ceph/src/boost/boost/geometry/views/closeable_view.hpp

   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 // This file was modified by Oracle on 2020.
   8 // Modifications copyright (c) 2020 Oracle and/or its affiliates.
   9 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  10
  11 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  12 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  13
  14 // Use, modification and distribution is subject to the Boost Software License,
  15 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  16 // http://www.boost.org/LICENSE_1_0.txt)
  17
  18 #ifndef BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
  19 #define BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP
  20
  21 #include <boost/geometry/core/closure.hpp>
  22 #include <boost/geometry/core/ring_type.hpp>
  23 #include <boost/geometry/core/tag.hpp>
  24 #include <boost/geometry/core/tags.hpp>
  25 #include <boost/geometry/iterators/closing_iterator.hpp>
  26
  27 #include <boost/geometry/views/identity_view.hpp>
  28
  29 namespace boost { namespace geometry
  30 {
  31
  32 // Silence warning C4512: assignment operator could not be generated
  33 #if defined(_MSC_VER)
  34 #pragma warning(push)
  35 #pragma warning(disable : 4512)
  36 #endif
  37
  38 #ifndef DOXYGEN_NO_DETAIL
  39
  40 namespace detail
  41 {
  42
  43 template <typename Range>
  44 struct closing_view
  45 {
  46     // Keep this explicit, important for nested views/ranges
  47     explicit inline closing_view(Range& r)
  48         : m_range(r)
  49     {}
  50
  51     typedef closing_iterator<Range> iterator;
  52     typedef closing_iterator<Range const> const_iterator;
  53
  54     inline const_iterator begin() const { return const_iterator(m_range); }
  55     inline const_iterator end() const { return const_iterator(m_range, true); }
  56
  57     inline iterator begin() { return iterator(m_range); }
  58     inline iterator end() { return iterator(m_range, true); }
  59 private :
  60     Range& m_range;
  61 };
  62
  63 }
  64
  65 #endif // DOXYGEN_NO_DETAIL
  66
  67
  68 /*!
  69 \brief View on a range, either closing it or leaving it as it is
  70 \details The closeable_view is used internally by the library to handle all rings,
  71     either closed or open, the same way. The default method is closed, all
  72     algorithms process rings as if they are closed. Therefore, if they are opened,
  73     a view is created which closes them.
  74     The closeable_view might be used by library users, but its main purpose is
  75     internally.
  76 \tparam Range Original range
  77 \tparam Close Specifies if it the range is closed, if so, nothing will happen.
  78     If it is open, it will iterate the first point after the last point.
  79 \ingroup views
  80 */
  81 template <typename Range, closure_selector Close>
  82 struct closeable_view {};
  83
  84
  85 #ifndef DOXYGEN_NO_SPECIALIZATIONS
  86
  87 template <typename Range>
  88 struct closeable_view<Range, closed>
  89 {
  90     typedef identity_view<Range> type;
  91 };
  92
  93
  94 template <typename Range>
  95 struct closeable_view<Range, open>
  96 {
  97     typedef detail::closing_view<Range> type;
  98 };
  99
 100 #endif // DOXYGEN_NO_SPECIALIZATIONS
 101
 102
 103 #if defined(_MSC_VER)
 104 #pragma warning(pop)
 105 #endif
 106
 107 }} // namespace boost::geometry
 108
 109
 110 #endif // BOOST_GEOMETRY_VIEWS_CLOSEABLE_VIEW_HPP