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// Rand48.h
// this file is part of Context Free
// ---------------------
// Copyright (C) 2008 John Horigan - john@glyphic.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// John Horigan can be contacted at john@glyphic.com or at
// John Horigan, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
//
#ifndef INCLUDE_RAND48_H
#define INCLUDE_RAND48_H
#include <limits.h>
// If limits.h defines ULLONG_MAX then use the unsigned long long version.
// Otherwise use the unsigned short[3] version
class Rand48 {
public:
#ifdef ULLONG_MAX
unsigned long long mSeed;
#else
unsigned short mSeed0;
unsigned short mSeed1;
unsigned short mSeed2;
#endif
static Rand48 Common;
static bool BigEndian;
#ifdef ULLONG_MAX
Rand48(): mSeed(0) {}
Rand48(unsigned short seed0, unsigned short seed1, unsigned short seed2)
{ seed(seed0, seed1, seed2); }
#else
Rand48(): mSeed0(0), mSeed1(0), mSeed2(0) {}
Rand48(unsigned short seed0, unsigned short seed1, unsigned short seed2)
: mSeed0(seed0), mSeed1(seed1), mSeed2(seed2) {}
#endif
Rand48(long seed) { setRand(seed); }
double getDouble(bool bump = true);
long getLong(bool bump = true);
long getPositive(bool bump = true);
unsigned long getUnsigned(bool bump = true);
void seed(unsigned short seed0, unsigned short seed1, unsigned short seed2);
void seed(const unsigned short* seed);
void setRand(long seed);
Rand48& operator^=(const Rand48& r)
{
#ifdef ULLONG_MAX
mSeed ^= r.mSeed;
#else
mSeed0 ^= r.mSeed0;
mSeed1 ^= r.mSeed1;
mSeed2 ^= r.mSeed2;
#endif
return *this;
};
void xorChar(char c, unsigned i);
void bump();
};
#endif // INCLUDE_RAND48_H
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