Why pointer not getting set to nullptr after delete?

Question

class A{
public:
void foo() {
cout << 1;
}
};

int main() {
A* obj = new A;
delete obj;
obj = nullptr; //obj = NULL
obj->foo(); //Output: 1
return 0;
}

https://code.sololearn.com/c99ntKkoGOPR/?ref=app

Answer 1

It is, but C++ doesn't care if you don't. C++ doesn't protect you from coding junk. A::foo(nullptr) can be called to output 1 as this wasn't used. Try accessing a property and a zero address would likely crash the program. But, that is OS dependent. It could just as easily work.

Answer 2

Just a record of me asking the same problem a year ago.

https://www.sololearn.com/discuss/541715/?ref=app

Answer 3

@John Wells, you are right, I can not access a property. Thank you
Image demonstration:
https://drive.google.com/file/d/1dV6gT3w3FhCYANjP0Ub9c3z0QRuEV-Lv