🙄 适配器模式(Adapter模式)

使用场景通常为，我们因为任务已经写好了接口，但是拿来了一个第三方库，接口并不相同，则在中间可以有一个适配器进行过渡，适配器可以采用继承或者组合的方式进行实现

继承方式

//适配器模式 多继承方式
#include<iostream>
using namespace std;

//原先我们的程序很久以前就在使用的接口
class MyInterface {
public:
    enum exe_type{
        CALL,
        REQUEST
    };
    virtual void exe(exe_type)=0;
    MyInterface() = default;
    virtual ~MyInterface();
};

MyInterface::~MyInterface() {

}

//最新找来的第三方库
class ThreePart {
public:
    void call();
    void request();
};


void ThreePart::call() {
    cout << "call" << endl;
}

void ThreePart::request() {
    cout << "request" << endl;
}


//编写适配器
class Adapter:public ThreePart,public MyInterface {
public:
    virtual void exe(exe_type type);
};

void Adapter::exe(exe_type type) {
    switch (type)
    {
    case MyInterface::CALL:
        call();
        break;
    case MyInterface::REQUEST:
        request();
        break;
    default:
        break;
    }
}

int main() {
    MyInterface* api = new Adapter;
    api->exe(MyInterface::CALL);//call
    api->exe(MyInterface::REQUEST);//request
    delete api;
    return 0;
}

组合方式

//适配器模式 组合方式
#include<iostream>
using namespace std;

//原先我们的程序很久以前就在使用的接口
class MyInterface {
public:
    enum exe_type{
        CALL,
        REQUEST
    };
    virtual void exe(exe_type)=0;
    MyInterface() = default;
    virtual ~MyInterface();
};

MyInterface::~MyInterface() {

}

//最新找来的第三方库
class ThreePart {
public:
    void call();
    void request();
};


void ThreePart::call() {
    cout << "call" << endl;
}

void ThreePart::request() {
    cout << "request" << endl;
}

//编写适配器
class Adapter:public MyInterface {
public:
    Adapter(ThreePart *threePart);
    virtual void exe(exe_type type);
private:
    ThreePart* threePart;
    ~Adapter();
};

Adapter::Adapter(ThreePart*threePart):threePart(threePart) {
}

Adapter::~Adapter() {
    delete threePart;
}

void Adapter::exe(exe_type type) {
    switch (type)
    {
    case MyInterface::CALL:
        threePart->call();
        break;
    case MyInterface::REQUEST:
        threePart->request();
        break;
    default:
        break;
    }
}

int main() {
    MyInterface* api = new Adapter(new ThreePart);
    api->exe(MyInterface::CALL);//call
    api->exe(MyInterface::REQUEST);//request
    delete api;
    return 0;
}