《C++新经典设计模式》之第2章 模板方法模式

《C++新经典设计模式》之第2章 模板方法模式

《C++新经典设计模式》之第2章 模板方法模式

• • • • 模板方法模式.cpp

模板方法模式.cpp

#include <iostream>
#include <memory>
using namespace std;// 动态绑定，多态，稳定+变化
// 稳定，内部函数调用顺序固定
// 变化，内部具体函数调用由各子类决定namespace ns1
{class Warrior // “战士”类{int m_life;   // 生命值int m_magic;  // 魔法值int m_attack; // 攻击力public:Warrior(int life, int magic, int attack) : m_life(life), m_magic(magic), m_attack(attack) {}public:void JN_Burn() // 技能“燃烧”{m_life -= 300;cout << "Lose 500 HP points for each enemy" << endl;cout << "The protagonist loses 300 HP" << endl;cout << "Play the special effect of the "burning" skill to the players" << endl;}};
}namespace ns2
{class Fighter // 战斗者父类{protected:int m_life;   // 生命值int m_magic;  // 魔法值int m_attack; // 攻击力public:Fighter(int life, int magic, int attack) : m_life(life), m_magic(magic), m_attack(attack) {}virtual ~Fighter() {}void JN_Burn() // 技能“燃烧”{if (canUseJN()) // 如果能使用该技能{effect_enemy(); // 对敌人产生的影响effect_self();  // 对主角自身产生的影响play_effect(); // 播放技能“燃烧”的技能特效}}private:virtual bool canUseJN() const = 0; // 判断是否能使用技能“燃烧”，纯虚函数声明，子类中必须实现private:virtual void effect_enemy() const {}virtual void effect_self() {}private:void play_effect() const { cout << "Play the special effect of the "burning" skill to the players" << endl; }};class F_Warrior : public Fighter // “战士”类{public:F_Warrior(int life, int magic, int attack) : Fighter(life, magic, attack) {}private:bool canUseJN() const override { return m_life >= 300; }private:void effect_enemy() const override{cout << "Lose 500 HP points for each enemy" << endl;}void effect_self() override{cout << "The protagonist loses 300 HP" << endl;m_life -= 300;}};class F_Mage : public Fighter // “法师”类{public:F_Mage(int life, int magic, int attack) : Fighter(life, magic, attack) {}private:bool canUseJN() const override { return m_magic >= 100; }private:void effect_enemy() const override{cout << "Lose 650 HP points for each enemy" << endl;}void effect_self() override{cout << "The protagonist loses 100 MV" << endl;m_magic -= 100;}};
}int main()
{
#if 0using namespace ns1;shared_ptr<Warrior> mroleobj(new Warrior(1000, 0, 200));mroleobj->JN_Burn();
#endif#if 1using namespace ns2;shared_ptr<Fighter> fighter(new F_Warrior(1000, 0, 200));fighter->JN_Burn();cout << "-------------------------" << set(new F_Mage(800, 200, 300));fighter->JN_Burn();
#endifcout << "Over!n";return 0;
}