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