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english/basic_content/c_poly/c++_examp.cpp

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+/**
+ * @file c++_examp.cpp
+ * @brief c++中的多态
+ * @author 光城
+ * @version v1
+ * @date 2019-08-06
+ */
+
+#include <iostream>
+
+using namespace std;
+class A
+{
+    public:
+        virtual void f()//Implement a virtual function
+        {
+            cout << "Base A::f() " << endl;
+        }
+};
+
+class B:public A    // 必须为共有继承，否则后面调用不到，class默认为私有继承！
+{
+    public:
+        virtual void f()//Virtual function implementation, virtual keyword in subclass can not be appearence
+        {
+            cout << "Derived B::f() " << endl;
+        }
+};
+
+
+int main() 
+{
+    A a;//Base class object
+    B b;//an object of derived type
+
+    A* pa = &a;//The parent class pointer points to the parent object
+    pa->f();//Call the function of the parent class
+    pa = &b; //The parent class pointer points to the subclass object, which is implemented in polymorphism
+
+
+    pa->f();//Call the function with the same name of the derived class
+    return 0;
+}