  std::string format_message(int id, const char *format,const fmt::ArgList &args) const {
    MemoryWriter w;
    w.write("[{}] ", id);
    w.write(format, args);
    return w.str();
  }
  std::string format_message(int id, const char *format,const fmt::ArgList &args) const {
    MemoryWriter w;
    w.write("[{}] ", id);
    w.write(format, args);
    return w.str();
  }