/*
 *  Open BEAGLE
 *  Copyright (C) 2001-2004 by Christian Gagne and Marc Parizeau
 *
 *  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 2.1 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:
 *  Laboratoire de Vision et Systemes Numeriques
 *  Departement de genie electrique et de genie informatique
 *  Universite Laval, Quebec, Canada, G1V 4J7
 *  http://vision.gel.ulaval.ca
 *
 */

/*!
 *  \file   beagle/GA/ESVector.hpp
 *  \brief  Definition of the type GA::ESVector.
 *  \author Christian Gagne
 *  \author Marc Parizeau
 *  $Revision: 1.3 $
 *  $Date: 2004/01/15 21:08:56 $
 */

/*!
 *  \defgroup GAES Evolution Strategy
 *  \ingroup GAF
 *  \brief Evolution strategy (ES) representation, operators and evolvers, part of the GA framework.
 *
 *  Actual evolution strategy support in the GA framework includes a representation made of vectors of
 *  (value,strategy) pairs, where the value is parameter value and strategy is the adaptive mutation
 *  parameter strategy, a simple mutation operator for the vector of pairs representation and a
 *  ES evolver using by default a (mu,lambda) replacement strategy. Different GA crossover are also
 *  supported although they are not used in the default ES evolver.
 */
 
#ifndef Beagle_GA_ESVector_hpp
#define Beagle_GA_ESVector_hpp

#include <vector>

#include "beagle/config.hpp"
#include "beagle/macros.hpp"
#include "beagle/Object.hpp"
#include "beagle/Allocator.hpp"
#include "beagle/Pointer.hpp"
#include "beagle/Container.hpp"
#include "beagle/ContainerT.hpp"
#include "beagle/Genotype.hpp"


namespace Beagle {
namespace GA {

/*!
 *  \struct ESPair beagle/GA/ESVector.hpp "beagle/GA/ESVector.hpp"
 *  \brief Evolution strategy (value, strategy parameter) pair composing ES genotypes.
 *  \ingroup GAF
 *  \ingroup GAES
 */
struct ESPair {
  float mValue;      //!< Value of the element of the ES vector.
  float mStrategy;   //!< Strategy parameter to use for ES mutation of the value.
  
  ESPair(float inValue=0.0, float inStrategy=1.0);
  bool operator==(const ESPair& inRightPair) const;
};


/*!
 *  \class ESVector beagle/GA/ESVector.hpp "beagle/GA/ESVector.hpp"
 *  \brief Evolution strategy genotype class.
 *  \ingroup GAF
 *  \ingroup GAES
 */
class ESVector : public Genotype, public std::vector<ESPair> {

public:

  //! ESVector allocator type.
  typedef AllocatorT<ESVector,Genotype::Alloc>
          Alloc;
  //! ESVector handle type.
  typedef PointerT<ESVector,Genotype::Handle>
          Handle;
  //! ESVector bag type.
  typedef ContainerT<ESVector,Genotype::Bag>
          Bag;

  explicit ESVector(unsigned int inSize=0, ESPair inModel=ESPair(0.0,1.0));
  virtual ~ESVector() { }

  virtual bool isEqual(const Object& inRightObj) const;
  virtual void readWithContext(XMLNode::Handle& inNode, Context& ioContext);
  virtual void write(XMLStreamer& ioStreamer) const;

};

}
}

#endif // Beagle_GA_ESVector_hpp

