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Added thirdparty: boost library
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Viacheslav Demydiuk
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// Boost.Geometry
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// Copyright (c) 2022-2023, Oracle and/or its affiliates.
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// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_VIEWS_DETAIL_RANDOM_ACCESS_VIEW_HPP
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#define BOOST_GEOMETRY_VIEWS_DETAIL_RANDOM_ACCESS_VIEW_HPP
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#include <vector>
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/iterator.hpp>
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#include <boost/range/size.hpp>
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#include <boost/geometry/algorithms/detail/visit.hpp>
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#include <boost/geometry/core/geometry_types.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/util/sequence.hpp>
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#include <boost/geometry/util/type_traits.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 is_random_access_range
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: std::is_convertible
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<
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typename boost::iterator_traversal
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<
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typename boost::range_iterator<Range>::type
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>::type,
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boost::random_access_traversal_tag
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>
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{};
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template <typename Geometry>
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struct is_geometry_collection_recursive
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: util::bool_constant
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<
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util::is_geometry_collection
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<
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typename util::sequence_find_if
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<
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typename traits::geometry_types<std::remove_const_t<Geometry>>::type,
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util::is_geometry_collection
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>::type
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>::value
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>
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{};
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template
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<
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typename GeometryCollection,
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bool IsRandomAccess = is_random_access_range<GeometryCollection>::value,
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bool IsRecursive = is_geometry_collection_recursive<GeometryCollection>::value
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>
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class random_access_view
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: public std::vector<typename boost::range_iterator<GeometryCollection>::type>
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{
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// NOTE: An alternative would be to implement iterator holding base iterators
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// to geometry collections of lower levels to process after the current level
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// of bfs traversal is finished.
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using base_t = std::vector<typename boost::range_iterator<GeometryCollection>::type>;
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public:
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random_access_view(GeometryCollection & geometry)
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{
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this->reserve(boost::size(geometry));
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detail::visit_breadth_first_impl<true>::apply([&](auto&&, auto iter)
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{
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this->push_back(iter);
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return true;
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}, geometry);
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}
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};
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template <typename GeometryCollection>
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class random_access_view<GeometryCollection, true, false>
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{
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public:
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using iterator = typename boost::range_iterator<GeometryCollection>::type;
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using const_iterator = typename boost::range_const_iterator<GeometryCollection>::type;
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random_access_view(GeometryCollection & geometry)
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: m_begin(boost::begin(geometry))
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, m_end(boost::end(geometry))
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{}
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iterator begin() { return m_begin; }
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iterator end() { return m_end; }
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const_iterator begin() const { return m_begin; }
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const_iterator end() const { return m_end; }
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private:
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iterator m_begin, m_end;
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};
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template <typename GeometryCollection>
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struct random_access_view_iter_visit
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{
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template <typename Function, typename Iterator>
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static void apply(Function && function, Iterator iterator)
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{
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geometry::traits::iter_visit
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<
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std::remove_const_t<GeometryCollection>
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>::apply(std::forward<Function>(function), *iterator);
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}
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};
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template <typename ...Ts>
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struct remove_geometry_collections_pack
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{
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using type = util::type_sequence<>;
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};
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template <typename T, typename ...Ts>
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struct remove_geometry_collections_pack<T, Ts...>
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{
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using next_sequence = typename remove_geometry_collections_pack<Ts...>::type;
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using type = std::conditional_t
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<
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util::is_geometry_collection<T>::value,
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next_sequence,
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typename util::sequence_merge<util::type_sequence<T>, next_sequence>::type
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>;
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};
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template <typename Types>
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struct remove_geometry_collections;
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template <typename ...Ts>
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struct remove_geometry_collections<util::type_sequence<Ts...>>
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: remove_geometry_collections_pack<Ts...>
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{};
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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namespace traits
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{
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template<typename GeometryCollection, bool IsRandomAccess, bool IsRecursive>
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struct tag<geometry::detail::random_access_view<GeometryCollection, IsRandomAccess, IsRecursive>>
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{
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using type = geometry_collection_tag;
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};
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template <typename GeometryCollection>
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struct iter_visit<geometry::detail::random_access_view<GeometryCollection, false, false>>
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: geometry::detail::random_access_view_iter_visit<GeometryCollection>
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{};
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template <typename GeometryCollection>
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struct iter_visit<geometry::detail::random_access_view<GeometryCollection, true, true>>
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: geometry::detail::random_access_view_iter_visit<GeometryCollection>
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{};
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template <typename GeometryCollection>
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struct iter_visit<geometry::detail::random_access_view<GeometryCollection, false, true>>
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: geometry::detail::random_access_view_iter_visit<GeometryCollection>
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{};
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template <typename GeometryCollection>
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struct iter_visit<geometry::detail::random_access_view<GeometryCollection, true, false>>
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{
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template <typename Function, typename Iterator>
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static void apply(Function && function, Iterator iterator)
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{
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geometry::traits::iter_visit
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<
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std::remove_const_t<GeometryCollection>
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>::apply(std::forward<Function>(function), iterator);
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}
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};
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template <typename GeometryCollection, bool IsRandomAccess>
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struct geometry_types<geometry::detail::random_access_view<GeometryCollection, IsRandomAccess, false>>
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: traits::geometry_types
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<
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std::remove_const_t<GeometryCollection>
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>
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{};
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template <typename GeometryCollection, bool IsRandomAccess>
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struct geometry_types<geometry::detail::random_access_view<GeometryCollection, IsRandomAccess, true>>
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: geometry::detail::remove_geometry_collections
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<
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typename traits::geometry_types
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<
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std::remove_const_t<GeometryCollection>
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>::type
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>
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{};
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} // namespace traits
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#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_VIEWS_DETAIL_RANDOM_ACCESS_VIEW_HPP
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