門面模式是比較常用的一種設計模式，我們可能在無意中就會使用，門面模式就是用一個門面類來處理子系統的復雜關系，門面類簡單的Api接口供客戶端調用。用一個簡單的演播室來表示。

#include <iostream> using namespace std;//class Camera; //class Light; //class Screen; class Camera { public:Camera(){}~Camera(){}void TrunOn(){cout << "攝像機打開!" << endl;}void TrunOff(){cout << "攝像機關閉!" << endl;}void Rotate(int degrees){cout << "Rotate the camera by "<<degrees<< "degrees!" <<endl;} };class Light { public:Light(){}~Light(){}void TrunOn(){cout << "燈光打開!" << endl;}void TrunOff(){cout << "燈光關閉!" << endl;} };class Screen { public:Screen(){}~Screen(){}void TrunOn(){cout << "顯示器打開!" << endl;}void TrunOff(){cout << "顯示器關閉!" << endl;} };class Facade { public:Facade(){m_camera = new Camera();m_lights = new Light();m_Screen = new Screen();}~Facade(){delete m_camera;delete m_lights;delete m_Screen;}void Activate(){cout<< "激活設備開始直播!"<<endl;m_camera->TrunOn();m_camera->Rotate(90);m_lights->TrunOn();m_Screen->TrunOn();}void Deactivate(){cout << "關閉設備!" << endl;m_camera->TrunOff();m_camera->Rotate(0);m_lights->TrunOff();m_Screen->TrunOff();}private:Camera *m_camera;Light *m_lights;Screen *m_Screen; };

主函數：

int main() {Facade * m_facade = new Facade();m_facade->Activate();std::cout << "直播中!" << std::endl;m_facade->Deactivate();getchar();return 0; }

輸出結果：

激活設備開始直播! 攝像機打開! Rotate the camera by 90degrees! 燈光打開! 顯示器打開! 直播中! 關閉設備! 攝像機關閉! Rotate the camera by 0degrees! 燈光關閉! 顯示器關閉!

如果不使用門面類的話，每一個客戶端都要直接去調用設備，會客戶端的代碼很復雜。可讀性差。

轉載于:https://www.cnblogs.com/onlycxue/p/3429179.html

總結

以上是生活随笔為你收集整理的c++ 门面模式(Facade)的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。