| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| |
| // Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
| // Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
| // Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
| |
| // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library |
| // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. |
| |
| // 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_CORE_INTERIOR_RINGS_HPP |
| #define BOOST_GEOMETRY_CORE_INTERIOR_RINGS_HPP |
| |
| #include <cstddef> |
| |
| #include <boost/mpl/assert.hpp> |
| #include <boost/range.hpp> |
| #include <boost/type_traits/remove_const.hpp> |
| |
| #include <boost/geometry/core/tag.hpp> |
| #include <boost/geometry/core/tags.hpp> |
| #include <boost/geometry/core/interior_type.hpp> |
| |
| namespace boost { namespace geometry |
| { |
| |
| namespace traits |
| { |
| |
| |
| /*! |
| \brief Traits class defining access to interior_rings of a polygon |
| \details defines access (const and non const) to interior ring |
| \ingroup traits |
| \par Geometries: |
| - polygon |
| \par Specializations should provide: |
| - static inline INTERIOR& get(POLY&) |
| - static inline const INTERIOR& get(POLY const&) |
| \tparam Geometry geometry |
| */ |
| template <typename Geometry> |
| struct interior_rings |
| { |
| BOOST_MPL_ASSERT_MSG |
| ( |
| false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY_TYPE |
| , (types<Geometry>) |
| ); |
| }; |
| |
| |
| } // namespace traits |
| |
| |
| |
| |
| #ifndef DOXYGEN_NO_DISPATCH |
| namespace core_dispatch |
| { |
| |
| template |
| < |
| typename GeometryTag, |
| typename Geometry |
| > |
| struct interior_rings {}; |
| |
| |
| template <typename Polygon> |
| struct interior_rings<polygon_tag, Polygon> |
| { |
| static inline |
| typename geometry::interior_return_type<Polygon>::type |
| apply(Polygon& polygon) |
| { |
| return traits::interior_rings |
| < |
| typename boost::remove_const<Polygon>::type |
| >::get(polygon); |
| } |
| }; |
| |
| |
| } // namespace core_dispatch |
| #endif |
| |
| |
| |
| /*! |
| \brief Function to get the interior rings of a polygon (non const version) |
| \ingroup interior_rings |
| \note OGC compliance: instead of InteriorRingN |
| \tparam Polygon polygon type |
| \param polygon the polygon to get the interior rings from |
| \return the interior rings (possibly a reference) |
| */ |
| |
| template <typename Polygon> |
| inline typename interior_return_type<Polygon>::type interior_rings(Polygon& polygon) |
| { |
| return core_dispatch::interior_rings |
| < |
| typename tag<Polygon>::type, |
| Polygon |
| >::apply(polygon); |
| } |
| |
| |
| /*! |
| \brief Function to get the interior rings of a polygon (const version) |
| \ingroup interior_rings |
| \note OGC compliance: instead of InteriorRingN |
| \tparam Polygon polygon type |
| \param polygon the polygon to get the interior rings from |
| \return the interior rings (possibly a const reference) |
| |
| \qbk{distinguish,const version} |
| */ |
| template <typename Polygon> |
| inline typename interior_return_type<Polygon const>::type interior_rings( |
| Polygon const& polygon) |
| { |
| return core_dispatch::interior_rings |
| < |
| typename tag<Polygon>::type, |
| Polygon const |
| >::apply(polygon); |
| } |
| |
| |
| |
| }} // namespace boost::geometry |
| |
| |
| #endif // BOOST_GEOMETRY_CORE_INTERIOR_RINGS_HPP |