Hey, why does this: int main() { auto

Question

Hey, why does this: int main() { auto

x = new int(8);
cout << *x << endl;
delete x;
auto y = new int(7);
cout << *x << endl;
*x = 3;
cout << *x << endl;
cout << *y << endl;
delete y;
}
Produce the following output:
8
7
3
3
On almost every system?

0

24.04.2021

4 ответов

22 просмотра

Ghasem Ramezani

This is UB.

0

24.04.2021

Nils Автор вопроса

swapping that delete/new in lines 4/5 causes different (just as much) undefined behavior

0

24.04.2021

Alejandro

run that -D or other optimization/debug configurations. You will see a lot of fun

0

24.04.2021

Cengizhan Pasaoglu · Accepted Answer

Cengizhan Pasaoglu

This is undefined behavior. Almost every system, x only deleted or marked as not used by program anymore but address is still valid on program space.

0

24.04.2021

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