设计模式：strategy模式

思想：将算法进行抽象，然后使用桥接的模式使用算法的抽象接口，达到算法整体替换的目的

理解：和桥接模式相同，只是桥接的两边分开的思想不同

例子：

class Algrithm  //算法的抽象
{
public:
	virtual void algrithm() = 0;
};

class AlgrithmA: public Algrithm
{
public:
	void algrithm()
	{
		cout << "AlgrithmA" << endl;
	}
};

class AlgrithmB: public Algrithm
{
public:
	void algrithm()
	{
		cout << "AlgrithmB" << endl;
	}
};

class Content
{
	Algrithm* pAlgrithm;   //桥接模式
public:
	Content(Algrithm* pAlgrithm)
	{
		this->pAlgrithm = pAlgrithm;
	}
	
	void done()
	{
		this->pAlgrithm->algrithm();
	}
};

int main() 
{
	Content t1(new AlgrithmA());
	t1.done();
	
	Content t2(new AlgrithmB());
	t2.done();
	
	return 0;
}