/usr/include/libcoyotl/mwc1038.h is in libcoyotl-dev 3.1.0-5.
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
//
// mwc1038.cpp (libcoyotl)
//
// A multiply with carry psudeorandom number generator, as suggested
// by George Marsaglia in Januray 2003. The original message can be
// found at:
//
// http://forums.wolfram.com/mathgroup/archive/2003/Jan/msg00355.html
//
//---------------------------------------------------------------------
//
// COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
//
// This notice applies *only* to this specific expression of this
// algorithm, and does not imply ownership or invention of the
// implemented algorithm.
//
// If you modify this file, you may insert additional notices
// immediately following this sentence.
//
// Copyright 2001-2004 Scott Robert Ladd.
// All rights reserved, except as noted herein.
//
// This computer program source file is supplied "AS IS". Scott Robert
// Ladd (hereinafter referred to as "Author") disclaims all warranties,
// expressed or implied, including, without limitation, the warranties
// of merchantability and of fitness for any purpose. The Author
// assumes no liability for direct, indirect, incidental, special,
// exemplary, or consequential damages, which may result from the use
// of this software, even if advised of the possibility of such damage.
//
// The Author hereby grants anyone permission to use, copy, modify, and
// distribute this source code, or portions hereof, for any purpose,
// without fee, subject to the following restrictions:
//
// 1. The origin of this source code must not be misrepresented.
//
// 2. Altered versions must be plainly marked as such and must not
// be misrepresented as being the original source.
//
// 3. This Copyright notice may not be removed or altered from any
// source or altered source distribution.
//
// The Author specifically permits (without fee) and encourages the use
// of this source code for entertainment, education, or decoration. If
// you use this source code in a product, acknowledgment is not required
// but would be appreciated.
//
// Acknowledgement:
// This license is based on the wonderful simple license that
// accompanies libpng.
//
//-----------------------------------------------------------------------
// For more information on this software package, please visit
// Scott's web site, Coyote Gulch Productions, at:
//
// http://www.coyotegulch.com
//-----------------------------------------------------------------------
#if !defined(LIBCOYOTL_MWC1038_H)
#define LIBCOYOTL_MWC1038_H
#include "prng.h"
namespace libcoyotl
{
//! Implements MWC1038, a peudorandom number generator
/*!
The mwc1038 class encapsulates a multiply-with-carry algorithm
for psuedorandom number generation, as suggested by George
Marsaglia in a posting found here:
http://forums.wolfram.com/mathgroup/archive/2003/Jan/msg00355.html
*/
class mwc1038 : public prng
{
private:
// Period parameters
static const size_t N = 1038;
// Working storage
uint32_t m_q[N];
uint32_t m_carry;
int 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.
*/
mwc1038();
//! 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
*/
mwc1038(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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