nojhan
e64417f2a5
Give an access to the operators held by a breeder. This is needed to design algorithms that dynamically update their internal parameters during search. To simplify the interface, we use a returned tuple, and thus upgrade the C++ standard to C++11.
121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoGeneralBreeder.h
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// (c) Maarten Keijzer and Marc Schoenauer, 2001
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/*
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: mkeijzer@dhi.dk
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Marc.Schoenauer@polytechnique.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoGeneralBreeder_h
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#define eoGeneralBreeder_h
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//-----------------------------------------------------------------------------
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/*****************************************************************************
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* eoGeneralBreeder: transforms a population using the generalOp construct.
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*****************************************************************************/
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#include <tuple>
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#include "eoOp.h"
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#include "eoGenOp.h"
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#include "eoPopulator.h"
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#include "eoSelectOne.h"
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#include "eoBreed.h"
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#include "utils/eoHowMany.h"
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/**
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Base class for breeders using generalized operators.
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@ingroup Combination
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*/
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template<class EOT>
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class eoGeneralBreeder: public eoBreed<EOT>
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{
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public:
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/** Ctor:
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*
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* @param _select a selectoOne, to be used for all selections
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* @param _op a general operator (will generally be an eoOpContainer)
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* @param _rate pour howMany, le nbre d'enfants a generer
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* @param _interpret_as_rate <a href="../../tutorial/html/eoEngine.html#howmany">explanation</a>
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*/
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eoGeneralBreeder(
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eoSelectOne<EOT>& _select,
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eoGenOp<EOT>& _op,
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double _rate=1.0,
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bool _interpret_as_rate = true) :
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select( _select ), op(_op),
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local_howMany(_rate, _interpret_as_rate),
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howMany(local_howMany)
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{}
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/** Ctor:
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*
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* @param _select a selectoOne, to be used for all selections
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* @param _op a general operator (will generally be an eoOpContainer)
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* @param _howMany an eoHowMany <a href="../../tutorial/html/eoEngine.html#howmany">explanation</a>
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*/
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eoGeneralBreeder(
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eoSelectOne<EOT>& _select,
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eoGenOp<EOT>& _op,
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eoHowMany& _howMany ) :
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select( _select ), op(_op), howMany(_howMany) {}
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/** The breeder: simply calls the genOp on a selective populator!
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*
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* @param _parents the initial population
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* @param _offspring the resulting population (content -if any- is lost)
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*/
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void operator()(const eoPop<EOT>& _parents, eoPop<EOT>& _offspring)
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{
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unsigned target = howMany(_parents.size());
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_offspring.clear();
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eoSelectivePopulator<EOT> it(_parents, _offspring, select);
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while (_offspring.size() < target)
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{
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op(it);
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++it;
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}
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_offspring.resize(target); // you might have generated a few more
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}
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/// The class name.
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virtual std::string className() const { return "eoGeneralBreeder"; }
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virtual std::tuple
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<eoSelectOne<EOT>&,eoGenOp<EOT>&,eoHowMany&>
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operators()
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{
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return std::forward_as_tuple
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<eoSelectOne<EOT>&,eoGenOp<EOT>&,eoHowMany&>
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(select, op, howMany);
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}
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protected:
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eoSelectOne<EOT>& select;
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eoGenOp<EOT>& op;
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eoHowMany local_howMany;
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eoHowMany& howMany;
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};
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#endif
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