views/detail/geometry_collection_view.hpp

0001 // Boost.Geometry
0002
0003 // Copyright (c) 2022, Oracle and/or its affiliates.
0004
0005 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
0006
0007 // Licensed under the Boost Software License version 1.0.
0008 // http://www.boost.org/users/license.html
0009
0010 #ifndef BOOST_GEOMETRY_VIEWS_GEOMETRY_COLLECTION_VIEW_HPP
0011 #define BOOST_GEOMETRY_VIEWS_GEOMETRY_COLLECTION_VIEW_HPP
0012
0013 #include <boost/core/addressof.hpp>
0014
0015 #include <boost/geometry/core/geometry_types.hpp>
0016 #include <boost/geometry/core/tag.hpp>
0017 #include <boost/geometry/core/tags.hpp>
0018 #include <boost/geometry/core/visit.hpp>
0019 #include <boost/geometry/util/sequence.hpp>
0020
0021 namespace boost { namespace geometry
0022 {
0023
0024 namespace detail
0025 {
0026
0027
0028 template <typename Geometry>
0029 class geometry_collection_view
0030 {
0031 public:
0032     using iterator = Geometry const*;
0033     using const_iterator = Geometry const*;
0034
0035     explicit geometry_collection_view(Geometry const& geometry)
0036         : m_geometry(geometry)
0037     {}
0038
0039     const_iterator begin() const { return boost::addressof(m_geometry); }
0040     const_iterator end() const { return boost::addressof(m_geometry) + 1; }
0041
0042 private:
0043     Geometry const& m_geometry;
0044 };
0045
0046 } // namespace detail
0047
0048
0049 #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
0050 namespace traits
0051 {
0052
0053 template <typename Geometry>
0054 struct tag<geometry::detail::geometry_collection_view<Geometry>>
0055 {
0056     using type = geometry_collection_tag;
0057 };
0058
0059
0060 template <typename Geometry>
0061 struct geometry_types<geometry::detail::geometry_collection_view<Geometry>>
0062 {
0063     using type = util::type_sequence<Geometry>;
0064 };
0065
0066
0067 template <typename Geometry>
0068 struct iter_visit<geometry::detail::geometry_collection_view<Geometry>>
0069 {
0070     template <typename Function, typename Iterator>
0071     static void apply(Function && function, Iterator iterator)
0072     {
0073         function(*iterator);
0074     }
0075 };
0076
0077
0078 } // namespace traits
0079 #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
0080
0081
0082 }} // namespace boost::geometry
0083
0084 #endif // BOOST_GEOMETRY_VIEWS_GEOMETRY_COLLECTION_VIEW_HPP