Re: Heap stack Class questons

From:

Oliver Regenfelder <oliver.regenfelder@gmx.at>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 02 Jun 2010 18:26:51 +0200

Message-ID:

<c2e2f$4c068651$5477403e$28724@news.inode.at>

Hello,

RB wrote:

I have the following confusions on Class creation. It appears
from macro expansion and stepping thru the framework calls
that the DocTemplate which holds the original Doc/View members
are created as nameless object instances referenced with a ptr
on the heap, correct ?
// eg:
CSingleDocTemplate* pDocTemplate;
pDocTemplate = new CSingleDocTemplate(
  IDR_MAINFRAME,
  RUNTIME_CLASS(CFileHandlingDoc),
  RUNTIME_CLASS(CMainFrame),
  RUNTIME_CLASS(CFileHandlingView));
AddDocTemplate(pDocTemplate);

// So if I derive a class as say,
MyClass::MFC_BaseClassWhatever
{ int Whatever = 1;
     MyClass() {}
   ~MyClass() {}
};
class CFileHandlingDoc : public CDocument
{
    protected:
    CFileHandlingDoc();
    DECLARE_DYNCREATE(CFileHandlingDoc)
   MyClass MyClassObj;
   ///------rest of class
// is MyClassObj here, created on the heap or the stack ?

It depends on where your CFileHAndlingDoc object is created.
If the CFileHandlingDoc object is on the stack then the MyClass
object will be on the stack.

// And finally am I correct in ascertaining that as long as I don't
// actually create a class (or anything ) using
WhateverType* pWhatever = new WhateverType;
// then I don't have to worry about
delete pWhatever; // in the destructor or where ever
// correct ??

Yes.
If you create objects dynamically you should use smart pointers so
you don't have to think about the delete.

Best regards,

Oliver