C ++中的虚拟析构函数
使用指向基类的指针删除派生类对象，应使用虚拟析构函数定义基类。
范例程式码
#include<iostream>
using namespace std;
class b {
public:
b() {
cout<<"Constructing base \n";
}
virtual ~b() {
cout<<"Destructing base \n";
}
};
class d: public b {
public:
d() {
cout<<"Constructing derived \n";
}
~d() {
cout<<"Destructing derived \n";
}
};
int main(void) {
d *derived = new d();
b *bptr = derived;
delete bptr;
return 0;
}输出结果
Constructing base Constructing derived Destructing derived Destructing base
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