Declare an abstract base class to IMPLEMENT_SERIAL

				
//**************************************
// Name: Declare an abstract base class to IMPLEMENT_SERIAL
// Description:How can I declare an abstract base class to be IMPLEMENT_SERIAL?
You need a special form of IMPLEMENT_SERIAL that looks like this: Use the regular DECLARE_SERIAL but use IMPLEMENT_SERIAL_ABC shown below instead of IMPLEMENT_SERIAL. 
// By: Found on the World Wide Web
//**************************************

#define IMPLEMENT_SERIAL_ABC(class_name, base_class_name, wSchema) 
_IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, wSchema, NULL) 
CArchive& AFXAPI operator>>(CArchive& ar, class_name* &pOb) 
{ 
pOb = (class_name*) ar.ReadObject(RUNTIME_CLASS(class_name)); 
return ar; 
}