
    writer_.write_pointer(internal::to_uintptr(p), specs_);