return CTypedPtrArray object by reference

Question

0.00/5 (No votes)

See more:

i havae created CTypedPtrArray like
CTypedPtrArray<CObArray,COverLayItems*> myArray;

in the document class in MFC where "COverLayItems" is serializable class created by me. Now i need to access this array(myArray) from other classes because it is declared as private i have to write some member functions for getting and setting this array.
please help me for that..
how i can return this myArray by reference...

Thanks in advance

Posted 9-May-11 19:09pm

sandeepnayathil

Updated 9-May-11 19:10pm

v2

Add a Solution

Comments

Albert Holguin 10-May-11 13:33pm

why do you want to return be reference a private array? that has the same effect as making it public (unless you return it as const)

1 solution

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Eugen Podsypalnikov · Answer 1 · 2011-05-09T20:05:00

Solution 1

A possible way :) :

// yours.h

typedef CTypedPtrArray<CObArray,COverLayItems*> CItems;

class C
{
  CItems m_cItems;
..
public:
..
  CItems& GetItems() const { return m_cItems; }
  // const CItems& GetItems() const { return m_cItems; }
..
};

Posted 9-May-11 20:05pm

Eugen Podsypalnikov

Updated 9-May-11 20:12pm

v2

Comments

sandeepnayathil 10-May-11 3:12am

when accessing this get function from other class, i have another error

'CObject::operator =' : cannot access private member declared in class 'CObject'

i added copy constructor and assignment operator overloaded function in my class derived from cobject(ie COverLayItems) but still this problem remains

Eugen Podsypalnikov 10-May-11 3:45am

Please post the code line of the error here :)

sandeepnayathil 10-May-11 4:21am

CImage_ExplorerDoc* doc = (CImage_ExplorerDoc*)pFrame->GetActiveDocument();
// This is an array to store co-ordinate values and other properties of shapes.
CTypedPtrArray <cobarray,coverlayitems*> myArray = doc->GetItems();
// i accessed that getitems() from another class

Eugen Podsypalnikov 10-May-11 4:27am

Please try it :) :
CTypedPtrArray <cobarray,coverlayitems*>& myArrayRef = doc->GetItems();

sandeepnayathil 10-May-11 4:34am

That also not working
'cannot convert CTypedPtrArray<BASE_CLASS,TYPE> to CTypedPtrArray<BASE_CLASS,TYPE>&'

Eugen Podsypalnikov 10-May-11 4:36am

Please post the declaration of the GetItems() function here :)

sandeepnayathil 10-May-11 4:39am

This is the code:
inline const cArrItems& GetArray()const
{
return myArray;
//}
}

Eugen Podsypalnikov 10-May-11 4:41am

Please try to use the last posted function :)

sandeepnayathil 10-May-11 4:47am

still that earlier mentioned error is coming
'CObject::operator =' : cannot access private member declared in class 'CObject'

Eugen Podsypalnikov 10-May-11 4:52am

Please post the both lines now:
- declaration of your function
- usage of your function
We will try to compare them :)

sandeepnayathil 10-May-11 4:55am

typedef CTypedPtrArray<cobarray,coverlayitems*> cArrItems;
cArrItems myArray;
public:
const cArrItems& GetArray() const { return myArray; }

usage:

CFrameWnd* pFrame = (CFrameWnd*)AfxGetMainWnd();
CImage_ExplorerDoc* doc = (CImage_ExplorerDoc*)pFrame->GetActiveDocument();
CTypedPtrArray <cobarray,coverlayitems*> myArray = doc->GetArray();

Eugen Podsypalnikov 10-May-11 5:00am

Just modify your usage like this :) :
const cArrItems& items(doc->GetArray());
Please note, that the const reference does provide the "const" access only.
So you will be not able to call the not const functions on such refernce...

sandeepnayathil 10-May-11 6:37am

what is items in
"const cArrItems& items(doc->GetArray());"

Eugen Podsypalnikov 10-May-11 6:41am

It is a variable, as your array's const-reference :)
It could be written also:
const cArrItems& items = doc->GetArray();

return CTypedPtrArray object by reference

1 solution

Solution 1

Add your solution here

Preview 0

return CTypedPtrArray object by reference

1 solution

Solution 1

Add your solution here

Preview 0

Existing Members

...or Join us