添加设计模式及例子，包括：单例、抽象工厂、适配器、桥接、观察者模式

DesignPattern/ObserverPattern/ObserverMain.cpp

@@ -0,0 +1,34 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#include "ObserverMain.h"
+
+void ObserverMain()
+{
+    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    ConcreteSubject * pSubject = new ConcreteSubject();
+
+    // <20><><EFBFBD><EFBFBD><EFBFBD>۲<EFBFBD><DBB2><EFBFBD>
+    IObserver * pObserver1 = new ConcreteObserver("Jack Ma");
+    IObserver * pObserver2 = new ConcreteObserver("Pony");
+
+    // ע<><D7A2><EFBFBD>۲<EFBFBD><DBB2><EFBFBD>
+    pSubject->Attach(pObserver1);
+    pSubject->Attach(pObserver2);
+
+    // <20><><EFBFBD>ļ۸񣬲<DBB8>֪ͨ<CDA8>۲<EFBFBD><DBB2><EFBFBD>
+    pSubject->SetPrice(12.5);
+    pSubject->Notify();
+
+    // ע<><D7A2>һ<EFBFBD><D2BB><EFBFBD>۲<EFBFBD><DBB2><EFBFBD>
+    pSubject->Detach(pObserver2);
+
+    // <20>ٴθ<D9B4><CEB8><EFBFBD>״̬<D7B4><CCAC><EFBFBD><EFBFBD>֪ͨ<CDA8>۲<EFBFBD><DBB2><EFBFBD>
+    pSubject->SetPrice(15.0);
+    pSubject->Notify();
+
+    SAFE_DELETE(pObserver1);
+    SAFE_DELETE(pObserver2);
+    SAFE_DELETE(pSubject);
+}

DesignPattern/ObserverPattern/ObserverMain.h

@@ -0,0 +1,17 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_OBSERVERMAIN_H
+#define DESIGNPATTERN_OBSERVERMAIN_H
+
+#include "concrete_subject.h"
+#include "concrete_observer.h"
+
+#ifndef SAFE_DELETE
+#define SAFE_DELETE(p) { if(p){delete(p); (p)=nullptr;} }
+#endif
+
+void ObserverMain();
+
+#endif //DESIGNPATTERN_OBSERVERMAIN_H

DesignPattern/ObserverPattern/concrete_observer.h

@@ -0,0 +1,25 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_CONCRETE_OBSERVER_H
+#define DESIGNPATTERN_CONCRETE_OBSERVER_H
+
+#include "observer.h"
+#include <iostream>
+#include <string>
+
+class ConcreteObserver : public IObserver
+{
+public:
+    ConcreteObserver(std::string name) { m_strName = name; }
+    void Update(float price)
+    {
+        std::cout << m_strName << " - price" << price << "\n";
+    }
+
+private:
+    std::string m_strName;  // 名字
+};
+
+#endif //DESIGNPATTERN_CONCRETE_OBSERVER_H

DesignPattern/ObserverPattern/concrete_subject.h

@@ -0,0 +1,45 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_CONCRETE_SUBJECT_H
+#define DESIGNPATTERN_CONCRETE_SUBJECT_H
+
+#include "subject.h"
+#include "observer.h"
+#include <iostream>
+#include <list>
+
+// 具体主题
+class  ConcreteSubject : public ISubject
+{
+public:
+    ConcreteSubject(){ m_fPrice = 10.0; }
+    void SetPrice(float price)
+    {
+        m_fPrice = price;
+    }
+    void Attach(IObserver * observer)
+    {
+        m_observers.push_back(observer);
+    }
+    void Detach(IObserver * observer)
+    {
+        m_observers.remove(observer);
+    }
+    // 通知所有观察者
+    void Notify()
+    {
+        std::list<IObserver *>::iterator it = m_observers.begin();
+        while (it != m_observers.end())
+        {
+            (*it)->Update(m_fPrice);
+            ++it;
+        }
+    }
+private:
+    std::list<IObserver *> m_observers; // 观察者列表
+    float m_fPrice;                     // 价格
+};
+
+#endif //DESIGNPATTERN_CONCRETE_SUBJECT_H

DesignPattern/ObserverPattern/observer.h

@@ -0,0 +1,15 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_OBSERVER_H
+#define DESIGNPATTERN_OBSERVER_H
+
+// 抽象观察者
+class IObserver
+{
+public:
+    virtual void Update(float price) = 0;   // 更新价格
+};
+
+#endif //DESIGNPATTERN_OBSERVER_H

DesignPattern/ObserverPattern/subject.h

@@ -0,0 +1,18 @@
+//
+// Created by xiemenghui on 2018/7/21.
+//
+
+#ifndef DESIGNPATTERN_SUBJECT_H
+#define DESIGNPATTERN_SUBJECT_H
+
+class IObserver;
+
+class ISubject
+{
+public:
+    virtual void Attach(IObserver *) = 0;   // 注册观察者
+    virtual void Detach(IObserver *) = 0;   // 注销观察者
+    virtual void Notify() = 0;              // 通知观察者
+};
+
+#endif //DESIGNPATTERN_SUBJECT_H