Source: krandomsequence.h
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/*
This file is part of the KDE libraries
Copyright (c) 1999 Sean Harmer <sh@astro.keele.ac.uk>
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; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef K_RANDOM_SEQUENCE_H
#define K_RANDOM_SEQUENCE_H
class KRandomSequence
{
public:
/**
* Creates a pseudo-random sequence based on the seed lngSeed.
*
* @param lngSeed Seed to initialize the sequence with.
*
* If lngSeed is 0, the sequence is initialized with a value from
* kapp->random().
*
* A Pseudo-random sequence is different for each seed but can be
* reproduced by starting the sequence with the same seed.
*
* If you need a single value which needs to be unpredictable,
* you need to use kapp->random() instead.
*
*/
KRandomSequence( long lngSeed = 1 );
~KRandomSequence();
/**
* Restart the sequence based on lngSeed
*/
void setSeed( long lngSeed = 1 );
/**
* Get the next number from the pseudo-random sequence
*
* @return a psuedo-random double value between [0,1[
*/
double getDouble();
/**
* Get the next number from the pseudo-random sequence
*
* @return a pseudo-random integer value between [0, max[
* with 0 < max <= 1.000.000
*/
unsigned long getLong(unsigned long max);
private:
void Draw(); // Generate the random number
long m_lngSeed1;
long m_lngSeed2;
long m_lngShufflePos;
static const int m_nShuffleTableSize;
long *m_ShuffleArray;
};
#endif
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