适配器模式

适配器模式 将一个类的接口，转换成客户期望的另一个接口。适配器让原来接口不兼容的类可以合作无间。

#include <iostream>
#include <string>


using namespace std;


struct Duck {
    virtual quack() = 0;
    virtual fly() = 0;
};

struct MallardDuck : public Duck {
    virtual quack() {
        cout << "Quack" << endl;
    }
    virtual fly() {
        cout << "I'm flying" << endl;
    }
};


struct Turkey {
    virtual gobble() = 0;
    virtual fly() = 0;
};

struct WildTurkey : public Turkey {
    virtual gobble() {
        cout << "Gobble gobble" << endl;
    }
    virtual fly() {
        cout << "I'm flying a short distance" << endl;
    }
};


struct TurkeyAdapter : public Duck {
    Turkey *turkey;

    TurkeyAdapter(Turkey *mturkey) {
        turkey = mturkey;
    }

    virtual quack() {
        turkey->gobble();
    }

    virtual fly() {
        for (int i = 0; i < 5; ++i) {
            turkey->fly();
        }
    }
};


static testDuck(Duck *duck)
{
    duck->quack();
    duck->fly();
}

int main(int argc, char **argv)
{
    MallardDuck *duck = new MallardDuck();

    WildTurkey *turkey = new WildTurkey();
    Duck *turkeyAdapter = new TurkeyAdapter(turkey);

    cout << "The Turkey say..." << endl;
    turkey->gobble();
    turkey->fly();

    cout << "\nThe Duck say..." << endl;
    testDuck(duck);

    cout << "\nThe TurkeyAdapter say..." << endl;
    testDuck(turkeyAdapter);

    return 0;
}