What's the error in compiling const iterator

Question

Please refer code below:

Can anyone suggest how to remove the errors ?
https://code.sololearn.com/c2pTQZJ1I4NE/?ref=app

Answer 1

It's not an error because the const_iterator returns a 'Test* const', not a 'const Test*'.
Which is pretty much the same as if you return const int from a function, as in you can still assign it to a non const int.

If you want it to be const either have a container of 'const Test*' objects or explicitly add const on line 32.

Answer 2

Thanks Brian nd Dennis

Answer 3

The first error seems to get corrected if I change line 40 from

itr->display();

To

(*itr)->display();

After that, errors are due to attempts to access freed and then nulled object pointers.

Answer 4

Thanks Brian

That's correct.. when I solve the *itr issue, I am getting memory dump error.

If I have taken const iterator in first for loop and passing pointer by reference to

trial(p);

Should not it be a compile time error ?

why error : bcz const iterator should not allow modification but passing it by reference does not guarantee no modification