Hi everyone..
How can i delete a pointer in a member function which return that pointer
for example:
I hope you answer meCode:Node<T>* Rpointer(T item) { Node<T> *t11; t11=head; while( t11 != NULL && t11->data != item) { t11=t11->next; } if(t11==NULL) { cout<<"Not Found"; delete t11; return 0; } return t11; }
Are you sure you should delete the pointer? Because you're deleting "head"; which isn't allocated in this function.
If you're sure, simply write "delete ptr;", where ptr is the pointer you want to delete. What exactly are you having trouble with?
The trouble is where can i type delete ptr
after return t11 or before it??
I think the both cases are wrong, I tried in the second case but the program hung maybe because it delete the ptr then retutn it...?
Last edited by almawajdeh; 11-23-2010 at 11:06 AM.
It is definitely wrong to delete t11 after the return statement since that statement would then be unreachable. It would definitely be wrong to delete t11 just before the return statement since the caller would then be returned a pointer to an object that no longer exists.Originally Posted by almawajdeh
What is this member function supposed to do? I gather that it is supposed to find an object that is equal to item. Perhaps what you want to do is to save a pointer to the next element, then delete t11, and then cause t11 to point to that next element so as to return t11.
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After outputting Not Found, there is no point in deleting t11 because you only output that if t11 is NULL, therefore it would always be doing delete NULL, which is pointless.
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Linus Torvalds: "But it clearly is the only right way. The fact that everybody else does it some other way only means that they are wrong"
So, what is the solution?
I didn't understand what laserlight meant
and thanks iMalc for the note
But, Do we have to delete the static pointers or the deletion for Dynamic pointers only?
Last edited by almawajdeh; 11-25-2010 at 04:23 PM.
You only have to/are allowed to delete pointers that are dynamically allocated with new.
