96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/*
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* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
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* Heikki Tauriainen <Heikki.Tauriainen@hut.fi>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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*/
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#ifndef RANDOM_H
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#define RANDOM_H
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#include <config.h>
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#include <cstdlib>
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#ifdef HAVE_RAND48
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#define rand lrand48
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#define srand srand48
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static const double MAXRAND = static_cast<double>(1 << 30) * 2.0;
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#else
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static const double MAXRAND = RAND_MAX + 1.0;
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#endif /* HAVE_RAND48 */
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/******************************************************************************
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*
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* Functions for random number generation. If HAVE_RAND48 is defined, the
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* functions rely on the lrand48() function for generating a random integer
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* between 0 and 2^31 and srand48() for setting the seed for the random
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* number generator; otherwise, the rand() and srand() functions are used,
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* respectively.
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*
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*****************************************************************************/
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/* ========================================================================= */
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inline void SRAND(unsigned int seed)
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/* ----------------------------------------------------------------------------
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*
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* Description: Initializes the random number generator with a seed value.
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*
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* Argument: seed -- Seed for the random number generator.
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*
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* Returns: Nothing.
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*
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* ------------------------------------------------------------------------- */
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{
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srand (seed);
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}
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/* ========================================================================= */
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inline double DRAND()
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/* ----------------------------------------------------------------------------
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*
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* Description: Generates a random double.
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*
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* Arguments: None.
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*
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* Returns: A random double in the half-open interval [0.0,1.0).
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*
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* ------------------------------------------------------------------------- */
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{
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return rand () / MAXRAND;
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}
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/* ========================================================================= */
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inline long int LRAND(long int min, long int max)
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/* ----------------------------------------------------------------------------
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*
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* Description: Generates a random long integer in a given interval.
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*
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* Arguments: min, max -- Bounds for the interval.
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*
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* Returns: A random long integer in the half-open interval [min,max).
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*
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* ------------------------------------------------------------------------- */
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{
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return min + static_cast<long int>(DRAND() * (max - min));
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}
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#ifdef HAVE_RAND48
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#undef rand
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#undef srand
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#endif /* HAVE_RAND48 */
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#endif /* !RANDOM_H */
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