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_SIMPLIFY_CONCEPT_HPP
15 #define BOOST_GEOMETRY_STRATEGIES_CONCEPTS_SIMPLIFY_CONCEPT_HPP
16 
17 #include <vector>
18 #include <iterator>
19 
20 #include <boost/concept_check.hpp>
21 #include <boost/core/ignore_unused.hpp>
22 
23 #include <boost/geometry/geometries/point.hpp>
24 #include <boost/geometry/strategies/concepts/distance_concept.hpp>
25 
26 
27 namespace boost { namespace geometry { namespace concepts
28 {
29 
30 
31 /*!
32     \brief Checks strategy for simplify
33     \ingroup simplify
34 */
35 template <typename Strategy, typename Point>
36 struct SimplifyStrategy
37 {
38 #ifndef DOXYGEN_NO_CONCEPT_MEMBERS
39 private :
40 
41     // 1) must define distance_strategy_type,
42     //    defining point-segment distance strategy (to be checked)
43     typedef typename Strategy::distance_strategy_type ds_type;
44 
45 
46     struct checker
47     {
48         template <typename ApplyMethod>
applyboost::geometry::concepts::SimplifyStrategy::checker49         static void apply(ApplyMethod)
50         {
51             namespace ft = boost::function_types;
52             typedef typename ft::parameter_types
53                 <
54                     ApplyMethod
55                 >::type parameter_types;
56 
57             typedef typename boost::mpl::if_
58                 <
59                     ft::is_member_function_pointer<ApplyMethod>,
60                     boost::mpl::int_<1>,
61                     boost::mpl::int_<0>
62                 >::type base_index;
63 
64             BOOST_CONCEPT_ASSERT
65                 (
66                     (concepts::PointSegmentDistanceStrategy<ds_type, Point, Point>)
67                 );
68 
69             Strategy *str = 0;
70             std::vector<Point> const* v1 = 0;
71             std::vector<Point> * v2 = 0;
72 
73             // 2) must implement method apply with arguments
74             //    - Range
75             //    - OutputIterator
76             //    - floating point value
77             str->apply(*v1, std::back_inserter(*v2), 1.0);
78 
79             boost::ignore_unused<parameter_types, base_index>();
80             boost::ignore_unused(str);
81         }
82     };
83 
84 public :
BOOST_CONCEPT_USAGEboost::geometry::concepts::SimplifyStrategy85     BOOST_CONCEPT_USAGE(SimplifyStrategy)
86     {
87         checker::apply(&ds_type::template apply<Point, Point>);
88     }
89 #endif
90 };
91 
92 
93 
94 }}} // namespace boost::geometry::concepts
95 
96 #endif // BOOST_GEOMETRY_STRATEGIES_CONCEPTS_SIMPLIFY_CONCEPT_HPP
97