update

basic_content/virtual/set3/full_virde.cpp

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+/**
+ * @file full_virde.cpp
+ * @brief 将基类的析构函数声明为虚函数
+ * 输出结果：
+ *      Constructing base
+ *      Constructing derived
+ *      Destructing derived
+ *      Destructing base
+ * @author 光城
+ * @version v1
+ * @date 2019-07-24
+ */
+#include<iostream> 
+
+using namespace std; 
+
+class base { 
+    public: 
+        base()      
+        { cout<<"Constructing base \n"; } 
+        virtual ~base() 
+        { cout<<"Destructing base \n"; }      
+}; 
+
+class derived: public base { 
+    public: 
+        derived()      
+        { cout<<"Constructing derived \n"; } 
+        ~derived() 
+        { cout<<"Destructing derived \n"; } 
+}; 
+
+int main(void) 
+{ 
+    derived *d = new derived();   
+    base *b = d; 
+    delete b; 
+    return 0; 
+}