backend_seq.hpp

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//============================================================================
// vSMC/include/vsmc/smp/backend_seq.hpp
//----------------------------------------------------------------------------
//                         vSMC: Scalable Monte Carlo
//----------------------------------------------------------------------------
// Copyright (c) 2013-2015, Yan Zhou
// 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.
//
// 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 HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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//============================================================================

#ifndef VSMC_SMP_BACKEND_SEQ_HPP
#define VSMC_SMP_BACKEND_SEQ_HPP

#include <vsmc/smp/backend_base.hpp>

namespace vsmc
{

VSMC_DEFINE_SMP_BACKEND_FORWARD(SEQ)

template <typename StateBase>
using StateSEQ = StateBase;

template <typename T, typename Derived>
class InitializeSEQ : public InitializeBase<T, Derived>
{
    public:
    std::size_t operator()(Particle<T> &particle, void *param)
    {
        using size_type = typename Particle<T>::size_type;
        const size_type N = particle.size();
        this->eval_param(particle, param);
        this->eval_pre(particle);
        std::size_t accept = 0;
        for (size_type i = 0; i != N; ++i)
            accept += this->eval_sp(SingleParticle<T>(i, &particle));
        this->eval_post(particle);

        return accept;
    }

    protected:
    VSMC_DEFINE_SMP_BACKEND_SPECIAL(SEQ, Initialize)
}; // class InitializeSEQ

template <typename T, typename Derived>
class MoveSEQ : public MoveBase<T, Derived>
{
    public:
    std::size_t operator()(std::size_t iter, Particle<T> &particle)
    {
        using size_type = typename Particle<T>::size_type;
        const size_type N = particle.size();
        this->eval_pre(iter, particle);
        std::size_t accept = 0;
        for (size_type i = 0; i != N; ++i)
            accept += this->eval_sp(iter, SingleParticle<T>(i, &particle));
        this->eval_post(iter, particle);

        return accept;
    }

    protected:
    VSMC_DEFINE_SMP_BACKEND_SPECIAL(SEQ, Move)
}; // class MoveSEQ

template <typename T, typename Derived>
class MonitorEvalSEQ : public MonitorEvalBase<T, Derived>
{
    public:
    void operator()(
        std::size_t iter, std::size_t dim, Particle<T> &particle, double *r)
    {
        using size_type = typename Particle<T>::size_type;
        const size_type N = particle.size();
        this->eval_pre(iter, particle);
        for (size_type i = 0; i != N; ++i) {
            this->eval_sp(iter, dim, SingleParticle<T>(i, &particle),
                r + static_cast<std::size_t>(i) * dim);
        }
        this->eval_post(iter, particle);
    }

    protected:
    VSMC_DEFINE_SMP_BACKEND_SPECIAL(SEQ, MonitorEval)
}; // class MonitorEvalSEQ

template <typename T, typename Derived>
class PathEvalSEQ : public PathEvalBase<T, Derived>
{
    public:
    double operator()(std::size_t iter, Particle<T> &particle, double *r)
    {
        using size_type = typename Particle<T>::size_type;
        const size_type N = particle.size();
        this->eval_pre(iter, particle);
        for (size_type i = 0; i != N; ++i)
            r[i] = this->eval_sp(iter, SingleParticle<T>(i, &particle));
        this->eval_post(iter, particle);

        return this->eval_grid(iter, particle);
    }

    protected:
    VSMC_DEFINE_SMP_BACKEND_SPECIAL(SEQ, PathEval)
}; // class PathEvalSEQ

} // namespace vsmc

#endif // VSMC_SMP_BACKEND_SEQ_HPP