c++-虚析构函数
作者:互联网
虚析构函数
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <fstream>
using namespace std;
class A
{
public:
A() {
cout << "A()..." << endl;
this->p = new char[64];
memset(this->p, 0, 64);
strcpy(this->p, "A String..");
}
virtual void print()
{
cout << "A: " << this->p << endl;
}
virtual ~A() {
cout << "~A()..." << endl;
if (this->p != NULL) {
delete[]this->p;
this->p = NULL;
}
}
private:
char *p;
};
class B :public A
{
public:
B() //此刻会触发A()
{
cout << "B()..." << endl;
this->p = new char[64];
memset(this->p, 0, 64);
strcpy(this->p, "B String..");
}
virtual void print()
{
cout << "B: " << this->p << endl;
}
virtual ~B() {
cout << "~B()..." << endl;
if (this->p != NULL) {
delete[] this->p;
this->p = NULL;
}
}
private:
char *p;
};
void func(A *ap)
{
ap->print();//在此发生多态
}
void deleteFunc(A *ap)
{
delete ap; //此刻ap->~B() //~B() ---> ~A()
}
void test()
{
//A *ap = new A;
//func(ap);
B *bp = new B;
func(bp);
deleteFunc(bp);
}
int main(void)
{
test();
B bObj;
//bObj.~B();
return 0;
}
标签:NULL,函数,void,c++,char,ap,64,include,虚析构 来源: https://www.cnblogs.com/ygjzs/p/12079025.html