Chris@102: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@102: 
Chris@102: // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
Chris@102: 
Chris@102: // This file was modified by Oracle on 2013, 2014.
Chris@102: // Modifications copyright (c) 2013-2014, Oracle and/or its affiliates.
Chris@102: 
Chris@102: // Use, modification and distribution is subject to the Boost Software License,
Chris@102: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: 
Chris@102: // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
Chris@102: 
Chris@102: #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
Chris@102: #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
Chris@102: 
Chris@102: #include <boost/type_traits/is_base_of.hpp>
Chris@102: #include <boost/geometry/core/tag.hpp>
Chris@102: #include <boost/geometry/util/range.hpp>
Chris@102: 
Chris@102: namespace boost { namespace geometry {
Chris@102: 
Chris@102: #ifndef DOXYGEN_NO_DISPATCH
Chris@102: namespace detail_dispatch {
Chris@102: 
Chris@102: // Returns single geometry by Id
Chris@102: // for single geometries returns the geometry itself
Chris@102: template <typename Geometry,
Chris@102:           bool IsMulti = boost::is_base_of
Chris@102:                             <
Chris@102:                                 multi_tag,
Chris@102:                                 typename geometry::tag<Geometry>::type
Chris@102:                             >::value
Chris@102: >
Chris@102: struct single_geometry
Chris@102: {
Chris@102:     typedef Geometry & return_type;
Chris@102: 
Chris@102:     template <typename Id>
Chris@102:     static inline return_type apply(Geometry & g, Id const& ) { return g; }
Chris@102: };
Chris@102: 
Chris@102: // for multi geometries returns one of the stored single geometries
Chris@102: template <typename Geometry>
Chris@102: struct single_geometry<Geometry, true>
Chris@102: {
Chris@102:     typedef typename boost::mpl::if_c
Chris@102:         <
Chris@102:             boost::is_const<Geometry>::value,
Chris@102:             typename boost::range_value<Geometry>::type const&,
Chris@102:             typename boost::range_value<Geometry>::type
Chris@102:         >::type return_type;
Chris@102: 
Chris@102:     template <typename Id>
Chris@102:     static inline return_type apply(Geometry & g, Id const& id)
Chris@102:     {
Chris@102:         BOOST_ASSERT(id.multi_index >= 0);
Chris@102:         typedef typename boost::range_size<Geometry>::type size_type;
Chris@102:         return range::at(g, static_cast<size_type>(id.multi_index));
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: } // namespace detail_dispatch
Chris@102: #endif // DOXYGEN_NO_DISPATCH
Chris@102: 
Chris@102: #ifndef DOXYGEN_NO_DETAIL
Chris@102: namespace detail {
Chris@102: 
Chris@102: template <typename Geometry>
Chris@102: struct single_geometry_return_type
Chris@102: {
Chris@102:     typedef typename detail_dispatch::single_geometry<Geometry>::return_type type;
Chris@102: };
Chris@102: 
Chris@102: template <typename Geometry, typename Id>
Chris@102: inline
Chris@102: typename single_geometry_return_type<Geometry>::type
Chris@102: single_geometry(Geometry & geometry, Id const& id)
Chris@102: {
Chris@102:     return detail_dispatch::single_geometry<Geometry>::apply(geometry, id);
Chris@102: }
Chris@102: 
Chris@102: template <typename Geometry, typename Id>
Chris@102: inline
Chris@102: typename single_geometry_return_type<Geometry const>::type
Chris@102: single_geometry(Geometry const& geometry, Id const& id)
Chris@102: {
Chris@102:     return detail_dispatch::single_geometry<Geometry const>::apply(geometry, id);
Chris@102: }
Chris@102: 
Chris@102: } // namespace detail
Chris@102: #endif // DOXYGEN_NO_DETAIL
Chris@102: 
Chris@102: }} // namespace boost::geometry
Chris@102: 
Chris@102: #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP