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/**
* @author Adam McLaurin
* @date September 2006
*/
/*
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
GN6U 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.
*/
#include "RandomNumber.h"
#include <limits>
#include <time.h>
#ifdef SOCKETS_NAMESPACE
namespace SOCKETS_NAMESPACE {
#endif
const unsigned long int RandomNumber::X_SEED_DEFAULT = 123456789UL;
const unsigned long int RandomNumber::Y_SEED_DEFAULT = 362436069UL;
const unsigned long int RandomNumber::Z_SEED_DEFAULT = 521288629UL;
const unsigned long int RandomNumber::W_SEED_DEFAULT = 88675123UL;
RandomNumber::RandomNumber(bool time_shuffle)
:mXSeed(time_shuffle ? (unsigned long)time(NULL) ^ X_SEED_DEFAULT : X_SEED_DEFAULT)
,mYSeed(time_shuffle ? (unsigned long)time(NULL) ^ Y_SEED_DEFAULT : Y_SEED_DEFAULT)
,mZSeed(time_shuffle ? (unsigned long)time(NULL) ^ Z_SEED_DEFAULT : Z_SEED_DEFAULT)
,mWSeed(time_shuffle ? (unsigned long)time(NULL) ^ W_SEED_DEFAULT : W_SEED_DEFAULT)
{
reset();
}
RandomNumber::RandomNumber(
unsigned long int x_seed,
unsigned long int y_seed,
unsigned long int z_seed,
unsigned long int w_seed)
:mXSeed(x_seed)
,mYSeed(y_seed)
,mZSeed(z_seed)
,mWSeed(w_seed)
{
reset();
}
RandomNumber::~RandomNumber()
{
}
void RandomNumber::reset()
{
mX = mXSeed;
mY = mYSeed;
mZ = mZSeed;
mW = mWSeed;
}
RandomNumber::operator unsigned long int() const
{
return(mW);
}
unsigned long int RandomNumber::next()
{
register unsigned long int t = (mX ^ (mX<<11));
mX = mY;
mY = mZ;
mZ = mW;
return(mW = (mW ^ (mW>>19)) ^ (t ^ (t>>8)));
}
unsigned long int RandomNumber::skip(unsigned long int s)
{
for(register unsigned long int i = 0 ; i < s ; ++i)
{
(void)next();
}
return(mW);
}
void RandomNumber::getSeed(
unsigned long int& x_seed,
unsigned long int& y_seed,
unsigned long int& z_seed,
unsigned long int& w_seed)
{
x_seed = mXSeed;
y_seed = mYSeed;
z_seed = mZSeed;
w_seed = mWSeed;
}
unsigned long int RandomNumber::max_random()
{
return(std::numeric_limits<unsigned long int>::max());
}
#ifdef SOCKETS_NAMESPACE
} // namespace SOCKETS_NAMESPACE {
#endif
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