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Diffstat (limited to 'boost/geometry/geometries/adapted/boost_polygon/hole_iterator.hpp')
-rw-r--r-- | boost/geometry/geometries/adapted/boost_polygon/hole_iterator.hpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/boost/geometry/geometries/adapted/boost_polygon/hole_iterator.hpp b/boost/geometry/geometries/adapted/boost_polygon/hole_iterator.hpp new file mode 100644 index 0000000000..c9c1bc7b61 --- /dev/null +++ b/boost/geometry/geometries/adapted/boost_polygon/hole_iterator.hpp @@ -0,0 +1,84 @@ +// Boost.Geometry (aka GGL, Generic Geometry Library) + +// Copyright (c) 2010-2012 Barend Gehrels, 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_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP +#define BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP + +// Adapts Geometries from Boost.Polygon for usage in Boost.Geometry +// boost::polygon::polygon_with_holes_data -> boost::geometry::polygon +// hole_iterator -> returning ring_proxy's instead of normal polygon_data + +#include <boost/polygon/polygon.hpp> + +#include <boost/iterator.hpp> +#include <boost/iterator/iterator_facade.hpp> + + +namespace boost { namespace geometry +{ + +namespace adapt { namespace bp +{ + + +template <typename Polygon, typename RingProxy> +class hole_iterator + : public ::boost::iterator_facade + < + hole_iterator<Polygon, RingProxy>, + RingProxy, // value type + boost::forward_traversal_tag, + RingProxy // reference type + > +{ +public : + typedef typename boost::polygon::polygon_with_holes_traits + < + Polygon + >::iterator_holes_type ith_type; + + explicit inline hole_iterator(Polygon& polygon, ith_type const it) + : m_polygon(polygon) + , m_base(it) + { + } + + typedef std::ptrdiff_t difference_type; + +private: + friend class boost::iterator_core_access; + + inline RingProxy dereference() const + { + return RingProxy(m_polygon, this->m_base); + } + + inline void increment() { ++m_base; } + inline void decrement() { --m_base; } + inline void advance(difference_type n) + { + for (int i = 0; i < n; i++) + { + ++m_base; + } + } + + inline bool equal(hole_iterator<Polygon, RingProxy> const& other) const + { + return this->m_base == other.m_base; + } + + Polygon& m_polygon; + ith_type m_base; +}; + + +}}}} + +#endif // BOOST_GEOMETRY_GEOMETRIES_ADAPTED_BOOST_POLYGON_HOLE_ITERATOR_HPP + |