text: #pragma once 
  #include "rtc_base/logging.h"
  namespace ns3
  {
  void init_webrtc_log();
  class LogSinkConsole:public rtc::LogSink 
  {
  public: 
      LogSinkConsole(){}
      ~LogSinkConsole(){}
      void OnLogMessage(const std::string &message) override;
      bool Init();
  };
  }