EvolvingObjects
eoRandomSelect.h
00001 // -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
00002 
00003 //-----------------------------------------------------------------------------
00004 // eoRandomSelect.h
00005 // (c) GeNeura Team, 1998 - EEAAX 1999, Maarten Keijzer 2000
00006 /*
00007     This library is free software; you can redistribute it and/or
00008     modify it under the terms of the GNU Lesser General Public
00009     License as published by the Free Software Foundation; either
00010     version 2 of the License, or (at your option) any later version.
00011 
00012     This library is distributed in the hope that it will be useful,
00013     but WITHOUT ANY WARRANTY; without even the implied warranty of
00014     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015     Lesser General Public License for more details.
00016 
00017     You should have received a copy of the GNU Lesser General Public
00018     License along with this library; if not, write to the Free Software
00019     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00020 
00021     Contact: todos@geneura.ugr.es, http://geneura.ugr.es
00022              Marc.Schoenauer@polytechnique.fr
00023              mak@dhi.dk
00024  */
00025 
00026 #ifndef eoRandomSelect_h
00027 #define eoRandomSelect_h
00028 
00035 #include <utils/eoRNG.h>
00036 #include <eoSelectOne.h>
00037 
00042 template <class EOT> class eoRandomSelect: public eoSelectOne<EOT>
00043 {
00044  public:
00045 
00047   virtual const EOT& operator()(const eoPop<EOT>& _pop)
00048   {
00049     return _pop[eo::rng.random(_pop.size())] ;
00050   }
00051 };
00052 
00058 template <class EOT> class eoBestSelect: public eoSelectOne<EOT>
00059 {
00060  public:
00061 
00063   virtual const EOT& operator()(const eoPop<EOT>& _pop)
00064   {
00065     return _pop.best_element() ;
00066   }
00067 };
00068 
00074 template <class EOT> class eoNoSelect: public eoSelectOne<EOT>
00075 {
00076  public:
00079   eoNoSelect(): current(0) {}
00080 
00081   virtual const EOT& operator()(const eoPop<EOT>& _pop)
00082   {
00083     if (current >= _pop.size())
00084       current=0;
00085 
00086     current++;
00087     return _pop[current-1] ;
00088   }
00089 private:
00090   unsigned current;
00091 };
00092 
00093 #endif
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