text: #include <memory>
  #include <cstdio>
  #include <cstdarg>
  #include <restbed>
  
  using namespace std;
  using namespace restbed;
  
  class CustomLogger : public Logger
  {
      public:
          void stop( void )
          {
              return;
          }
          
          void start( const shared_ptr< const Settings >& )
          {
              return;
          }
          
          void log( const Level, const char* format, ... )
          {
              va_list arguments;
              va_start( arguments, format );
              
              vfprintf( stderr, format, arguments );
              fprintf( stderr, "\n" );
              
              va_end( arguments );
          }
          
          void log_if( bool expression, const Level level, const char* format, ... )
          {
              if ( expression )
              {
                  va_list arguments;
                  va_start( arguments, format );
                  log( level, format, arguments );
                  va_end( arguments );
              }
          }
  };
  