Offset.h

#ifndef UTIL_OFFSET_H
#define UTIL_OFFSET_H
 
#include <cstddef>
 
/*
* Util Package - C++ Utilities for Scientific Computation
*
* Copyright 2010 - 2017, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/
 
namespace Util
{
 
   template <typename D, typename B, typename M>
   ptrdiff_t memberOffset(D& object, M  B::* memPtr)
   {  
      return reinterpret_cast<char*>(&(object.*memPtr)) - reinterpret_cast<char*>(&object); 
   }
   
   template <typename D, typename B>
   ptrdiff_t baseOffset(D& object)
   {  
      D* d = &object; 
      B* b = (B*) d;
      return reinterpret_cast<char*>(d) - reinterpret_cast<char*>(b); 
   }
   
 
 
}
#endif