MFC CView* delete question

[nio82]

Hello,

I would to ask about a pointer deletion problem.

I'm developing a SDI multiview application with MFC and I'm using to access at a view class from a child dialog.
To do this I'm using a casting in this way:

CView* v = ((CFrameWnd*) m_pMainWnd)->GetActiveView();

((MyView*)v)->MyFunction_in_Parent();


When I exit method must I delete *v pointer? Or set to null?
Any not CView pointer deletion will bring problems?

Thank you



Thank you

[guestgulkan]

No on the delete - as you did not create the object at *v. It was already there - all you have done
is to get the address of it.


You could set the v pointer to NULL (v = NULL) - all depends on what you are
going to do with it next.

[nio82]

I understand.
At last I want to delete that pointer, so I must just set it to NULL?

[coder777]

nio82 wrote:

When I exit method must I delete *v pointer? Or set to null?

Neither. v is a local variable that's not longer accessible after leaving scope (function) hence it makes no sense to assign null when it's not longer existent.

Imporant is that only that object that has the ownership of the pointer (called new) is supposed to call delete.

better use dynamic_cast<...*> so that you know that the object has the right type. dynamic_cast returns null if it's the wrong type