【C++ Primer 第15章】定义派生类析构函数

学习资料

• 基类和派生类析构函数执行顺序

定义派生类析构函数

【注意】定义一个对象时先调用基类的构造函数、然后调用派生类的构造函数；析构的时候恰好相反：先调用派生类的析构函数、然后调用基类的析构函数。

 #include <iostream>
 using namespace std;

 class Base
 {
 public:
     Base()
     {
         cout << "Base contruction" << endl;
     }
     virtual ~Base()
     {
         cout << "Base deconstruction" << endl;
     }

 };

 class Derived : public Base
 {
 public:
     Derived(int i)
     {
         num = i;
         cout << "Derived contruction " << num << endl;
     }
     virtual ~Derived()
     {
         cout << "Derived deconstruction" << num << endl;
     }
 private:
     int num;
 };

 int main()
 {
     Derived derived();

     Base* basePtr;
     basePtr = new Derived();
     delete basePtr;
 }

输出结果：