multinomial.hpp

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//============================================================================
// vSMC/include/vsmc/resample/multinomial.hpp
//----------------------------------------------------------------------------
//                         vSMC: Scalable Monte Carlo
//----------------------------------------------------------------------------
// Copyright (c) 2013-2016, Yan Zhou
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
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//   Redistributions in binary form must reproduce the above copyright notice,
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//============================================================================

#ifndef VSMC_RESAMPLE_MULTINOMIAL_HPP
#define VSMC_RESAMPLE_MULTINOMIAL_HPP

#include <vsmc/resample/internal/common.hpp>
#include <vsmc/resample/transform.hpp>

namespace vsmc
{

class ResampleMultinomial
{
    public:
    template <typename IntType, typename RNGType>
    void operator()(std::size_t M, std::size_t N, RNGType &rng,
        const double *weight, IntType *replication)
    {
        U01SequenceSorted<RNGType, double> u01seq(N, rng);
        resample_trans_u01_rep(M, N, weight, u01seq, replication);
    }
}; // ResampleMultinomial

template <>
class ResampleTypeTrait<Multinomial>
{
    public:
    using type = ResampleMultinomial;
}; // class ResampleTypeTrait

} // namespace vsmc

#endif //  VSMC_RESAMPLE_MULTINOMIAL_HPP