#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) {};
 };
 typedef std::shared_ptr<logger_ifc> logger;
 
 #endif