策略模式

• 类图

• 代码

#include 
    
     using namespace std;class Strategy{public:    Strategy() {}    ~Strategy() {}    virtual void Travel() = 0;    };class StrategyWalk : public Strategy{public:    StrategyWalk()    {}    ~StrategyWalk() {}    void Travel()    {        cout << "I walk to my company." << endl;    }};class StrategyBus : public Strategy{public:    StrategyBus() {}    ~StrategyBus() {}    void Travel()    {        cout << "I go to work by bus." << endl;    }};class User{public:    User() {}    ~User() {}    void GotoWork()    {        this->methord->Travel();    }    void SetStrategy(Strategy *tool)    {        this->methord = tool;    }private:    Strategy *methord;};int main(int argc, char *argv[]){    Strategy *tool = new StrategyBus();    User *tom = new User();    tom->SetStrategy(tool);    tom->GotoWork();    delete tool;    delete tom;    return 0;}