[IM]: 简单工厂模式

03.code/18.设计模式/06.简单工厂模式.cpp

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+#include <iostream>
+using namespace std;
+
+// 抽象水果
+class AbstractFruit {
+public:
+    virtual void showName() = 0;
+};
+
+// apple
+class apple : public AbstractFruit {
+public: 
+    virtual void showName()
+    {
+        cout << "apple" << endl;
+    }
+};
+
+// peer
+class peer : public AbstractFruit {
+public: 
+    virtual void showName()
+    {
+        cout << "peer" << endl;
+    }
+};
+
+// banana
+class banana : public AbstractFruit {
+public: 
+    virtual void showName()
+    {
+        cout << "banana" << endl;
+    }
+};
+
+// 工厂
+class FruitFactory {
+public:
+    static AbstractFruit* CreateFruit(const string &flag)
+    {
+        if ("apple" == flag)
+        {
+            return new apple;
+        }
+        else if ("banana" == flag)
+        {
+            return new banana;
+        }
+        else if ("peer" == flag)
+        {
+            return new peer;
+        }
+        else
+        {
+            return NULL;
+        }
+    }
+};
+
+void test01()
+{
+    // 创建的过程不需要关心，直接拿来用
+     FruitFactory *factory = new FruitFactory;
+     AbstractFruit *fruit = factory->CreateFruit("apple");
+     fruit->showName();
+     AbstractFruit *banana = factory->CreateFruit("banana");
+     banana->showName();
+
+     delete fruit;
+     fruit = factory->CreateFruit("peer");
+     fruit->showName();
+     delete factory;
+}
+
+int main()
+{
+   test01();
+
+    return 0;
+}