copy_compare_aggregates.hpp

/*
 * copy_aggregates.hpp
 *
 *  Created on: Oct 31, 2015
 *      Author: i-bird
 */

#ifndef OPENFPM_DATA_SRC_UTIL_COPY_COMPARE_AGGREGATES_HPP_
#define OPENFPM_DATA_SRC_UTIL_COPY_COMPARE_AGGREGATES_HPP_

#include <boost/type_traits.hpp>

template<typename T> struct meta_copy;
template<typename T> struct meta_compare;

template<typename S>
struct copy_aggregate
{
    const S & src;

    S & dst;

    inline copy_aggregate(const S & src, S & dst)
    :src(src),dst(dst){};

    template<typename T>
    inline void operator()(T& t) const
    {
        // This is the type of the object we have to copy
        typedef typename boost::fusion::result_of::at_c<typename S::type,T::value>::type copy_type;

        // Remove the reference from the type to copy
        typedef typename boost::remove_reference<copy_type>::type copy_rtype;

        meta_copy<copy_rtype> cp(src.template get<T::value>(),dst.template get<T::value>());
    }
};


template<typename S>
struct compare_aggregate
{
    bool eq;

    const S & src;

    const S & dst;

    inline compare_aggregate(const S & src, const S & dst)
    :eq(true),src(src),dst(dst){};

    template<typename T>
    inline void operator()(T& t)
    {
        // This is the type of the object we have to copy
        typedef typename boost::fusion::result_of::at_c<typename S::type,T::value>::type compare_type;

        // Remove the reference from the type to copy
        typedef typename boost::remove_reference<compare_type>::type compare_rtype;

        if (eq == false)
            return;

        eq = meta_compare<compare_rtype>::meta_compare_f(boost::fusion::at_c<T::value>(src.data),boost::fusion::at_c<T::value>(dst.data));
    }

    inline bool result()
    {
        return eq;
    }
};

#endif /* OPENFPM_DATA_SRC_UTIL_COPY_COMPARE_AGGREGATES_HPP_ */