装饰模式,
动态地给一个对象添加一些额外的职责,就增加功能来说,装饰模式比生成子类更为灵活。
// Decorator.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
using namespace std;
class IComponent
{
public:
virtual void process() = 0;
};
class Component : public IComponent
{
public:
virtual void process()
{
cout<<"Component process"<<endl;
}
};
class Decorator: public IComponent
{
public:
virtual void process()
{
if ( !myComponent)
myComponent->process();
}
virtual void setComponent( IComponent *component )
{
myComponent = component;
}
~Decorator()
{
if (myComponent)
delete myComponent;
}
protected:
IComponent *myComponent;
};
class ConcreateDecoratorA: public Decorator
{
public:
virtual void process()
{
myComponent->process();
cout<<"ConcreateDecoratorA process"<<endl;
}
};
class ConcreateDecoratorB: public Decorator
{
public:
virtual void process()
{
myComponent->process();
cout<<"ConcreateDecoratorB process"<<endl;
}
};
int _tmain(int argc, _TCHAR* argv[])
{
Component *pComponent = new Component();
ConcreateDecoratorA *pDecoratorA = new ConcreateDecoratorA();
ConcreateDecoratorB *pDecoratorB = new ConcreateDecoratorB();
pDecoratorA->setComponent( pComponent );
pDecoratorA->process();
pDecoratorB->setComponent( pDecoratorA );
pDecoratorB->process();
system("pause");
return 0;
}
转载于:https://www.cnblogs.com/cxrs/archive/2011/12/01/2270957.html