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Diffstat (limited to 'gnu/lib/libg++/include/RndInt.h')
-rw-r--r-- | gnu/lib/libg++/include/RndInt.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/gnu/lib/libg++/include/RndInt.h b/gnu/lib/libg++/include/RndInt.h new file mode 100644 index 0000000..b16c7f8 --- /dev/null +++ b/gnu/lib/libg++/include/RndInt.h @@ -0,0 +1,175 @@ +// This may look like C code, but it is really -*- C++ -*- +/* +Copyright (C) 1990 Free Software Foundation + adapted from a submission from John Reidl <riedl@cs.purdue.edu> + + +GNU CC is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY. No author or distributor +accepts responsibility to anyone for the consequences of using it +or for whether it serves any particular purpose or works at all, +unless he says so in writing. Refer to the GNU CC General Public +License for full details. + +Everyone is granted permission to copy, modify and redistribute +GNU CC, but only under the conditions described in the +GNU CC General Public License. A copy of this license is +supposed to have been given to you along with GNU CC so you +can know your rights and responsibilities. It should be in a +file named COPYING. Among other things, the copyright notice +This file is part of the GNU C++ Library. This library is free +software; you can redistribute it and/or modify it under the terms of +the GNU Library 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 Library General Public License for more details. +You should have received a copy of the GNU Library General Public +License along with this library; if not, write to the Free Software +Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#ifndef _RandomInteger_h +#ifdef __GNUG__ +#pragma interface +#endif +#define _RandomInteger_h 1 + +// RandomInteger uses a random number generator to generate an integer +// in a specified range. By default the range is 0..1. Since in my +// experience random numbers are often needed for a wide variety of +// ranges in the same program, this generator accepts a new low or high value +// as an argument to the asLong and operator() methods to temporarily +// override stored values + +#include <math.h> +#include <RNG.h> + +class RandomInteger +{ + protected: + RNG *pGenerator; + long pLow; + long pHigh; + + long _asLong(long, long); + + public: + + RandomInteger(long low, long high, RNG *gen); + RandomInteger(long high, RNG *gen); + RandomInteger(RNG *gen); + +// read params + + long low() const; + long high() const; + RNG* generator() const; + +// change params + + long low(long x); + long high(long x); + RNG* generator(RNG *gen); + +// get a random number + + long asLong(); + long operator()(); // synonym for asLong + int asInt(); // (possibly) truncate as int + +// override params for one shot + + long asLong(long high); + long asLong(long low, long high); + + long operator () (long high); // synonyms + long operator () (long low, long high); + +}; + + +inline RandomInteger::RandomInteger(long low, long high, RNG *gen) + : pLow((low < high) ? low : high), + pHigh((low < high) ? high : low), + pGenerator(gen) +{} + +inline RandomInteger::RandomInteger(long high, RNG *gen) + : pLow((0 < high) ? 0 : high), + pHigh((0 < high) ? high : 0), + pGenerator(gen) +{} + + +inline RandomInteger::RandomInteger(RNG *gen) + : pLow(0), + pHigh(1), + pGenerator(gen) +{} + +inline RNG* RandomInteger::generator() const { return pGenerator;} +inline long RandomInteger::low() const { return pLow; } +inline long RandomInteger::high() const { return pHigh; } + +inline RNG* RandomInteger::generator(RNG *gen) +{ + RNG *tmp = pGenerator; pGenerator = gen; return tmp; +} + +inline long RandomInteger::low(long x) +{ + long tmp = pLow; pLow = x; return tmp; +} + +inline long RandomInteger:: high(long x) +{ + long tmp = pHigh; pHigh = x; return tmp; +} + +inline long RandomInteger:: _asLong(long low, long high) +{ + return (pGenerator->asLong() % (high-low+1)) + low; +} + + +inline long RandomInteger:: asLong() +{ + return _asLong(pLow, pHigh); +} + +inline long RandomInteger:: asLong(long high) +{ + return _asLong(pLow, high); +} + +inline long RandomInteger:: asLong(long low, long high) +{ + return _asLong(low, high); +} + +inline long RandomInteger:: operator () () +{ + return _asLong(pLow, pHigh); +} + +inline long RandomInteger:: operator () (long high) +{ + return _asLong(pLow, high); +} + +inline long RandomInteger:: operator () (long low, long high) +{ + return _asLong(low, high); +} + + + + +inline int RandomInteger:: asInt() +{ + return int(asLong()); +} + +#endif |