tupleHashFunc.cpp

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/**
 *
 *   Copyright 2005-2020 Pierre-Henri WUILLEMIN(@LIP6) & Christophe GONZALES(@AMU)
 *   info_at_agrum_dot_org
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


/**
 * @file
 * @brief Template implementations for the GTestPolicy class.
 *
 * @author Jean-Christophe MAGNAN
 */
// =========================================================================
#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