tupleHashFunc.cpp

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/***************************************************************************
 *   Copyright (C) 2005 by Christophe GONZALES and Pierre-Henri WUILLEMIN  *
 *   {prenom.nom}_at_lip6.fr                                               *
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// =========================================================================
#include <agrum/FMDP/learning/core/tupleHashFunc.h>
// =========================================================================


namespace gum {

  // Returns the value of a key as a Size.
  Size HashFunc< std::tuple< unsigned int, unsigned int, unsigned int > >::
     castToSize(
        const std::tuple< unsigned int, unsigned int, unsigned int >& key) {
    return HashFuncConst::pi * Size(std::get< 0 >(key)) * Size(2)
           * Size(std::get< 1 >(key)) * Size(3) * Size(std::get< 2 >(key));
  }

  // the hash function for tuple (unsigned int, unsigned int, unsigned int)
  Size HashFunc< std::tuple< unsigned int, unsigned int, unsigned int > >::
       operator()(
        const std::tuple< unsigned int, unsigned int, unsigned int >& key) const {
    return (castToSize(key) * HashFuncConst::gold) & this->_hash_mask;
  }

}   // namespace gum