compiler generated function

[David Crow]

sheetal_06 wrote:

class CPtrArray : public CObject { //does not implement operator= }

I'm curious how you got this to compile in VC++ v6 since CPtrArray is an existing MFC class, and the class is missing a semicolon. :confused:

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[prasad_som]

Probably, he is showing the declaration in header. Atleast I assumed it, while giving replies.

Prasad Notifier using ATL | Operator new[],delete[][^]

[Mark Salsbery]

I've answered this several times for you. You HAVE to have an assignment operator for CObject derived classes if they are to be used in a container. Why not just implement the operator in your class?

[sheetal_06]

I have implemented operator= in CCasObject and in CSpanLoad.But operator= is not there in CPtrArray which is an MFC class..How can i add operator= into CPtrArray???

[Mark Salsbery]

Something else is wrong then... CSpanLoad *pA3Ld,*pBDLd; *pA3Ld = *pBDLd; These are not CPtrArrays!

[sheetal_06]

CPtrArray is a member of CSpanLoad... class CPtrArray : public CObject { //does not implement operator= } class __declspec ( dllexport ) CCASObject : public CObject { public: virtual void operator=( const CCADSObject& ){}}; class CSpanLoad : public CCASObject { public: void operator=( const CCASObject& ); private: CPtrArray aPointArrays; }; //spanload.cpp void CSpanLoad::operator=( const CCASObject &src ) { //.... } //Import.cpp int CImport::ReadLoadCategoryData() { CSpanLoad *pA3Ld,*pBDLd; *pA3Ld = *pBDLd; //this assignment is giving error in VS8.In VC6 it was not showing the error; }

[Mark Salsbery]

Ohhh now we're getting close! :) You'll need to implement the copy from one array to another. Deep copy would be creating a new pointer of the object type of the pointer. A shallow copy would be just copying the pointers from the source to the destination array. Just PtrArray = Src.PtrArray; won't work.

[sheetal_06]

could u plz tell me so where is the actual problem??I thought it is generating the error: error C2248: 'CObject::operator =' : cannot access private member declared in class 'CObject'" see declaration of 'CObject::operator =' see declaration of 'CObject' This diagnostic occurred in the compiler generated function 'CPtrArray &CPtrArray::operator =(const CPtrArray &)' b'coz i am trying to pass a CSpanload object into a CCasObject.CCasObject is a dll.So while compiling it may do static linking.At that time it is trying to locate the function 'CPtrArray &CPtrArray::operator =(const CPtrArray &)' which is not actually implemented in CPtrArray...If i am wrong plz correct..

[Mark Salsbery]

sheetal_06 wrote:

At that time it is trying to locate the function 'CPtrArray &CPtrArray::operator =(const CPtrArray &)'

There isn't one implemented. That's why it's an error.

sheetal_06 wrote:

i am trying to pass a CSpanload object into a CCasObject

How are you passing it? Are you sure you need to do a full copy or could you pass a reference or pointer? If you must copy then you'll need to copy the CPtrArray member appropriately. Since it's an array of pointers - if the pointers are allocated using new and you copy the pointers from one array to another, then delete the pointers in one array and try to delete the pointers again in the copy array then it will crash.

[sheetal_06]

Ya,I need to copy the pointer.. The pointers *pA3Ld and *pBDLd are created using new... So could u plz suggest one solution... When i am changing the code as follows it is working...But i din understand why? class CSpanLoad : public CCASObject { public: void operator=( const CSpanLoad & );//earlier it was const CCASObject & private: CPtrArray aPointArrays; }; //spanload.cpp void CSpanLoad::operator=( const CSpanLoad &src )//earlier it was const CCASObject & { //.... }