78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoMerge.h
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// Base class for choosing a number of guys to apply something from a popsize
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// (c) Marc Schoenauer, 2000
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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: todos@geneura.ugr.es, http://geneura.ugr.es
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoHowMany_h
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#define eoHowMany_h
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// to be used in selection / replacement procedures to indicate whether
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// the argument (rate, a double) shoudl be treated as a rate (number=rate*popSize)
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// or as an absolute integer (number=rate regardless of popsize).
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// the default value shoudl ALWAYS be true (eo_as_a_rate).
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//
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// this construct is mandatory because in some cases you might not know the
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// population size that will enter the replacement for instance - so you
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// cannot simply have a pre-computed (double) rate of 1/popSize if you want 1 guy
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class eoHowMany
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{
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public:
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eoHowMany(double _rate, bool _interpret_as_rate = true):
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rate(0), howmany(0)
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{
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if (_interpret_as_rate)
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{
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rate = _rate;
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}
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else
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{
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if (_rate<0)
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throw std::logic_error("Negative number in eoHowMany!");
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howmany = (unsigned int)_rate;
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if (howmany != _rate)
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cout << "Warning: Number was rounded in eoHowMany";
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}
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}
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unsigned int operator()(unsigned int _size)
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{
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if (howmany == 0)
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{
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if (rate == 0.0)
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return 0;
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else
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return (unsigned int) (rate * _size);
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}
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return howmany;
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}
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private :
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double rate;
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unsigned howmany;
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};
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#endif
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