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107 lines
2.7 KiB
107 lines
2.7 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 Mateusz Loskot, London, UK. |
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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_ALGORITHMS_DETAIL_AS_RANGE_HPP |
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP |
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#include <boost/type_traits.hpp> |
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#include <boost/geometry/core/exterior_ring.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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#include <boost/geometry/util/add_const_if_c.hpp> |
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namespace boost { namespace geometry |
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{ |
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#ifndef DOXYGEN_NO_DISPATCH |
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namespace dispatch |
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{ |
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template <typename GeometryTag, typename Geometry, typename Range, bool IsConst> |
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struct as_range |
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{ |
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static inline typename add_const_if_c<IsConst, Range>::type& get( |
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typename add_const_if_c<IsConst, Geometry>::type& input) |
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{ |
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return input; |
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} |
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}; |
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template <typename Geometry, typename Range, bool IsConst> |
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struct as_range<polygon_tag, Geometry, Range, IsConst> |
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{ |
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static inline typename add_const_if_c<IsConst, Range>::type& get( |
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typename add_const_if_c<IsConst, Geometry>::type& input) |
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{ |
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return exterior_ring(input); |
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} |
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}; |
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} // namespace dispatch |
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#endif // DOXYGEN_NO_DISPATCH |
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// Will probably be replaced by the more generic "view_as", therefore in detail |
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namespace detail |
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{ |
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/*! |
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\brief Function getting either the range (ring, linestring) itself |
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or the outer ring (polygon) |
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\details Utility to handle polygon's outer ring as a range |
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\ingroup utility |
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*/ |
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template <typename Range, typename Geometry> |
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inline Range& as_range(Geometry& input) |
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{ |
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return dispatch::as_range |
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< |
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typename tag<Geometry>::type, |
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Geometry, |
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Range, |
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false |
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>::get(input); |
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} |
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/*! |
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\brief Function getting either the range (ring, linestring) itself |
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or the outer ring (polygon), const version |
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\details Utility to handle polygon's outer ring as a range |
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\ingroup utility |
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*/ |
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template <typename Range, typename Geometry> |
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inline Range const& as_range(Geometry const& input) |
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{ |
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return dispatch::as_range |
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< |
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typename tag<Geometry>::type, |
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Geometry, |
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Range, |
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true |
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>::get(input); |
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} |
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} |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
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