Compiler Error : error C2248

Question

 error C2248: 'CObject::operator =' : cannot access private member declare class 'CObject'
     S:\MedCom\extern\i586-WinNT5.01\Microsoft Visual Studio\VC\atlmfc\include\afx.h(552) : see declaration of 'CObject::operator ='
     S:\MedCom\extern\i586-WinNT5.01\Microsoft Visual Studio\VC\atlmfc\include\afx.h(522) : see declaration of 'CObject'
     This diagnostic occurred in the compiler generated function 'CArray<TYPE,ARG_TYPE> &CArray<TYPE,ARG_TYPE>::operator =(const CArray<TYPE,ARG_TYPE> &)'

I am not able to compile this code in VC9 which was working fine in VC6.

Code:

Class XYZ
{
private:
CArray<Cap3dStringDataTag,Cap3dStringDataTag&> myTagList;
}
Please help me find whats wrong in this.

Regards,
Krishna

Answer 1

This is because in your code some where you might be assigning an object of XYZ to another object of XYZ.

Either you have to remove the assignment of object or write your own =operator for this class.

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Nave [My Blog]

Answer 2

If the code was working in VC6 then it's possible you are being affected
by one of the many changes made from VC6 up to VC9. Each new version
usually has changes which may break existing code. You need to read
carefully the documentation on "Breaking Changes" for each new release:

Breaking Changes in Visual C++ .NET 2003

The Visual C++ compiler has significantly increased its conformance
with the C++ standard in the Visual Studio .NET 2003 release. With
this conformance comes a number of breaking changes. Many of those
changes now result in compiler errors, where no compiler errors were
given in previous releases. However, there are also a number of silent,
or runtime errors, which are described in this section.

http://msdn.microsoft.com/en-us/library/ms177251.aspx



Breaking Changes in the Visual C++ 2005 Compiler

This topic discusses the behavior changes in Visual C++ 2005
that can cause code that worked in a previous release to
either not compile, or to behave differently at run time.

http://msdn.microsoft.com/en-us/library/ms177253.aspx



Breaking Changes

This topic lists the breaking changes in Visual C++ 2008.

http://msdn.microsoft.com/en-us/library/bb531344.aspx

- Wayne

Answer 3

Hi Krishna,

 

Please refer to this article with link:

 

http://msdn.microsoft.com/en-us/library/ccb3dh5c.aspx

 

As this article says：the reason for the compiler errors is that CObject declares a private copy constructor and assignment operator in the AFX.h file. Consequently, the compiler does not generate a default copy constructor and assignment operator for the CObject-derived class. Because the compiler does not find these functions declared in the class, it reports the errors.

 

To avoid the compiler errors, you need to implement a copy constructor and assignment operator for the CObject-derived class. This is illustrated in the sample code below. You can avoid the errors by uncommenting the lines indicated in the sample code.

 

Best Regards,

Nancy

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