init commit

archive/design pattern/factory/simple.cpp

@@ -0,0 +1,52 @@
+#include <iostream>
+#include <string>
+
+class Graph
+{
+public:
+    virtual void show() = 0;
+};
+
+class Triangle : public Graph
+{
+public:
+    void show()
+    {
+        std::cout << "三角形" << std::endl;
+    }
+};
+
+class Round : public Graph
+{
+public:
+    void show()
+    {
+        std::cout << "圆形" << std::endl;
+    }
+};
+
+class GraphFactory
+{
+public:
+    static Graph *CreateGraph(std::string name)
+    {
+        if (name == "triangle")
+        {
+            return new Triangle();
+        }
+        else if (name == "round")
+        {
+            return new Round();
+        }
+        return NULL;
+    }
+};
+
+int main()
+{
+    Graph *a = GraphFactory::CreateGraph("triangle");
+    a->show();
+    a = GraphFactory::CreateGraph("round");
+    a->show();
+    return 0;
+}