/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */// primary template for type promotiontemplate<typename T1, typename T2>class Promotion {  public:    typedef typename             IfThenElse<(sizeof(T1)>sizeof(T2)),                       T1,                       typename IfThenElse<(sizeof(T1)<sizeof(T2)),                                           T2,                                           void                                          >::ResultT                      >::ResultT ResultT;};