/usr/include/libcoyotl/mwc256.h is in libcoyotl-dev 3.1.0-6ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Algorithmic Conjurings @ http://www.coyotegulch.com
//
// mwc256.cpp (libcoyotl)
//
// A multiply with carry psudeorandom number generator, as suggested
// by George Marsaglia.
//---------------------------------------------------------------------
//
// Copyright 1990-2005 Scott Robert Ladd
//
// 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.
//
//-----------------------------------------------------------------------
//
// For more information on this software package, please visit
// Scott's web site, Coyote Gulch Productions, at:
//
// http://www.coyotegulch.com
//
//-----------------------------------------------------------------------
#if !defined(LIBCOYOTL_MWC256_H)
#define LIBCOYOTL_MWC256_H
#include "prng.h"
namespace libcoyotl
{
//! Implements MWC256, a peudorandom number generator
/*!
A multiply with carry psudeorandom number generator, as suggested
by George Marsaglia.
*/
class mwc256 : public prng
{
private:
// Period parameters
static const size_t N = 256;
// Working storage
uint32_t m_q[N];
uint32_t m_carry;
uint8_t m_index;
public:
//! Default constructor, reading seed from/dev/urandom or the time.
/*!
The constructor initializes the prng seed from either the time
or some stochastic source such as /dev/random or /dev/urandom.
*/
mwc256();
//! Default constructor, with optional seed.
/*!
The constructor uses an explicit value for the seed.
\param seed - Seed value used to "start" or seed the generator
*/
mwc256(uint32_t seed);
//! Initializes the generator with "seed"
/*!
Resets the generator using the provided seed value.
\param seed - Seed value used to "start" or seed the generator
*/
virtual void init(uint32_t seed);
private:
//! Initializes the generator with "seed"
/*!
Initializes internal tables based on the current seed value.
\param seed - Seed value used to "start" or seed the generator
*/
void init_helper();
public:
//! Get the next integer
/*!
Returns the next uint32_t in sequence.
\return A pseudorandom uint32_t value
*/
virtual uint32_t get_rand();
};
} // end namespace libcoyotl
#endif
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