外观模式.cpp

#include <iostream>
#include <memory>
using namespace std;// 中间层角色，隔离接口，两部分模块通过中间层打交道
// 提供简单接口，不与底层直接打交道
// 提供统一接口，访问子系统中的一群接口
// 定义高层接口，让子系统更容易使用// 迪米特法则
// 一个对象对其他对象的了解应尽可能少，降低对象间耦合，提高系统的可维护性namespace ns1
{class graphic // 图形相关类{graphic(){};graphic(const graphic &tmpobj);graphic &operator=(const graphic &tmpobj);~graphic(){};public:static graphic &getInstance(){static graphic instance;return instance;}public:void display(bool enable) // 是否全屏显示(true：是){cout << "full screen->" << enable << endl;}void effect(bool enable) // 是否开启特效(true：是){cout << "special effects->" << enable << endl;}void resolution(int index) // 设置窗口分辨率{cout << "resolution ratio->" << index << endl;}void antialiasing(bool enable) // 是否开启抗锯齿(true：是){cout << "anti-aliasing->" << enable << endl;}};class sound // 声音相关类{sound(){};sound(const sound &tmpobj);sound &operator=(const sound &tmpobj);~sound(){};public:static sound &getInstance(){static sound instance;return instance;}public:void bgsound(bool enable) // 是否开启背景声音(true：是){cout << "background sound->" << enable << endl;}void envirsound(bool enable) // 是否开启环境音效(true：是){cout << "environmental sound effect->" << enable << endl;}void expsound(bool enable) // 是否开启表情声音(true：是){cout << "expressional voice->" << enable << endl;}void setvolume(int level) // 音量大小设置(0-100){cout << "volume->" << level << endl;}};class chatvoice // 语音聊天相关类{chatvoice(){};chatvoice(const chatvoice &tmpobj);chatvoice &operator=(const chatvoice &tmpobj);~chatvoice(){};public:static chatvoice &getInstance(){static chatvoice instance;return instance;}public:void micvolume(int level) // 麦克风音量大小设置(0-100){cout << "microphone volume->" << level << endl;}void micsens(int level) // 麦克灵敏度设置(0-100){cout << "microphone sensitivity->" << level << endl;}void chatvolume(int level) // 聊天音量设置(0-100){cout << "chat volume->" << level << endl;}};class conffacade // 扮演外观模式角色的类{conffacade(){};conffacade(const conffacade &tmpobj);conffacade &operator=(const conffacade &tmpobj);~conffacade(){};public:static conffacade &getInstance(){static conffacade instance;return instance;}public:void LowConfComputer() // 对于低配置电脑，只开启一些低配置选项{graphic &g_gp = graphic::getInstance();g_gp.display(true); // 全屏耗费资源更低g_gp.effect(false);g_gp.resolution(2);g_gp.antialiasing(false);sound &g_snd = sound::getInstance();g_snd.bgsound(false);g_snd.envirsound(false);g_snd.expsound(false);g_snd.setvolume(15);chatvoice &g_cv = chatvoice::getInstance();g_cv.micvolume(20);g_cv.micsens(50);g_cv.chatvolume(60);}void HighConfComputer() // 对于高配置电脑，能达到最好效果的项全部开启{graphic &g_gp = graphic::getInstance();g_gp.display(false);g_gp.effect(true);g_gp.resolution(0);g_gp.antialiasing(true);sound &g_snd = sound::getInstance();g_snd.bgsound(true);g_snd.envirsound(true);g_snd.expsound(true);g_snd.setvolume(50);chatvoice &g_cv = chatvoice::getInstance();g_cv.micvolume(100);g_cv.micsens(100);g_cv.chatvolume(100);}};
}namespace ns2
{class Screen // 屏幕{public:void On() { cout << "screen on!" << endl; }void Off() { cout << "screen off!" << endl; }};class Light // 灯光{public:void On() { cout << "light open!" << endl; }void Off() { cout << "light close!" << endl; }};class Speaker // 音箱{public:void On() { cout << "speaker on!" << endl; }void Off() { cout << "speaker off!" << endl; }};class DvdPlayer // DVD播放器{public:void On() { cout << "dvd open!" << endl; }void Off() { cout << "dvd close!" << endl; }};class PlayerStation // 游戏机{public:void On() { cout << "playerstation on!" << endl; }void Off() { cout << "playerstation off!" << endl; }};class HomeTheaterFacade // 家庭影院外观模式类{Screen scnobj;Light lgobj;Speaker spkobj;DvdPlayer dpobj;PlayerStation psobj;public:void WatchMovie() // 看电影{// 屏幕打开，灯光熄灭，音箱打开，DVD播放器打开，游戏机关闭。scnobj.On();lgobj.Off();spkobj.On();dpobj.On();psobj.Off();}void PlayGame() // 玩游戏{// 屏幕打开，灯光打开，音箱打开，DVD播放器关闭，游戏机打开。scnobj.On();lgobj.On();spkobj.On();dpobj.Off();psobj.On();}};
}namespace ns3
{class Shape{public:virtual ~Shape() = default;virtual void draw() const = 0;};class Rectangle : public Shape{public:void draw() const override { cout << "Rectangle::draw()" << endl; }};class Square : public Shape{public:void draw() const override { cout << "Square::draw()" << endl; }};class Circle : public Shape{public:void draw() const override { cout << "Circle::draw()" << endl; }};class ShapeMaker{shared_ptr<Shape> circle;shared_ptr<Shape> rectangle;shared_ptr<Shape> square;public:ShapeMaker(){circle = make_shared<Circle>();rectangle = make_shared<Rectangle>();square = make_shared<Square>();}void drawCircle() const { circle->draw(); }void drawRectangle() const { rectangle->draw(); }void drawSquare() const { square->draw(); }};
}int main()
{
#if 0using namespace ns1;graphic &g_gp = graphic::getInstance();g_gp.display(false);g_gp.effect(true);g_gp.resolution(2);g_gp.antialiasing(false);cout << "---------------" << endl;sound &g_snd = sound::getInstance();g_snd.setvolume(80);g_snd.envirsound(true);g_snd.bgsound(false);cout << "---------------" << endl;chatvoice &g_cv = chatvoice::getInstance();g_cv.chatvolume(70);g_cv.micsens(65);
#endif#if 0using namespace ns1;conffacade &g_cffde = conffacade::getInstance();cout << "Low-configuration computer" << endl;g_cffde.LowConfComputer();cout << "------------------" << endl;cout << "high-configuration computer" << endl;g_cffde.HighConfComputer();
#endif#if 0ns2::HomeTheaterFacade htfacobj;cout << "movie---------------" << endl;htfacobj.WatchMovie();cout << "game---------------" << endl;htfacobj.PlayGame();
#endif#if 1using namespace ns3;shared_ptr<ShapeMaker> shapeMaker(new ShapeMaker());shapeMaker->drawCircle();shapeMaker->drawRectangle();shapeMaker->drawSquare();
#endifcout << "Over!\n";return 0;
}