1】什么是策略模式？坊间的解释都比较拗口，而且不好理解。所谓策略模式，先构建一个策略(即子类的实例)，再利用这个具体的实例构建一个策略对象，通过调用策略对象的接口可以达到相应具体策略的结果。【2】策略模式代码示例代码示例：/* * 策略模式 */#include#include #include using namespace std;class CashSuper{public: virtual double acceptMoney(double money) = 0;};class CashNormal : public CashSuper{public: double acceptMoney(double money) { return money; }};class CashRebate : public CashSuper{private: double discount;public: CashRebate(double dis) { discount = dis; } double acceptMoney(double money) { return money * discount; }};class CashReturn : public CashSuper{private: double moneyCondition; double moneyReturn;public: CashReturn(double mc, double mr) { moneyCondition = mc; moneyReturn = mr; } double acceptMoney(double money) { double result = money; if (money >= moneyCondition) { result = money - floor(money / moneyCondition) * moneyReturn; } return result; }};class CashContext{private: CashSuper *cs;public: CashContext(CashSuper *cs) { this->cs = cs; } double getResult(double money) { return cs->acceptMoney(money); }};void main(){ CashSuper *cs; CashContext *cc; double money = 1000; cs = new CashRebate(0.8); cc = new CashContext(cs); cout << cc->getResult(money) << endl; money = 1000; cs = new CashNormal(); cc = new CashContext(cs); cout << cc->getResult(money) << endl;}
【3】策略与工厂结合模式代码示例/* * 策略与工厂模式 */#include#include #include using namespace std;class CashSuper{public: virtual double acceptMoney(double money) = 0;};class CashNormal : public CashSuper{public: double acceptMoney(double money) { return money; }};class CashRebate : public CashSuper{private: double discount;public: CashRebate(double dis) { discount = dis; } double acceptMoney(double money) { return money * discount; }};class CashReturn : public CashSuper{private: double moneyCondition; double moneyReturn;public: CashReturn(double mc, double mr) { moneyCondition = mc; moneyReturn = mr; } double acceptMoney(double money) { double result = money; if (money >= moneyCondition) { result = money - floor(money / moneyCondition) * moneyReturn; } return result; }};class CashContext{private: CashSuper *cs;public: CashContext(string str) { if ("正常收费" == str) { cs = new CashNormal(); } else if ("打9折" == str) { cs = new CashRebate(0.9); } else if ("满300送200" == str) { cs = new CashReturn(300, 200); } } double getResult(double money) { return cs->acceptMoney(money); }};int main(){ double money = 1000; CashContext *cc = new CashContext("打9折"); cout << cc->getResult(money); return 0;}
http://www.cnblogs.com/Braveliu/p/3938368.html