在策略模式（Strategy Pattern）中，一个类的行为或其算法可以在运行时更改。这种类型的设计模式属于行为型模式。

在策略模式中，我们创建表示各种策略的对象和一个行为随着策略对象改变而改变的 context 对象。策略对象改变 context 对象的执行算法。

代码实例：

#include<iostream>

using namespace std;

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:
    WeaponStrategy* pWeapon;

    void setWeapon(WeaponStrategy* weapon)
    {
        this->pWeapon = weapon;
    }

    void ThrowWeapon()
    {
        this->pWeapon->UseWeapon();
    }
};

void test1()
{
    //创建角色
    Character* character = new Character;
    //创建武器
    WeaponStrategy* knife = new Knife;
    WeaponStrategy* ak47 = new AK47;

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

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

    delete ak47;
    delete knife;
    delete character;
}

int main()
{
    test1();
    return 0;
}

 运行结果：