设计模式之策略模式

策略模式

• 定义了算法家族，分别封装起来，让他们之间可以相互替换
• 让算法变化起来，不会影响到使用算法的用户

//抽象武器策略
class WeaponStrategy
{
public:
	virtual void UseWeapon() = 0;
};

class Knife :public WeaponStrategy
{
public:
	virtual void UseWeapon()
	{
		cout << "使用匕首" << endl;
	}
};

class AK47 :public WeaponStrategy
{
public:
	virtual void UseWeapon()
	{
		cout << "使用AK47!" << endl;
	}
};

class Character
{
public:
	void setWeapon(WeaponStrategy* weapon)
	{
		this->pWeapon = weapon;
	}
	void ThrowWeapon()
	{
		this->pWeapon->UseWeapon();
	}
public:
	WeaponStrategy* pWeapon;
};


void test()
{
	//创建角色
	Character* character = new Character;
	//武器策略
	WeaponStrategy* knife = new Knife;
	WeaponStrategy* ak47 = new AK47;

	character->setWeapon(knife);
	character->ThrowWeapon();
	character->setWeapon(ak47);
	character->ThrowWeapon();

	delete character;
	delete knife;
	delete ak47;

	return;
}