// Boost.Geometry // Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland. // Use, modification and distribution is subject to the Boost Software License, // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_GEOMETRY_UTIL_SELECT_SEQUENCE_ELEMENT #define BOOST_GEOMETRY_UTIL_SELECT_SEQUENCE_ELEMENT #include #include #include #include #include #include #include namespace boost { namespace geometry { namespace util { template struct pred_more_precise_coordinate_type { typedef typename geometry::coordinate_type::type curr_coord_t; typedef typename geometry::coordinate_type::type next_coord_t; typedef typename boost::mpl::if_c < boost::is_same < curr_coord_t, typename select_most_precise < curr_coord_t, next_coord_t >::type >::value, Curr, Next >::type type; }; template < typename Seq, template class Pred = pred_more_precise_coordinate_type, int I = 0, int N = boost::mpl::size::value > struct select_sequence_element { typedef typename boost::mpl::at >::type curr_t; typedef typename select_sequence_element::type next_t; typedef typename Pred::type type; }; template class Pred, int N> struct select_sequence_element { typedef typename boost::mpl::at >::type type; }; } // namespace util }} // namespace boost::geometry #endif // BOOST_GEOMETRY_UTIL_SELECT_SEQUENCE_ELEMENT