ptrhash.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id: ptrhash.h,v 1.1 2008-04-08 16:05:32 ssnyder Exp $
 
 
#ifndef SGTOOLS_PTRHASH_H
#define SGTOOLS_PTRHASH_H
 
 
#include <cstdlib>
 
 
namespace SG {
 

struct ptrhash
{
  std::size_t operator() (const void* p) const
  {
    std::size_t x = reinterpret_cast<std::size_t> (p);
    return (x>>3) ^ (x&7);
  }
};
 
 
} // namespace SG
 
 
#endif // not SGTOOLS_PTRHASH_H