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

-----------------------------------------------------------------------------
    eoEvalFuncPtr.h
      Converts a classical C fitness evaluation function into a fitness
      evaluation object

    (c) GeNeura Team, 2000
 
    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: todos@geneura.ugr.es, http://geneura.ugr.es
 */
//-----------------------------------------------------------------------------

#ifndef EOEVALFUNCPTR_H
#define EOEVALFUNCPTR_H

#include <eoEvalFunc.h>

/** EOEvalFuncPtr: This class
 * takes an existing function pointer and converts it into a evaluation
 * function class. That way, old style C or C++ functions can be adapted to EO
 * function classes.
 *
 * @ingroup Evaluation
 */
#ifdef _MSC_VER
template< class EOT, class FitT = EOT::Fitness, class FunctionArg = const EOT& >
#else
template< class EOT, class FitT = typename EOT::Fitness, class FunctionArg = const EOT& >
#endif
struct eoEvalFuncPtr: public eoEvalFunc<EOT> {

  /** Applies the function to the chromosome and sets the fitness of the
      Chrom. Thus, the evaluation function need not be worried about that.
      @param _eval pointer to the evaluation function, takes a EOT as an
                   argument and returns the fitness
      @return the evaluated fitness for that object.
  */
  eoEvalFuncPtr( FitT (* _eval)( FunctionArg ) )
    : eoEvalFunc<EOT>(), evalFunc( _eval ) {};
  
  /// Effectively applies the evaluation function to an EO 
  virtual void operator() ( EOT & _eo ) 
  {
    if (_eo.invalid())
        _eo.fitness((*evalFunc)( _eo ));
  };
    
  private:
    FitT (* evalFunc )( FunctionArg );
};

#endif