基类与派生类的调用

最新推荐文章于 2024-04-28 22:27:05 发布

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本文探讨了 C++ 中的继承与析构函数的调用顺序，通过实例展示了当基类的析构函数为虚函数时，派生类的析构函数能够被正确调用的过程。同时，对比了非虚析构函数情况下，析构函数调用的差异。

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定义时看的是等号右边的，析构时看的是等号左边的(析构函数不是虚函数时)

#include <bits/stdc++.h>
using namespace std;
#define MAXX 10005
#define MODD 1000000007
#define LL long long
#define mem(a, b) memset(a, b, sizeof(a));

class A
{
public:
    A()  {   cout << "A" << endl;  }
    ~A() {    cout<<"~A"<<endl;   }
};

class B:public A
{
    public:
        B()
        {
            cout << "B" << endl;
        }
        ~B()
        {
            cout<<"~B"<<endl;
        }
    };

int main(void)
 {
        A *pa = (A*)new B();
        cout << "YES" << endl;
        B *pb = (B*)new A();
        delete pa;
        cout << "YES" << endl;
        delete pb;

        A *pca = new A();
        cout << "YES" << endl;
        B *pcb = new B();
        delete pca;
        cout << "YES" << endl;
        delete pcb;
        return 0;
}

#include <bits/stdc++.h>
using namespace std;
#define MAXX 10005
#define MODD 1000000007
#define LL long long
#define mem(a, b) memset(a, b, sizeof(a));
static int ss = 0;



class A
{
public:
    static int s ;
    A()  { cout << "A" << endl;  }
    virtual ~A() {    cout<<"~A"<<endl;   }
};

class B:public A
{
    public:
        B()
        {
            cout << "B" << endl;
        }
        virtual ~B()
        {
            cout<<"~B"<<endl;
        }
};
int A::s = 5;

int main(void)
 {
        A *pa = (A*)new B();
        cout << "YES" << endl;
        B *pb = (B*)new A();
       // cout << A::s << endl;

        cout << pa->s << endl;
        delete pa;
        cout << "YES" << endl;
        delete pb;

        A *pca = new A();
        cout << "YES" << endl;
        B *pcb = new B();
        delete pca;
        cout << "YES" << endl;
        delete pcb;
        return 0;
}