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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. | |
5 | // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. | |
6 | ||
7 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
8 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
9 | ||
10 | // Use, modification and distribution is subject to the Boost Software License, | |
11 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
12 | // http://www.boost.org/LICENSE_1_0.txt) | |
13 | ||
14 | #ifndef BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP | |
15 | #define BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP | |
16 | ||
17 | ||
18 | #include <boost/concept_check.hpp> | |
19 | ||
20 | ||
21 | namespace boost { namespace geometry { namespace concepts | |
22 | { | |
23 | ||
24 | ||
25 | /*! | |
26 | \brief Checks strategy for area | |
27 | \ingroup area | |
28 | */ | |
29 | template <typename Strategy> | |
30 | class AreaStrategy | |
31 | { | |
32 | #ifndef DOXYGEN_NO_CONCEPT_MEMBERS | |
33 | ||
34 | // 1) must define state_type, | |
35 | typedef typename Strategy::state_type state_type; | |
36 | ||
37 | // 2) must define return_type, | |
38 | typedef typename Strategy::return_type return_type; | |
39 | ||
40 | // 3) must define point_type, of polygon (segments) | |
41 | typedef typename Strategy::segment_point_type spoint_type; | |
42 | ||
43 | struct check_methods | |
44 | { | |
45 | static void apply() | |
46 | { | |
47 | Strategy const* str = 0; | |
48 | state_type *st = 0; | |
49 | ||
50 | // 4) must implement a method apply with the following signature | |
51 | spoint_type const* sp = 0; | |
52 | str->apply(*sp, *sp, *st); | |
53 | ||
54 | // 5) must implement a static method result with the following signature | |
55 | return_type r = str->result(*st); | |
56 | ||
57 | boost::ignore_unused_variable_warning(r); | |
58 | boost::ignore_unused_variable_warning(str); | |
59 | } | |
60 | }; | |
61 | ||
62 | public : | |
63 | BOOST_CONCEPT_USAGE(AreaStrategy) | |
64 | { | |
65 | check_methods::apply(); | |
66 | } | |
67 | ||
68 | #endif | |
69 | }; | |
70 | ||
71 | ||
72 | }}} // namespace boost::geometry::concepts | |
73 | ||
74 | ||
75 | #endif // BOOST_GEOMETRY_STRATEGIES_CONCEPTS_AREA_CONCEPT_HPP |