#ifndef __DUAL_CONTROL_LOGGING
 #define __DUAL_CONTROL_LOGGING
 
 #include <memory>
 #include <string>
 

 class logger_ifc
 {
 public:
     virtual ~logger_ifc() {}

     virtual void log (int result, const std::string &user_name,
                       const std::string &token) {};

 };

 class logger : public logger_ifc
 {
 private:
     std::shared_ptr<logger_ifc> delegate_;
 public:

     logger (const std::shared_ptr<logger_ifc> &delegate) : delegate_
         (delegate) {}
     logger() : logger (std::shared_ptr<logger_ifc> (new logger_ifc)) {}
     void log (int result, const std::string &user_name,
               const std::string &token)

     {

         delegate_->log (result, user_name, token);

     }

 };

 
 #endif