// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2010-2012 Barend Gehrels, 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_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP
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#define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP
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// Adapts Geometries from Boost.Polygon for usage in Boost.Geometry
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// boost::polygon::polygon_with_holes_data -> boost::geometry::polygon
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// hole_iterator -> returning ring_proxy's instead of normal polygon_data
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#include <boost/polygon/polygon.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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namespace boost { namespace geometry
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{
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namespace adapt { namespace bp
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{
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template <typename Polygon, typename RingProxy>
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class hole_iterator
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: public ::boost::iterator_facade
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<
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hole_iterator<Polygon, RingProxy>,
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RingProxy, // value type
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boost::forward_traversal_tag,
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RingProxy // reference type
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>
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{
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public :
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typedef typename boost::polygon::polygon_with_holes_traits
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<
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Polygon
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>::iterator_holes_type ith_type;
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explicit inline hole_iterator(Polygon& polygon, ith_type const it)
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: m_polygon(polygon)
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, m_base(it)
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{
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}
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typedef std::ptrdiff_t difference_type;
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private:
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friend class boost::iterator_core_access;
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inline RingProxy dereference() const
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{
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return RingProxy(m_polygon, this->m_base);
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}
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inline void increment() { ++m_base; }
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inline void decrement() { --m_base; }
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inline void advance(difference_type n)
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{
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for (int i = 0; i < n; i++)
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{
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++m_base;
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}
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}
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inline bool equal(hole_iterator<Polygon, RingProxy> const& other) const
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{
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return this->m_base == other.m_base;
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}
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Polygon& m_polygon;
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ith_type m_base;
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};
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}}}}
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#endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP
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