129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoHowMany_h.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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/**
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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, you
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* cannot simply have a pre-computed (double) rate of 1/popSize
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* if you want 1 guy
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*
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* Example use: in <a href="class_eogeneralbreeder.html">eoGeneralBreeder.h</a>
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* Example reading from parser: in
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* <a href="make_algo_scalar_h-source.html">do/make_algo_scalar.h line 141</a>
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*/
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class eoHowMany : public eoPersistent
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{
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public:
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/** Original Ctor from direct rate + bool */
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eoHowMany(double _rate = 0.0, bool _interpret_as_rate = true):
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rate(0), combien(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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combien = (unsigned int)_rate;
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if (combien != _rate)
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cout << "Warning: Number was rounded in eoHowMany";
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}
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}
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/// Virtual dtor. They are needed in virtual class hierarchies.
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virtual ~eoHowMany() {}
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unsigned int operator()(unsigned int _size)
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{
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if (combien == 0)
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{
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return (unsigned int) (rate * _size);
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}
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return combien;
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}
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virtual void printOn(ostream& _os) const
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{
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if (combien == 0)
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_os << 100*rate << "% " << std::ends;
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else
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_os << combien << " " << std::ends;
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return;
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}
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virtual void readFrom(istream& _is)
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{
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string value;
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_is >> value;
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readFrom(value);
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return;
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}
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void readFrom(std::string _value)
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{
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// check for %
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bool interpret_as_rate = false; // == no %
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size_t pos = _value.find('%');
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if (pos < _value.size()) // found a %
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{
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interpret_as_rate = true;
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_value.resize(pos); // get rid of %
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}
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std::istrstream is(_value.c_str());
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is >> rate;
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// now store
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if (interpret_as_rate)
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{
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combien = 0;
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rate /= 100.0;
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}
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else
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combien = unsigned(rate); // and rate will not be used
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// minimal check
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if ( (combien <= 0) && (rate <= 0.0) )
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throw runtime_error("Invalid parameters read in eoHowMany::readFrom");
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}
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private :
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double rate;
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unsigned combien;
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};
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#endif
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