设计模式：strategy

最新推荐文章于 2025-09-05 15:44:31 发布

原创最新推荐文章于 2025-09-05 15:44:31 发布 · 470 阅读

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#设计模式 #class #c++

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本文通过一个鸭子的行为模拟实例介绍了策略模式在C++中的实现方式。该实例展示了如何通过接口分离行为并实现在运行时动态更改对象的行为。

//============================================================================
// Name        : strategy_pattern.cpp
// Author      : 
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
using namespace std;

class InterfaceFly
{
public:
	virtual void fly()=0;
};

class InterfaceQuack
{
public:
	virtual void quack()=0;
};


class Duck
{
public:
	InterfaceFly *instance_fly;
	InterfaceQuack *instance_quack;

	void swim();
	void setFly(InterfaceFly *p){instance_fly=p;}
	void setQuack(InterfaceQuack *p){instance_quack=p;}
	void performFly(){instance_fly->fly();}
	void performQuack(){instance_quack->quack();}
};

class FlyNoWing: public InterfaceFly
{
public:
	void fly(){cout<<"I can't fly\n";}
};

class FlyWithWing: public InterfaceFly
{
public:
	void fly(){cout<<"I'm flying\n";}
};

class Quack: public InterfaceQuack
{
public:
	void quack(){cout<<"I'm quacking\n";}
};
class MuteQuack: public InterfaceQuack
{
public:
	void quack(){cout<<"I can't quack\n";}
};

class MalaDuck: public Duck
{
public:

	MalaDuck(){
		instance_fly = new FlyWithWing();
		instance_quack = new MuteQuack();
	}
};

class SalaDuck: public Duck
{

};

int main() {
	cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!

	Duck *maladuck = new MalaDuck();

	maladuck->performFly();
	maladuck->performQuack();

	maladuck->setFly(new FlyNoWing());
	maladuck->performFly();

	return 0;
}