实现 : Defferent Heros attack Defferently. - 不同的英雄使用不用的招数
Strategy设计的思路:
基类A,更加小的基类B,新的继承类C:
1 从基类A中抽出一个更加小的基类B
2 利用这个更加小的基类B实现不同的效果
3 把这个更加小的基类B包含进基类A中去
4 新的继承类C只需要和基类A打交道,设计不同行为,不需要理会更加小的基类B
#pragma once
#ifndef _STRATEGY_HEROS_H
#define _STRATEGY_HEROS_H
#include <stdio.h>
//Interface
class HeroAttack
{
public:
virtual void attack() = 0;
};
//Base method class
class Laser : public HeroAttack
{
public:
void attack()
{
puts("Super Eye-Laser");
}
};
class Smash : public HeroAttack
{
public:
void attack()
{
puts("I smash!");
}
};
class WebWebWeb : public HeroAttack
{
public:
void attack()
{
puts("Web, Web, Web!");
}
};
//Base Class
class Hero_From_Marvel
{
HeroAttack *heroAtt;
protected:
void setAttackWay(HeroAttack *hat)
{
if (heroAtt) delete heroAtt;
heroAtt = hat;
}
public:
Hero_From_Marvel() : heroAtt(nullptr)
{
}
virtual ~Hero_From_Marvel()
{
if (heroAtt) delete heroAtt;
heroAtt = nullptr;
}
void attack()
{
heroAtt->attack();
}
};
//derived class
class SuperMan : public Hero_From_Marvel
{
public:
SuperMan()
{
setAttackWay(new Laser);//这里不能使用malloc,否则内存冲突
}
};
class Hulk : public Hero_From_Marvel
{
public:
Hulk()
{
setAttackWay(new Smash);
}
};
class SpiderMan : public Hero_From_Marvel
{
public:
SpiderMan()
{
setAttackWay(new WebWebWeb);
}
};
int StrategyHerosRun()
{
const int HEROS = 3;
Hero_From_Marvel *hfm[HEROS] = {new SuperMan, new Hulk, new SpiderMan};
for (int i = 0; i < HEROS; i++)
{
hfm[i]->attack();
delete hfm[i];
}
return 0;
}
#endif
Design Pattern 设计模式1 - Strategy 1,布布扣,bubuko.com
Design Pattern 设计模式1 - Strategy 1
原文地址:http://blog.csdn.net/kenden23/article/details/25552967