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