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/*
* Copyright (c) 2014 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Nathan Binkert
* Ali Saidi
* Andreas Hansson
*/
/*
* Mersenne twister random number generator.
*/
#ifndef __BASE_RANDOM_HH__
#define __BASE_RANDOM_HH__
#include <random>
#include <string>
#include <type_traits>
#include "base/types.hh"
class Checkpoint;
class Random
{
private:
std::mt19937_64 gen;
public:
Random();
Random(uint32_t s);
~Random();
void init(uint32_t s);
/**
* Use the SFINAE idiom to choose an implementation based on
* whether the type is integral or floating point.
*/
template <typename T>
typename std::enable_if<std::is_integral<T>::value, T>::type
random()
{
// [0, max_value] for integer types
std::uniform_int_distribution<T> dist;
return dist(gen);
}
template <typename T>
typename std::enable_if<std::is_floating_point<T>::value, T>::type
random()
{
// [0, 1) for real types
std::uniform_real_distribution<T> dist;
return dist(gen);
}
template <typename T>
typename std::enable_if<std::is_integral<T>::value, T>::type
random(T min, T max)
{
std::uniform_int_distribution<T> dist(min, max);
return dist(gen);
}
void serialize(std::ostream &os);
void unserialize(Checkpoint *cp, const std::string §ion);
};
extern Random random_mt;
#endif // __BASE_RANDOM_HH__
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