eostochtournamentselect.h

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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

//-----------------------------------------------------------------------------
// eoStochTournamentSelect.h
// (c) GeNeura Team, 1998 - EEAAX 1999
/* 
    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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Contact: [e-mail], http://geneura.ugr.es
             [e-mail]
 */
//-----------------------------------------------------------------------------

#ifndef eoStochTournamentSelect_h
#define eoStochTournamentSelect_h

//-----------------------------------------------------------------------------

#include <functional>
#include <numeric>           // accumulate
#include <eoSelectOne.h>     // eoSelectOne
#include <utils/selectors.h> // stochastic_tournament

//-----------------------------------------------------------------------------
/** eoStochTournamentSelect: a selection method that selects ONE individual by
 binary stochastic tournament 
 -MS- 24/10/99 */
//-----------------------------------------------------------------------------

template <class EOT> class eoStochTournamentSelect: public eoSelectOne<EOT>
{
 public:

  ///
  eoStochTournamentSelect(double _Trate = 1.0 ) : eoSelectOne<EOT>(), Trate(_Trate) 
  {
    // consistency checks
    if (Trate < 0.5) {
      std::cerr << "Warning, Tournament rate should be > 0.5\nAdjusted to 0.55\n";
      Trate = 0.55;
    }
    if (Trate > 1) {
      std::cerr << "Warning, Tournament rate should be < 1\nAdjusted to 1\n";
      Trate = 1;
    }
  }
  
  /** Perform the stochastic tournament  */
  virtual const EOT& operator()(const eoPop<EOT>& pop) 
  {
      return stochastic_tournament(pop, Trate);
  }
  
private:
  double Trate;
};

//-----------------------------------------------------------------------------

#endif