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100 lines
2.7 KiB
100 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_VIEWS_CLOSEABLE_VIEW_HPP |
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#define BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP |
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#include <boost/range.hpp> |
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#include <boost/geometry/core/closure.hpp> |
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#include <boost/geometry/core/ring_type.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/iterators/closing_iterator.hpp> |
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#include <boost/geometry/views/identity_view.hpp> |
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namespace boost { namespace geometry |
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{ |
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#ifndef DOXYGEN_NO_DETAIL |
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namespace detail |
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{ |
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template <typename Range> |
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struct closing_view |
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{ |
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// Keep this explicit, important for nested views/ranges |
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explicit inline closing_view(Range& r) |
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: m_range(r) |
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{} |
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typedef closing_iterator<Range> iterator; |
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typedef closing_iterator<Range const> const_iterator; |
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inline const_iterator begin() const { return const_iterator(m_range); } |
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inline const_iterator end() const { return const_iterator(m_range, true); } |
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inline iterator begin() { return iterator(m_range); } |
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inline iterator end() { return iterator(m_range, true); } |
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private : |
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Range& m_range; |
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}; |
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} |
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#endif // DOXYGEN_NO_DETAIL |
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/*! |
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\brief View on a range, either closing it or leaving it as it is |
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\details The closeable_view is used internally by the library to handle all rings, |
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either closed or open, the same way. The default method is closed, all |
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algorithms process rings as if they are closed. Therefore, if they are opened, |
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a view is created which closes them. |
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The closeable_view might be used by library users, but its main purpose is |
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internally. |
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\tparam Range Original range |
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\tparam Close Specifies if it the range is closed, if so, nothing will happen. |
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If it is open, it will iterate the first point after the last point. |
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\ingroup views |
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*/ |
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template <typename Range, closure_selector Close> |
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struct closeable_view {}; |
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#ifndef DOXYGEN_NO_SPECIALIZATIONS |
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template <typename Range> |
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struct closeable_view<Range, closed> |
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{ |
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typedef identity_view<Range> type; |
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}; |
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template <typename Range> |
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struct closeable_view<Range, open> |
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{ |
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typedef detail::closing_view<Range> type; |
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}; |
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#endif // DOXYGEN_NO_SPECIALIZATIONS |
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}} // namespace boost::geometry |
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#endif // BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
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