// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
|
|
// This file was modified by Oracle on 2013-2020.
|
// Modifications copyright (c) 2013-2020, Oracle and/or its affiliates.
|
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
|
|
// Use, modification and distribution is subject to the Boost Software License,
|
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
|
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
|
|
#include <type_traits>
|
|
#include <boost/geometry/core/assert.hpp>
|
#include <boost/geometry/core/tag.hpp>
|
#include <boost/geometry/util/range.hpp>
|
|
namespace boost { namespace geometry {
|
|
#ifndef DOXYGEN_NO_DISPATCH
|
namespace detail_dispatch {
|
|
// Returns single geometry by Id
|
// for single geometries returns the geometry itself
|
template
|
<
|
typename Geometry,
|
bool IsMulti = std::is_base_of
|
<
|
multi_tag,
|
typename geometry::tag<Geometry>::type
|
>::value
|
>
|
struct single_geometry
|
{
|
typedef Geometry & return_type;
|
|
template <typename Id>
|
static inline return_type apply(Geometry & g, Id const& ) { return g; }
|
};
|
|
// for multi geometries returns one of the stored single geometries
|
template <typename Geometry>
|
struct single_geometry<Geometry, true>
|
{
|
typedef typename boost::range_reference<Geometry>::type return_type;
|
|
template <typename Id>
|
static inline return_type apply(Geometry & g, Id const& id)
|
{
|
BOOST_GEOMETRY_ASSERT(id.multi_index >= 0);
|
typedef typename boost::range_size<Geometry>::type size_type;
|
return range::at(g, static_cast<size_type>(id.multi_index));
|
}
|
};
|
|
} // namespace detail_dispatch
|
#endif // DOXYGEN_NO_DISPATCH
|
|
#ifndef DOXYGEN_NO_DETAIL
|
namespace detail {
|
|
template <typename Geometry>
|
struct single_geometry_return_type
|
{
|
typedef typename detail_dispatch::single_geometry<Geometry>::return_type type;
|
};
|
|
template <typename Geometry, typename Id>
|
inline
|
typename single_geometry_return_type<Geometry>::type
|
single_geometry(Geometry & geometry, Id const& id)
|
{
|
return detail_dispatch::single_geometry<Geometry>::apply(geometry, id);
|
}
|
|
template <typename Geometry, typename Id>
|
inline
|
typename single_geometry_return_type<Geometry const>::type
|
single_geometry(Geometry const& geometry, Id const& id)
|
{
|
return detail_dispatch::single_geometry<Geometry const>::apply(geometry, id);
|
}
|
|
} // namespace detail
|
#endif // DOXYGEN_NO_DETAIL
|
|
}} // namespace boost::geometry
|
|
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
|
