projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
| 2 | ||
| 3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
| 4 | ||
| 5 | // This file was modified by Oracle on 2013, 2014. | |
| 6 | // Modifications copyright (c) 2013-2014, Oracle and/or its affiliates. | |
| 7 | ||
| 8 | // Use, modification and distribution is subject to the Boost Software License, | |
| 9 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
| 10 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 11 | ||
| 12 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle | |
| 13 | ||
| 14 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP | |
| 15 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP | |
| 16 | ||
| 17 | #include <boost/mpl/if.hpp> | |
| 18 | #include <boost/type_traits/is_base_of.hpp> | |
| 19 | ||
| 20 | #include <boost/geometry/core/assert.hpp> | |
| 21 | #include <boost/geometry/core/tag.hpp> | |
| 22 | #include <boost/geometry/util/range.hpp> | |
| 23 | ||
| 24 | namespace boost { namespace geometry { | |
| 25 | ||
| 26 | #ifndef DOXYGEN_NO_DISPATCH | |
| 27 | namespace detail_dispatch { | |
| 28 | ||
| 29 | // Returns single geometry by Id | |
| 30 | // for single geometries returns the geometry itself | |
| 31 | template <typename Geometry, | |
| 32 | bool IsMulti = boost::is_base_of | |
| 33 | < | |
| 34 | multi_tag, | |
| 35 | typename geometry::tag<Geometry>::type | |
| 36 | >::value | |
| 37 | > | |
| 38 | struct single_geometry | |
| 39 | { | |
| 40 | typedef Geometry & return_type; | |
| 41 | ||
| 42 | template <typename Id> | |
| 43 | static inline return_type apply(Geometry & g, Id const& ) { return g; } | |
| 44 | }; | |
| 45 | ||
| 46 | // for multi geometries returns one of the stored single geometries | |
| 47 | template <typename Geometry> | |
| 48 | struct single_geometry<Geometry, true> | |
| 49 | { | |
| 50 | typedef typename boost::range_reference<Geometry>::type return_type; | |
| 51 | ||
| 52 | template <typename Id> | |
| 53 | static inline return_type apply(Geometry & g, Id const& id) | |
| 54 | { | |
| 55 | BOOST_GEOMETRY_ASSERT(id.multi_index >= 0); | |
| 56 | typedef typename boost::range_size<Geometry>::type size_type; | |
| 57 | return range::at(g, static_cast<size_type>(id.multi_index)); | |
| 58 | } | |
| 59 | }; | |
| 60 | ||
| 61 | } // namespace detail_dispatch | |
| 62 | #endif // DOXYGEN_NO_DISPATCH | |
| 63 | ||
| 64 | #ifndef DOXYGEN_NO_DETAIL | |
| 65 | namespace detail { | |
| 66 | ||
| 67 | template <typename Geometry> | |
| 68 | struct single_geometry_return_type | |
| 69 | { | |
| 70 | typedef typename detail_dispatch::single_geometry<Geometry>::return_type type; | |
| 71 | }; | |
| 72 | ||
| 73 | template <typename Geometry, typename Id> | |
| 74 | inline | |
| 75 | typename single_geometry_return_type<Geometry>::type | |
| 76 | single_geometry(Geometry & geometry, Id const& id) | |
| 77 | { | |
| 78 | return detail_dispatch::single_geometry<Geometry>::apply(geometry, id); | |
| 79 | } | |
| 80 | ||
| 81 | template <typename Geometry, typename Id> | |
| 82 | inline | |
| 83 | typename single_geometry_return_type<Geometry const>::type | |
| 84 | single_geometry(Geometry const& geometry, Id const& id) | |
| 85 | { | |
| 86 | return detail_dispatch::single_geometry<Geometry const>::apply(geometry, id); | |
| 87 | } | |
| 88 | ||
| 89 | } // namespace detail | |
| 90 | #endif // DOXYGEN_NO_DETAIL | |
| 91 | ||
| 92 | }} // namespace boost::geometry | |
| 93 | ||
| 94 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_SINGLE_GEOMETRY_HPP |