176 lines
4.4 KiB
C++
176 lines
4.4 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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/*
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Copyright (C) 1990 Free Software Foundation
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adapted from a submission from John Reidl <riedl@cs.purdue.edu>
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY. No author or distributor
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accepts responsibility to anyone for the consequences of using it
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or for whether it serves any particular purpose or works at all,
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unless he says so in writing. Refer to the GNU CC General Public
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License for full details.
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Everyone is granted permission to copy, modify and redistribute
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GNU CC, but only under the conditions described in the
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GNU CC General Public License. A copy of this license is
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supposed to have been given to you along with GNU CC so you
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can know your rights and responsibilities. It should be in a
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file named COPYING. Among other things, the copyright notice
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This file is part of the GNU C++ Library. This library is free
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software; you can redistribute it and/or modify it under the terms of
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the GNU Library General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version. This library is distributed in the hope
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that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _RandomInteger_h
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#ifdef __GNUG__
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#pragma interface
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#endif
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#define _RandomInteger_h 1
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// RandomInteger uses a random number generator to generate an integer
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// in a specified range. By default the range is 0..1. Since in my
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// experience random numbers are often needed for a wide variety of
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// ranges in the same program, this generator accepts a new low or high value
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// as an argument to the asLong and operator() methods to temporarily
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// override stored values
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#include <math.h>
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#include <RNG.h>
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class RandomInteger
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{
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protected:
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RNG *pGenerator;
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long pLow;
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long pHigh;
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long _asLong(long, long);
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public:
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RandomInteger(long low, long high, RNG *gen);
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RandomInteger(long high, RNG *gen);
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RandomInteger(RNG *gen);
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// read params
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long low() const;
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long high() const;
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RNG* generator() const;
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// change params
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long low(long x);
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long high(long x);
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RNG* generator(RNG *gen);
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// get a random number
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long asLong();
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long operator()(); // synonym for asLong
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int asInt(); // (possibly) truncate as int
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// override params for one shot
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long asLong(long high);
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long asLong(long low, long high);
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long operator () (long high); // synonyms
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long operator () (long low, long high);
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};
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inline RandomInteger::RandomInteger(long low, long high, RNG *gen)
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: pLow((low < high) ? low : high),
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pHigh((low < high) ? high : low),
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pGenerator(gen)
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{}
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inline RandomInteger::RandomInteger(long high, RNG *gen)
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: pLow((0 < high) ? 0 : high),
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pHigh((0 < high) ? high : 0),
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pGenerator(gen)
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{}
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inline RandomInteger::RandomInteger(RNG *gen)
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: pLow(0),
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pHigh(1),
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pGenerator(gen)
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{}
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inline RNG* RandomInteger::generator() const { return pGenerator;}
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inline long RandomInteger::low() const { return pLow; }
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inline long RandomInteger::high() const { return pHigh; }
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inline RNG* RandomInteger::generator(RNG *gen)
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{
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RNG *tmp = pGenerator; pGenerator = gen; return tmp;
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}
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inline long RandomInteger::low(long x)
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{
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long tmp = pLow; pLow = x; return tmp;
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}
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inline long RandomInteger:: high(long x)
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{
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long tmp = pHigh; pHigh = x; return tmp;
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}
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inline long RandomInteger:: _asLong(long low, long high)
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{
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return (pGenerator->asLong() % (high-low+1)) + low;
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}
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inline long RandomInteger:: asLong()
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{
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return _asLong(pLow, pHigh);
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}
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inline long RandomInteger:: asLong(long high)
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{
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return _asLong(pLow, high);
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}
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inline long RandomInteger:: asLong(long low, long high)
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{
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return _asLong(low, high);
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}
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inline long RandomInteger:: operator () ()
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{
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return _asLong(pLow, pHigh);
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}
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inline long RandomInteger:: operator () (long high)
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{
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return _asLong(pLow, high);
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}
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inline long RandomInteger:: operator () (long low, long high)
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{
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return _asLong(low, high);
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}
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inline int RandomInteger:: asInt()
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{
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return int(asLong());
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}
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#endif
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