Assigns a single range reference to the CXlOper
const CXlOper& FromSRef( const CXlRef& xlr, bool clear );
Range reference to be applied to the CXlOper.
If clear is false, then the current contents of the CXlOper will not be destroyed. Since this may cause memory leaks, it should be used with care
This function assigns the range reference contained in xlr to the CXlOper, and sets the type of the CXlOper to be xltypeSRef.