Re: "operator=" overloading for CDialog

From:
David Wilkinson <no-reply@effisols.com>
Newsgroups:
microsoft.public.vc.language
Date:
Sun, 16 Mar 2008 20:49:11 -0400
Message-ID:
<#Muz3i8hIHA.4076@TK2MSFTNGP05.phx.gbl>
runcyclexcski@gmail.com wrote:

Hi all,

I am not a programmer, so I apologize in advance for my ignorance.

In my app (MFC 2003.NOT) I have a main dialog from which I create N
secondary MyDIalogs windows.
N is defined based on the result of a calculation that the app makes,
so the N MyDialog windows have to be allocated in memory and Create()d
on the fly. So when the calculation is done I allocate an array of N
CMyDIalog class instances using a 'new' operator and populate this
array using the opreator= assignment.

The problem is that I have to define the "operator=" myself in the
MyDialog class, and my simple brain can't grasp how to do that. Can
anyone help, please? Here is a snipped version of my 'code'

//MyDialog.h

class CMyDialog : public CDialog {
        <snip>
    operator=(CMyDialog &pointer);//OK
        <snip>
};

//MyDialog.cpp

CMyDialog ::operator=( CMyDialog &pointer )
{
<???>return...//what do I put here???
}

//MainDialog.h

#include "MyDIalog.h"
CMyDialog * ManyMyDialogs;

//MainDIalog.cpp

ManyMyDialogs = new CMyDialog [N];
for (int i=0;i<N;i++) {
CMyDialog CurrentDIalog;
ManyMyDialogs[0] = CurrentDIalog;//generates a "operator=" not defined
error
}
<snip>
delete [] ManyMyDialogs;// when done


runcy:

Classes derived from CWnd are not copyable. You need to create each dialog
separately

CMyDialog* myDialogs = new CMyDialog[N];
for (int i=0; i<N; i++)
{
   myDialogs[i].Create(....);
}

delete [] myDialogs;

There may be other problems with the above ...

--
David Wilkinson
Visual C++ MVP

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