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// -*- C++ -*-
/***************************************************************************
* random/default.h Default IRNG wrapper class
*
* $Id$
*
* Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org>
*
* This file is a part of Blitz.
*
* Blitz is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Blitz 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Blitz. If not, see <http://www.gnu.org/licenses/>.
*
* Suggestions: blitz-devel@lists.sourceforge.net
* Bugs: blitz-support@lists.sourceforge.net
*
* For more information, please see the Blitz++ Home Page:
* https://sourceforge.net/projects/blitz/
*
***************************************************************************/
#ifndef BZ_RANDOM_DEFAULT_H
#define BZ_RANDOM_DEFAULT_H
#include <random/mt.h>
BZ_NAMESPACE(ranlib)
// Some terminology:
// IRNG = Integer Random Number Generator. IRNGs generate random
// integers, which are used to create floating-point random
// numbers.
// RNG = Random Number Generator. RNGs use IRNGs to create floating-
// point random numbers following desired distributions.
typedef float defaultType;
// These are type tags. A RNG with sharedState shares an IRNG
// with other RNGs. An RNG with independentState
// contains its own IRNG. Generally, sharedState RNGs should be
// used.
struct sharedState { };
struct independentState { };
typedef sharedState defaultState;
typedef unsigned int IRNG_int;
// IRNGWrapper handles shared and independent state IRNGs.
// If a class inherits from IRNGWrapper<IRNG,sharedState>,
// it gets a static IRNG (i.e. the IRNG state is shared among
// all RNGs); if it inherits from IRNGWrapper<IRNG,independentState>,
// it gets an independent IRNG (the IRNG state is encapsulated
// in the RNG, and is not shared among RNGs).
template<typename IRNG, typename state>
class IRNGWrapper {
};
template<typename IRNG>
class IRNGWrapper<IRNG,sharedState> {
public:
void seed(IRNG_int x)
{ irng_.seed(x); }
void seed(std::vector<IRNG_int> x)
{ irng_.seed(x); }
typedef typename IRNG::T_state T_state;
T_state getState() const { return irng_.getState(); }
std::string getStateString() const { return irng_.getStateString(); }
void setState(const T_state& s) { irng_.setState(s); }
void setState(const std::string& s) { irng_.setState(s); }
protected:
static IRNG irng_;
};
template<typename IRNG>
IRNG IRNGWrapper<IRNG,sharedState>::irng_;
template<typename IRNG>
class IRNGWrapper<IRNG,independentState> {
public:
IRNGWrapper() {};
IRNGWrapper(unsigned int i) : irng_(MersenneTwisterCreator::create(i)) {};
void seed(IRNG_int x)
{ irng_.seed(x); }
void seed(std::vector<IRNG_int> x)
{ irng_.seed(x); }
typedef typename IRNG::T_state T_state;
T_state getState() const { return irng_.getState(); }
std::string getStateString() const { return irng_.getStateString(); }
void setState(const T_state& s) { irng_.setState(s); }
void setState(const std::string& s) { irng_.setState(s); }
protected:
IRNG irng_;
};
// defaultIRNG is a type alias for the default Integer Random
// Number Generator (IRNG).
typedef MersenneTwister defaultIRNG;
BZ_NAMESPACE_END
#endif // BZ_RANDOM_DEFAULT_H
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