RandomNumberGenerator.hpp

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*/
 
#ifndef RANDOMNUMBERGENERATORS_HPP_
#define RANDOMNUMBERGENERATORS_HPP_
 
#include <boost/shared_ptr.hpp>
#include <boost/version.hpp>
#include <sstream>
 
#if BOOST_VERSION < 106400
// Forward compatibility with Boost 1.64 onwards
#include "Boost165NormalDistribution.hpp"
#endif
 
#include <boost/random.hpp>
 
#include <boost/serialization/split_member.hpp>
#include "ChasteSerialization.hpp"
#include "SerializableSingleton.hpp"
 
class RandomNumberGenerator : public SerializableSingleton<RandomNumberGenerator>
{
private:
    boost::mt19937 mMersenneTwisterGenerator;
 
    // If you add any more generators below, then remember to add lines for them in the Reseed() method too.
 
    boost::variate_generator<boost::mt19937&, boost::uniform_real<> > mGenerateUnitReal;
 
#if BOOST_VERSION < 106400 // #2585 and #2893
    boost::variate_generator<boost::mt19937&, boost::random::normal_distribution_v165<> > mGenerateStandardNormal;
#else
    boost::variate_generator<boost::mt19937&, boost::normal_distribution<> > mGenerateStandardNormal;
#endif
    static RandomNumberGenerator* mpInstance;
 
    friend class boost::serialization::access;
    template <class Archive>
    void save(Archive& archive, const unsigned int version) const
    {
        std::stringstream rng_internals;
        rng_internals << mMersenneTwisterGenerator;
        std::string rng_internals_string = rng_internals.str();
        archive& rng_internals_string;
 
        std::stringstream normal_internals;
#if BOOST_VERSION < 106400 // #2585 and #2893
        const boost::random::normal_distribution_v165<>& r_normal_dist = mGenerateStandardNormal.distribution();
#else
        const boost::normal_distribution<>& r_normal_dist = mGenerateStandardNormal.distribution();
#endif
        normal_internals << r_normal_dist;
        std::string normal_internals_string = normal_internals.str();
        archive& normal_internals_string;
    }
 
    template <class Archive>
    void load(Archive& archive, const unsigned int version)
    {
        std::string rng_internals_string;
        archive& rng_internals_string;
        std::stringstream rng_internals(rng_internals_string);
        rng_internals >> mMersenneTwisterGenerator;
 
        std::string normal_internals_string;
        archive& normal_internals_string;
        std::stringstream normal_internals(normal_internals_string);
        normal_internals >> mGenerateStandardNormal.distribution();
    }
    BOOST_SERIALIZATION_SPLIT_MEMBER()
 
protected:
    RandomNumberGenerator();
 
public:
    double StandardNormalRandomDeviate();
 
    double NormalRandomDeviate(double mean, double stdDev);
 
    double ranf();
 
    double GammaRandomDeviate(double shape, double scale);
 
    double ExponentialRandomDeviate(double scale);
 
    unsigned randMod(unsigned base);
 
    template <class T>
    void Shuffle(std::vector<boost::shared_ptr<T> >& rValues)
    {
        unsigned num = rValues.size();
        if (num == 0)
        {
            return;
        }
        for (unsigned end = num - 1; end > 0; end--)
        {
            // Pick a random integer from {0,..,end}
            unsigned k = RandomNumberGenerator::Instance()->randMod(end + 1);
            boost::shared_ptr<T> temp = rValues[end];
            rValues[end] = rValues[k];
            rValues[k] = temp;
        }
    }
 
    void Shuffle(unsigned num, std::vector<unsigned>& rValues);
 
    static RandomNumberGenerator* Instance();
 
    static void Destroy();
 
    void Reseed(unsigned seed);
};
 
#endif /*RANDOMNUMBERGENERATORS_HPP_*/