update

basic_content/abstract/interesting_facts5.cpp

@@ -0,0 +1,30 @@
+
+/**
+ * @file interesting_facts5.cpp
+ * @brief 构造函数不能是虚函数，而析构函数可以是虚析构函数。
+ * 例如：当基类指针指向派生类对象并删除对象时，我们可能希望调用适当的析构函数。如果析构函数不是虚拟的，则只能调用基类析构函数。
+ * @author 光城
+ * @version v1
+ * @date 2019-07-20
+ */
+#include<iostream>
+using namespace std;
+
+class Base  {
+    public:
+        Base()    { cout << "Constructor: Base" << endl; }
+        virtual ~Base()   { cout << "Destructor : Base" << endl; }
+};
+
+class Derived: public Base {
+    public:
+        Derived()   { cout << "Constructor: Derived" << endl; }
+        ~Derived()   { cout << "Destructor : Derived" << endl; }
+};
+
+int main()  {
+    Base *Var = new Derived();
+    delete Var;
+    return 0;
+}
+