#if 0
    assert(
        static_cast<std::size_t>((std::numeric_limits<std::streamsize>::max)()) >= count
    );
    //if(is.fail())
    //    boost::throw_exception(archive_exception(archive_exception::stream_error));
    // note: an optimizer should eliminate the following for char files
    std::size_t s = count / sizeof(BOOST_DEDUCED_TYPENAME IStream::char_type);
    is.read(
        static_cast<BOOST_DEDUCED_TYPENAME IStream::char_type *>(address),
        s
    );
    // note: an optimizer should eliminate the following for char files
    s = count % sizeof(BOOST_DEDUCED_TYPENAME IStream::char_type);
    if(0 < s){
        if(is.fail())
            boost::throw_exception(archive_exception(archive_exception::stream_error));
        BOOST_DEDUCED_TYPENAME IStream::char_type t;
        is.read(& t, 1);
        std::memcpy(address, &t, s);
    }
#endif
    // note: an optimizer should eliminate the following for char files
    std::streamsize s = count / sizeof(Elem);
    std::streamsize scount = m_sb.sgetn(
        static_cast<Elem *>(address),
        s
    );
    if(count != static_cast<std::size_t>(s))
        boost::throw_exception(
            archive_exception(archive_exception::stream_error)
        );
    // note: an optimizer should eliminate the following for char files
    s = count % sizeof(Elem);
    if(0 < s){
//        if(is.fail())
//            boost::throw_exception(archive_exception(archive_exception::stream_error));
        Elem t;
        scount = m_sb.sgetn(& t, 1);
        if(count != 1)
            boost::throw_exception(
                archive_exception(archive_exception::stream_error)
            );
        std::memcpy(address, &t, s);
    }