1 // Boost.Geometry (aka GGL, Generic Geometry Library) 2 3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. 4 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. 5 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. 6 7 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library 8 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. 9 10 // Use, modification and distribution is subject to the Boost Software License, 11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 12 // http://www.boost.org/LICENSE_1_0.txt) 13 14 #ifndef BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP 15 #define BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP 16 17 18 #include <boost/range.hpp> 19 20 #include <boost/geometry/core/closure.hpp> 21 #include <boost/geometry/core/ring_type.hpp> 22 #include <boost/geometry/core/tag.hpp> 23 #include <boost/geometry/core/tags.hpp> 24 #include <boost/geometry/iterators/closing_iterator.hpp> 25 26 #include <boost/geometry/views/identity_view.hpp> 27 28 namespace boost { namespace geometry 29 { 30 31 // Silence warning C4512: assignment operator could not be generated 32 #if defined(_MSC_VER) 33 #pragma warning(push) 34 #pragma warning(disable : 4512) 35 #endif 36 37 #ifndef DOXYGEN_NO_DETAIL 38 39 namespace detail 40 { 41 42 template <typename Range> 43 struct closing_view 44 { 45 // Keep this explicit, important for nested views/ranges closing_viewboost::geometry::detail::closing_view46 explicit inline closing_view(Range& r) 47 : m_range(r) 48 {} 49 50 typedef closing_iterator<Range> iterator; 51 typedef closing_iterator<Range const> const_iterator; 52 beginboost::geometry::detail::closing_view53 inline const_iterator begin() const { return const_iterator(m_range); } endboost::geometry::detail::closing_view54 inline const_iterator end() const { return const_iterator(m_range, true); } 55 beginboost::geometry::detail::closing_view56 inline iterator begin() { return iterator(m_range); } endboost::geometry::detail::closing_view57 inline iterator end() { return iterator(m_range, true); } 58 private : 59 Range& m_range; 60 }; 61 62 } 63 64 #endif // DOXYGEN_NO_DETAIL 65 66 67 /*! 68 \brief View on a range, either closing it or leaving it as it is 69 \details The closeable_view is used internally by the library to handle all rings, 70 either closed or open, the same way. The default method is closed, all 71 algorithms process rings as if they are closed. Therefore, if they are opened, 72 a view is created which closes them. 73 The closeable_view might be used by library users, but its main purpose is 74 internally. 75 \tparam Range Original range 76 \tparam Close Specifies if it the range is closed, if so, nothing will happen. 77 If it is open, it will iterate the first point after the last point. 78 \ingroup views 79 */ 80 template <typename Range, closure_selector Close> 81 struct closeable_view {}; 82 83 84 #ifndef DOXYGEN_NO_SPECIALIZATIONS 85 86 template <typename Range> 87 struct closeable_view<Range, closed> 88 { 89 typedef identity_view<Range> type; 90 }; 91 92 93 template <typename Range> 94 struct closeable_view<Range, open> 95 { 96 typedef detail::closing_view<Range> type; 97 }; 98 99 #endif // DOXYGEN_NO_SPECIALIZATIONS 100 101 102 #if defined(_MSC_VER) 103 #pragma warning(pop) 104 #endif 105 106 }} // namespace boost::geometry 107 108 109 #endif // BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP 110