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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 | |
46 | 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 | ||
53 | inline const_iterator begin() const { return const_iterator(m_range); } | |
54 | inline const_iterator end() const { return const_iterator(m_range, true); } | |
55 | ||
56 | inline iterator begin() { return iterator(m_range); } | |
57 | 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 |