在调用析构函数后使用对象 [英] using an object after it's destructor is called

问题描述

可能重复：

可以在其范围之外访问本地变量的内存？

代码：

#include <iostream>
using namespace std;

class B{
    public:
    int b;
    B():b(1){}
    ~B(){cout << "Destructor ~B() " << endl;}
};

class A{
    public:
    B ob;
    A()try{throw 4;}
    catch(...){cout << "Catched in A() handler : ob.b= " << ob.b<<endl;}
};




int main()try{
A t;


}
catch(...){cout << "CATCHED in Main" <<  endl;}

输出：

Destructor ~B() 
Catched in A() handler : ob.b= 1
CATCHED in Main

我的问题是如何访问成员变量 b

My Question is how it's possible to access a member variable b of an object ob that its destructor call finished.

推荐答案

因为它的析构函数调用完成了一个对象 ob 当对象被破坏时，它占用的实际内存仍然存在。但是，这是未定义的行为，可能或可能无法正常工作。

Because while the object has been destroyed, the actual memory that it occupied still exists. However, it's undefined behavior, and may or may not work.

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