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HashRNG.hpp

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#ifndef RISE_SCENARIO_PATHLOSS_DETAIL_HASHRNG_HPP
#define RISE_SCENARIO_PATHLOSS_DETAIL_HASHRNG_HPP

#include <RISE/scenario/pathloss/DistanceDependent.hpp>
#include <boost/random.hpp>

namespace rise { namespace scenario { namespace pathloss {

namespace detail {

class HashRNG
{
public:
    HashRNG(unsigned int initialSeed,
            wns::Position p1,
            wns::Position p2,
            bool correlateBS,
            bool correlateUT);

    static const bool has_fixed_range = true;

    double
    operator()();

    double
    min()
    {
        return 0.0;
    }

    double
    max()
    {
        return 1.0;
    }

private:
    template<typename T>
    void combine( unsigned int& hash, T t)
    {
        unsigned int* it= (unsigned int*)(&t);

        assure(sizeof(T) % sizeof(unsigned int) == 0, "Incompatible hash types in HashRNG::combineDouble");

        int count = sizeof(T) / sizeof(unsigned int);

        for (int ii=0; ii < count; ++ii)
        {
            // DJB Hash function
            hash = ((hash << 5) + hash) + *it;
            it++;
        }
    }

    boost::mt19937 rng;
    boost::uniform_real<> uni;
    boost::variate_generator<boost::mt19937&, boost::uniform_real<> > dis;

    unsigned int myHash;
};

} // detail
} // pathloss
} // scenario
} // rise

#endif // RISE_SCENARIO_PATHLOSS_DETAIL_HASHRNG_HPP

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