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#include <iostream>

using namespace std;

class Component

{

public:

Component();

virtual ~Component();

virtual void Operation() = 0;

};

class ConcreteComponent : public Component

{

public:

ConcreteComponent();

virtual ~ConcreteComponent();

virtual void Operation();

};

class Decorator : public Component

{

protected:

Component* _com;

public:

Decorator(Component* com);

virtual ~Decorator();

virtual void Operation();

void SetComponent(Component* com);

};

class ConcreteDecoratorA : public Decorator

{

public:

ConcreteDecoratorA(Component* com);

virtual ~ConcreteDecoratorA();

virtual void Operation();

private:

void AddBehavorA();

};

class ConcreteDecoratorB : public Decorator

{

public:

ConcreteDecoratorB(Component* com);

virtual ~ConcreteDecoratorB();

virtual void Operation();

private:

void AddBehavorB();

};

class ConcreteDecoratorC : public Decorator

{

public:

ConcreteDecoratorC(Component* com);

virtual ~ConcreteDecoratorC();

virtual void Operation();

private:

void AddBehavorC();

};

class ConcreteDecoratorD : public Decorator

{

public:

ConcreteDecoratorD(Component* com);

virtual ~ConcreteDecoratorD();

virtual void Operation();

private:

void AddBehavorD();

};

Component::Component()

{

}

Component::~Component()

{

cout << "~Component" << endl;

}

ConcreteComponent::ConcreteComponent()

{

}

ConcreteComponent::~ConcreteComponent()

{

cout << "~ConcreteComponent" << endl;

}

void ConcreteComponent::Operation()

{

cout << "ConcreteComponent::Operation" << endl;

}

Decorator::Decorator(Component* com)

{

_com = com;

}

Decorator::~Decorator()

{

}

void Decorator::SetComponent(Component* com)

{

_com = com;

}

void Decorator::Operation()

{

}

ConcreteDecoratorA::ConcreteDecoratorA(Component *com): Decorator(com)

{

}

ConcreteDecoratorA::~ConcreteDecoratorA()

{

cout << "~ConcreteDecoratorA" << endl;

}

void ConcreteDecoratorA::Operation()

{

_com->Operation();

AddBehavorA();

}

void ConcreteDecoratorA::AddBehavorA()

{

cout << "ConcreteDecoratorA::AddBehaveorA" << endl;

}

ConcreteDecoratorB::ConcreteDecoratorB(Component *com): Decorator(com)

{

}

ConcreteDecoratorB::~ConcreteDecoratorB()

{

cout << "~ConcreteDecoratorB" << endl;

}

void ConcreteDecoratorB::Operation()

{

_com->Operation();

AddBehavorB();

}

void ConcreteDecoratorB::AddBehavorB()

{

cout << "ConcreteDecoratorB::AddBehaveorB" << endl;

}

ConcreteDecoratorC::ConcreteDecoratorC(Component *com): Decorator(com)

{

}

ConcreteDecoratorC::~ConcreteDecoratorC()

{

cout << "~ConcreteDecoratorC" << endl;

}

void ConcreteDecoratorC::Operation()

{

_com->Operation();

AddBehavorC();

}

void ConcreteDecoratorC::AddBehavorC()

{

cout << "ConcreteDecoratorC::AddBehaveorC" << endl;

}

ConcreteDecoratorD::ConcreteDecoratorD(Component *com): Decorator(com)

{

}

ConcreteDecoratorD::~ConcreteDecoratorD()

{

cout << "~ConcreteDecoratorD" << endl;

}

void ConcreteDecoratorD::Operation()

{

_com->Operation();

AddBehavorD();

}

void ConcreteDecoratorD::AddBehavorD()

{

cout << "ConcreteDecoratorD::AddBehaveorD" << endl;

}

int main(int argc, char *argv[])

{

Component* pCom = new ConcreteComponent();

Decorator* pDec = NULL;

pDec = new ConcreteDecoratorA(pCom);

pDec = new ConcreteDecoratorB(pDec);

pDec = new ConcreteDecoratorC(pDec);

pDec = new ConcreteDecoratorD(pDec);

pDec->Operation();

cout << "------------------------------------------" << endl;

system("pause");

return 0;

}