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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2013, 2014.
// Modifications copyright (c) 2013-2014, Oracle and/or its affiliates.
// 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)
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_base_of.hpp>
#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 = boost::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