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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 |