Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@16: // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
Chris@16: // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
Chris@16: // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
Chris@16: #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
Chris@16: 
Chris@16: 
Chris@16: #include <boost/type_traits.hpp>
Chris@16: 
Chris@16: #include <boost/geometry/core/exterior_ring.hpp>
Chris@16: #include <boost/geometry/core/tag.hpp>
Chris@16: #include <boost/geometry/core/tags.hpp>
Chris@16: 
Chris@16: #include <boost/geometry/util/add_const_if_c.hpp>
Chris@16: 
Chris@16: 
Chris@16: namespace boost { namespace geometry
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: #ifndef DOXYGEN_NO_DISPATCH
Chris@16: namespace dispatch
Chris@16: {
Chris@16: 
Chris@16: 
Chris@16: template <typename GeometryTag, typename Geometry, typename Range, bool IsConst>
Chris@16: struct as_range
Chris@16: {
Chris@16:     static inline typename add_const_if_c<IsConst, Range>::type& get(
Chris@16:             typename add_const_if_c<IsConst, Geometry>::type& input)
Chris@16:     {
Chris@16:         return input;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template <typename Geometry, typename Range, bool IsConst>
Chris@16: struct as_range<polygon_tag, Geometry, Range, IsConst>
Chris@16: {
Chris@16:     static inline typename add_const_if_c<IsConst, Range>::type& get(
Chris@16:             typename add_const_if_c<IsConst, Geometry>::type& input)
Chris@16:     {
Chris@16:         return exterior_ring(input);
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: } // namespace dispatch
Chris@16: #endif // DOXYGEN_NO_DISPATCH
Chris@16: 
Chris@16: // Will probably be replaced by the more generic "view_as", therefore in detail
Chris@16: namespace detail
Chris@16: {
Chris@16: 
Chris@16: /*!
Chris@16: \brief Function getting either the range (ring, linestring) itself
Chris@16: or the outer ring (polygon)
Chris@16: \details Utility to handle polygon's outer ring as a range
Chris@16: \ingroup utility
Chris@16: */
Chris@16: template <typename Range, typename Geometry>
Chris@16: inline Range& as_range(Geometry& input)
Chris@16: {
Chris@16:     return dispatch::as_range
Chris@16:         <
Chris@16:             typename tag<Geometry>::type,
Chris@16:             Geometry,
Chris@16:             Range,
Chris@16:             false
Chris@16:         >::get(input);
Chris@16: }
Chris@16: 
Chris@16: 
Chris@16: /*!
Chris@16: \brief Function getting either the range (ring, linestring) itself
Chris@16: or the outer ring (polygon), const version
Chris@16: \details Utility to handle polygon's outer ring as a range
Chris@16: \ingroup utility
Chris@16: */
Chris@16: template <typename Range, typename Geometry>
Chris@16: inline Range const& as_range(Geometry const& input)
Chris@16: {
Chris@16:     return dispatch::as_range
Chris@16:         <
Chris@16:             typename tag<Geometry>::type,
Chris@16:             Geometry,
Chris@16:             Range,
Chris@16:             true
Chris@16:         >::get(input);
Chris@16: }
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: }} // namespace boost::geometry
Chris@16: 
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP