設計模式《八》——適配器模式

簡介

適配器模式將某個類的接口轉換成客戶端期望的另一個接口表示，目的是消除由於接口不匹配所造成的類的兼容性問題。主要分爲三類：類的適配器模式、對象的適配器模式、接口的適配器模式。

角色與職責

 

實例

#include <iostream>
#include <string>
using namespace std;
class Current18v {
public:
    virtual void usrCurrent18v() = 0;
};
class Current220v {
public:
    void usrCurrent220v() {
        cout << "I'm 220v, Wellcom to use." << endl;
    }
};
class Adapter : public Current18v {
public:
    Adapter(Current220v* current) {
        m_current = current;
    }
    virtual void usrCurrent18v() {
        cout << "Adapter: adaptive 18v to 220V" << endl;
        m_current->usrCurrent220v();
    }
private:
    Current220v* m_current;
};
int main(int argc, char* argv[]) {
    Current220v* current220v = new Current220v;
    Adapter* adapter = new Adapter(current220v);
    adapter->usrCurrent18v(); // we have 220v. but client use 18V
    delete current220v;
    delete adapter;
    cin.get();
    return 0;
}