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A new util class to handle the rate/integer argument to selectors/replacement

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evomarc 2000-12-19 18:09:10 +00:00
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eo/src/utils/eoHowMany.h Normal file
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// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
//-----------------------------------------------------------------------------
// eoMerge.h
// Base class for choosing a number of guys to apply something from a popsize
// (c) Marc Schoenauer, 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 eoHowMany_h
#define eoHowMany_h
// to be used in selection / replacement procedures to indicate whether
// the argument (rate, a double) shoudl be treated as a rate (number=rate*popSize)
// or as an absolute integer (number=rate regardless of popsize).
// the default value shoudl ALWAYS be true (eo_as_a_rate).
//
// this construct is mandatory because in some cases you might not know the
// population size that will enter the replacement for instance - so you
// cannot simply have a pre-computed (double) rate of 1/popSize if you want 1 guy
class eoHowMany
{
public:
eoHowMany(double _rate, bool _interpret_as_rate = true):
rate(0), howmany(0)
{
if (_interpret_as_rate)
{
rate = _rate;
}
else
{
if (_rate<0)
throw std::logic_error("Negative number in eoHowMany!");
howmany = (unsigned int)_rate;
if (howmany != _rate)
cout << "Warning: Number was rounded in eoHowMany";
}
}
unsigned int operator()(unsigned int _size)
{
if (howmany == 0)
{
if (rate == 0.0)
return 0;
else
return (unsigned int) (rate * _size);
}
return howmany;
}
private :
double rate;
unsigned howmany;
};
#endif