Pass struct from Tool to Operator

[Andruha Prostrelov]

I am looking for the way to pass a "struct" from Tool Class to the
CustomOperator_Update() callback.
I saw two approaches to this in SDK. First one should work via UserData
attached to ctxt. You store in this
data C++ pointer to allocated memory with your struct. Second one is to
create Property and store this pointer in
property. I prefer do not create additional Property, so i tried to add
UserData to ctxt.
But i don't quite sure that i make it right.
I tried this piece of code ...

    struct myStruct{
           XSI::CLongArray polyData;
           XSI::CValueArray edgeSegmentsArray;
    }
    SICALLBACK myCmd_Execute( CRef& in_ctxt ){
          PlugData pData;
          PlugData * pDataPtr;
          pDataPtr = &pData;
          ctxt.PutUserData(XSI::CValue(pDataPtr));
    }
    SICALLBACK myOperator_Update( CRef& in_ctxt ){
           OperatorContext ctxt( in_ctxt );
           CValue userData(ctxt.GetUserData());
           update_func(ctxt);
           return CStatus::OK;
    }

... but in Update callback i didn't get pointer back.

If someone has already faced a similar problem maybe you can share some
advices.
Or maybe there is a way to pass struct without UserData or Custom Property.