How is this working fine?

Question

How is my below program working fine???
https://code.sololearn.com/cWbo3mPUh4Ho/?ref=app

Answer 1

The code will break as soon as you dereference (and use) 'this' (nullptr)

That means accessing the variable '_i', making the method virtual, or simply doing '*this'

The reason it works is because under the hood you're calling
Foo::f(p)

And while you do dereference nullptr doing p->, you're not actually "using" it

Answer 2

Angelo
I understand that in my case I'm not dereferencing the NULL pointer. But how come the compiler doesn't notice it? Or is there some kind of "hack" going on here?

Answer 3

Rishi the compiler won't notice because it's not its job

What the nullptr is pointing to is indeed a Foo object, because you said it is