error: conversion from
‘std::reverse_iterator<
    boost::multi_index::detail::bidir_node_iterator<
        boost::multi_index::detail::ordered_index_node<
            boost::multi_index::detail::hashed_index_node<
                boost::multi_index::detail::index_node_base<long unsigned int, std::allocator<long unsigned int> >
                , boost::multi_index::detail::hashed_unique_tag> > > >’

to non-scalar type
‘boost::multi_index::detail::ordered_index<
    boost::multi_index::identity<long unsigned int>
    , IndexComparator
    , boost::multi_index::detail::nth_layer<1, long unsigned int
        , boost::multi_index::indexed_by<
            boost::multi_index::ordered_non_unique<
                boost::multi_index::identity<long unsigned int>
                , IndexComparator>
            , boost::multi_index::hashed_unique<boost::multi_index::identity<long unsigned int> > >
        , std::allocator<long unsigned int> >
    , boost::mpl::vector0<mpl_::na>
    , boost::multi_index::detail::ordered_non_unique_tag>::reverse_iterator
{aka
boost::iterators::reverse_iterator<
    boost::multi_index::detail::bidir_node_iterator<
        boost::multi_index::detail::ordered_index_node<
            boost::multi_index::detail::hashed_index_node<
                boost::multi_index::detail::index_node_base<long unsigned int, std::allocator<long unsigned int> >
                , boost::multi_index::detail::hashed_unique_tag> > > >
}’ requested