quackbehavior.h

head first 设计模式中的策略模式的C++实现代码

class QuackBehavior //abstract class:a interface
{
public:
	virtual void quack() = 0;//pure virtural method
};

class Squeak : public QuackBehavior
{
public:
	void quack()
	{
		cout<<"Squeak!"<<endl;
	}
};

class Mutequack : public QuackBehavior
{
public:
	void quack()
	{
		cout<<"<<Silence>>!"<<endl;
	}
};

class Quack : public QuackBehavior
{
public:
	void quack()
	{
		cout<<"Quack!"<<endl;
	}
};