Initialisation of constructors using class, pointers, etc., using member initialisation lists

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Hi,

In my Dialog based MFC application, I have the below error w.r.t Constructor, even though multiple changes made in order, and types of params, the error w.r.t constructor still exists,

//Dialog.h

C#

class CDlgMac : public CDialog
{
// Construction
public:
//  CDlgMac (CMac*,CWrkShp*,CWnd* pParent = NULL);   // standard constructor -> Scenario-I sucessfully builds with no errors.
CDlgMac (CMac*,CWrkShp*,CPtrList& ,CJoe&,CWnd* pParent = NULL); //stand

-> Scenario -II on including Class Joe and Pointer in Constructor the error is depicted.

C#

CJoe& m_Opt;
    CPtrList& m_Obj;

In Dialog.cpp

//Adding CNewClass header file here.
#include "NewClass.h"

Scenario-I:

//CDlgMac ::CDlgMac (CMachine* pMachine,CWrkshp* pWkshp,CWnd* pParent /*=NULL*/)
// : CDialog(CDlgMac ::IDD, pParent), m_pMachine(pMachine),m_pWorkShop(pWorkShop)
{
//{{AFX_DATA_INIT(CDlgMac )
// NOTE: the ClassWizard will add member initialization here
// //}}AFX_DATA_INIT
}
Scenario-II:

C#

CDlgMac::CDlgMac(CMac* pMac,CWrkShp* pWrkShp,CPtrList& ObjectLst,CJoe& OptPage2 ,CWnd* pParent /*=NULL*/)
    : CDialog(CDlgMac::IDD, pParent), m_pMac(pMac),m_pWrkShp(pWrkShp),m_Obj(ObjectLst),m_Opt(OptPage2)
{
    //{{AFX_DATA_INIT(CDlgMac)
        // NOTE: the ClassWizard will add member initialization here
      //}}AFX_DATA_INIT
}

....
....

In OtherFile James.cpp

I invoke the following code,
...
...
CDlgMac dlg(pMac,m_pParent->GetWork(),NULL); ----> Error shown in this line

On build, I get the following errors,
1>error C2664: 'CDlgMac::CDlgMac(CMac *,CWrkShp *,CPtrList &,CJoe &,CWnd *)' : cannot convert parameter 3 from 'int' to 'CPtrList &'

Basically, my target is to initialize all the variables/datamembers using member initialisation lists, using pointer and class(reference).

Any help in resolving the above would be much appreciable.,
I am using VS2008IDE, MFC 9.0v.

With Regards,
VishalK

Posted 27-Jul-12 3:12am

Vishalk_92

Updated 27-Jul-12 3:26am

v3

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CPallini · Answer 1 · 2012-07-27T03:30:00

Solution 1

The compiler, of course is right. You cannot initialise a reference (PtrList& ObjectLst) with NULL.

Posted 27-Jul-12 3:30am

CPallini

Argonia · Answer 2 · 2012-07-27T03:36:00

The problem raises in the definition of the class CPtrList in list_p.cpp

C++

CPtrList::CPtrList(INT_PTR nBlockSize)
{
	ASSERT(nBlockSize > 0);

	m_nCount = 0;
	m_pNodeHead = m_pNodeTail = m_pNodeFree = NULL;
	m_pBlocks = NULL;
	m_nBlockSize = nBlockSize;
}

You can clearly see you cant give a value NULL to a variable of type CPtrList
Please see CObList::CObList
I know its information about other constructor but this class its almoust indentical to the CPtrList and in msdn this clas isnt documented well

CPtrList Class
I hope this information helps you