MFnAnimCurve - 2012->2013 compile issue

[dreidrage]

I’m getting the following error when trying to compile my 2012 code for 2013.

error C2248: ‘MFnAnimCurve::MFnAnimCurve’ : cannot access private member declared in class ‘MFnAnimCurve’

I did a diff between MFnAnimCurve.h and it doesn’t look like anything has changed AND MFnAnimCurve doesn’t have any private members.  The actual code is :

updateCurves( acX, acY, acZ);

and acX, acY, acZ are all passed into the function that calls this as MFnAnimCurves

MFnAnimCurve acX, MFnAnimCurve acY, MFnAnimCurve acZ

Any ideas what has changed between 2012 and 13 that would cause this? 
Thanks in advnace for any help 

[dreidrage]

I've got a clue on this, but not sure what it means.

if I change my function calls to

updateCurves(acX.object(),acY.object(),acZ.object());

I don't get it, can you not pass and MFnAnimCurve as an argument to a function?  Also, this solutions works fine on PC, but still fails on a Mac saying:

MFnAnimCurve::MFnAnimCurve(const MFnAnimCUrve&) is private within this context

I'm not sure what changed within the class where this wasn't an issue pre 2013, but any clues would be appreciated

[wendye]

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