C++基础(二十)虚析构函数、纯虚析构函数

话不多说上代码

#include <iostream> using namespace std; class Animal { public: Animal() { cout << "ani的构造器" << endl; } virtual void sayHello() = 0; string* m_name; //第一种写法 虚析构的写法 /* virtual ~Animal() { cout << "ani的析构函数" << endl; } */ //第一种写法 纯虚析构的写法 但这种写法必须提供具体实现 virtual ~Animal() = 0; }; Animal::~Animal() { cout << "ani的析构函数" << endl; }; class Cat :public Animal { public: Cat(string str) { cout << "cat的构造器" << endl; m_name = new string(str); } virtual void sayHello() { cout << *m_name<<"喵喵喵" << endl; } ~Cat() { cout << "cat的析构函数" << endl; if(m_name!=NULL) { delete m_name; m_name = NULL; } } }; void test01() { Animal* ani = new Cat("godv"); ani->sayHello(); delete ani; } int main() { test01(); system("pause"); return 0; }