// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2014-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, 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_ITERATORS_DETAIL_SEGMENT_ITERATOR_VALUE_TYPE_HPP
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#define BOOST_GEOMETRY_ITERATORS_DETAIL_SEGMENT_ITERATOR_VALUE_TYPE_HPP
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#include <iterator>
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#include <boost/geometry/geometries/segment.hpp>
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#include <boost/geometry/geometries/pointing_segment.hpp>
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#include <boost/geometry/iterators/point_iterator.hpp>
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#include <boost/geometry/util/type_traits_std.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 { namespace segment_iterator
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{
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template <typename Geometry>
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struct value_type
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{
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typedef typename std::iterator_traits
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<
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geometry::point_iterator<Geometry>
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>::reference point_iterator_reference_type;
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typedef typename detail::point_iterator::value_type
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<
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Geometry
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>::type point_iterator_value_type;
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// If the reference type of the point iterator is not really a
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// reference, then dereferencing a point iterator would create
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// a temporary object.
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// In this case using a pointing_segment to represent the
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// dereferenced value of the segment iterator cannot be used, as
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// it would store pointers to temporary objects. Instead we use a
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// segment, which does a full copy of the temporary objects
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// returned by the point iterator.
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typedef std::conditional_t
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<
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std::is_reference<point_iterator_reference_type>::value,
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geometry::model::pointing_segment<point_iterator_value_type>,
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geometry::model::segment
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<
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typename util::remove_cptrref
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<
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point_iterator_value_type
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>::type
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>
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> type;
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};
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}} // namespace detail::segment_iterator
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ITERATORS_DETAIL_SEGMENT_ITERATOR_VALUE_TYPE_HPP
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