// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2020.
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// Modifications copyright (c) 2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP
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#define BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP
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#include <type_traits>
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#include <boost/geometry/core/ring_type.hpp>
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#include <boost/geometry/core/static_assert.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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namespace boost { namespace geometry
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{
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namespace traits
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{
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/*!
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\brief Traits class defining access to exterior_ring of a polygon
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\details Should define const and non const access
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\ingroup traits
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\tparam Polygon the polygon type
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\par Geometries:
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- polygon
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\par Specializations should provide:
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- static inline RING& get(POLY& )
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- static inline RING const& get(POLY const& )
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*/
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template <typename Polygon>
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struct exterior_ring
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{
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BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
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"Not implemented for this Polygon type.",
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Polygon);
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};
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} // namespace traits
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#ifndef DOXYGEN_NO_DISPATCH
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namespace core_dispatch
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{
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template <typename Tag, typename Geometry>
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struct exterior_ring
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{
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BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
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"Not implemented for this Geometry type.",
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Tag, Geometry);
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};
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template <typename Polygon>
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struct exterior_ring<polygon_tag, Polygon>
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{
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static
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typename geometry::ring_return_type<Polygon>::type
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apply(Polygon& polygon)
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{
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return traits::exterior_ring
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<
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typename std::remove_const<Polygon>::type
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>::get(polygon);
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}
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};
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} // namespace core_dispatch
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#endif // DOXYGEN_NO_DISPATCH
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/*!
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\brief Function to get the exterior_ring ring of a polygon
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\ingroup exterior_ring
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\note OGC compliance: instead of ExteriorRing
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\tparam Polygon polygon type
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\param polygon the polygon to get the exterior ring from
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\return a reference to the exterior ring
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*/
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template <typename Polygon>
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inline typename ring_return_type<Polygon>::type exterior_ring(Polygon& polygon)
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{
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return core_dispatch::exterior_ring
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<
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typename tag<Polygon>::type,
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Polygon
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>::apply(polygon);
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}
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/*!
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\brief Function to get the exterior ring of a polygon (const version)
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\ingroup exterior_ring
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\note OGC compliance: instead of ExteriorRing
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\tparam Polygon polygon type
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\param polygon the polygon to get the exterior ring from
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\return a const reference to the exterior ring
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\qbk{distinguish,const version}
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*/
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template <typename Polygon>
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inline typename ring_return_type<Polygon const>::type exterior_ring(
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Polygon const& polygon)
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{
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return core_dispatch::exterior_ring
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<
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typename tag<Polygon>::type,
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Polygon const
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>::apply(polygon);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_CORE_EXTERIOR_RING_HPP
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