模板方法模式

模板方法模式 在一个方法中定义一个算法的骨架，而将一些步骤延迟到子类中。模板方法使得子类可以在不改变算法结构的情况下，重新定义算法中的某些步骤。

#include <iostream>
#include <string>

using namespace std;

struct CaffeineBeverage {
public:
    prepareRecipe() {
        boilWater();
        brew();
        pourInCup();
        addCondiments();
        hook();
    }
    virtual brew() = 0;
    virtual addCondiments() = 0;
    boilWater() {
        cout << "boilWater" << endl;
    }
    pourInCup() {
        cout << "pourInCup" << endl;
    }
    virtual hook() {}
};

struct Tea : public CaffeineBeverage {
public:
    virtual brew() {
        cout << "Tea: brew" << endl;
    }
    virtual addCondiments() {
        cout << "Tea: addCondiments" << endl;
    }
};

struct Coff : public CaffeineBeverage {
    virtual brew() {
        cout << "Coff: brew" << endl;
    }
    virtual addCondiments() {
        cout << "Coff: addCondiments" << endl;
    }
    virtual hook() {
        cout << "Coff: hook service" << endl;
    }
};


int main(int argc, char **argv)
{
    Tea *myTea = new Tea();
    myTea->prepareRecipe();
    delete myTea;

    Coff *myCoff = new Coff();
    myCoff->prepareRecipe();
    delete myCoff;

    return 0;
}