Decorator (C ++ implementation)

// Decorator. cpp: defines the entry point of the console application.
//

# Include "stdafx. H"
# Include <iostream>

Using namespace STD;

 

Class component
{
Public:
Component ()
{
}
Virtual ~ Component ()
{
}

Virtual void operation () = 0;
};

 

 

 

Class concretecomponent: public component
{
Public:
Concretecomponent ()
{
Cout <"Construction of concretecomponet" <Endl;
}
Virtual ~ Concretecomponent ()
{
}

Virtual void operation ()
{
Cout <"opearation of concretecomponet" <Endl;
}
};

 

 

 

Class decorator: public component
{
Public:
Decorator (component * m_p): m_pcomponet (m_p)
{

}

Virtual ~ Decorator ()
{
Delete m_pcomponet;
M_pcomponet = NULL;
}

Virtual void operation ()
{
 M_pcomponet-> operation ();
}

PRIVATE:
Component * m_pcomponet;

};

Class concretedecoratea: Public decorator
{
Public:
Concretedecoratea (component * m_p): decorator (m_p)
{
Cout <"Construction of concretedecoratea" <Endl;
}
Virtual ~ Concretedecoratea ()
{
}
Virtual void operation ()
{
Cout <"Operation of concretedecoratea" <Endl;
Decorator: Operation ();
Drawline ();
}

PRIVATE:
Void drawline ()
{
Cout <"----------------------------" <Endl;
}

};

Class concretedecorateb: Public decorator
{
Public:
Concretedecorateb (component * m_p): decorator (m_p)
{
Cout <"Construction of concretedecorateb" <Endl;
}
Virtual ~ Concretedecorateb ()
{
}
Virtual void operation ()
{
Cout <"Operation of concretedecorateb" <Endl;
Decorator: Operation ();
Drawnumber ();
}
 
PRIVATE:
Void drawnumber ()
{
Cout <"1-2-3-4-5-6-7-8-9-0" <Endl;
}

};
Int _ tmain (INT argc, _ tchar * argv [])
{
Component * pcomponent = new concretecomponent ();
Decorator * pdecorator1 = new concretedecoratea (pcomponent );
Decorator * pdecorator2 = new concretedecorateb (pdecorator1 );
Pdecorator2-> operation ();

Return 0;
}

 

 

Result: