1 // Boost.Geometry (aka GGL, Generic Geometry Library)
2 
3 // Copyright (c) 2015, Oracle and/or its affiliates.
4 
5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
6 
7 // Licensed under the Boost Software License version 1.0.
8 // http://www.boost.org/users/license.html
9 
10 #ifndef BOOST_GEOMETRY_POLICIES_IS_VALID_FAILURE_TYPE_POLICY_HPP
11 #define BOOST_GEOMETRY_POLICIES_IS_VALID_FAILURE_TYPE_POLICY_HPP
12 
13 #include <boost/geometry/algorithms/validity_failure_type.hpp>
14 
15 
16 namespace boost { namespace geometry
17 {
18 
19 
20 // policy that simply keeps (and can return) the failure type
21 template <bool AllowDuplicates = true, bool AllowSpikes = true>
22 class failure_type_policy
23 {
24 private:
25     static inline
transform_failure_type(validity_failure_type failure)26     validity_failure_type transform_failure_type(validity_failure_type failure)
27     {
28         if (AllowDuplicates && failure == failure_duplicate_points)
29         {
30             return no_failure;
31         }
32         return failure;
33     }
34 
35     static inline
transform_failure_type(validity_failure_type failure,bool is_linear)36     validity_failure_type transform_failure_type(validity_failure_type failure,
37                                                  bool is_linear)
38     {
39         if (is_linear && AllowSpikes && failure == failure_spikes)
40         {
41             return no_failure;
42         }
43         return transform_failure_type(failure);
44     }
45 
46 public:
failure_type_policy()47     failure_type_policy()
48         : m_failure(no_failure)
49     {}
50 
51     template <validity_failure_type Failure>
apply()52     inline bool apply()
53     {
54         m_failure = transform_failure_type(Failure);
55         return m_failure == no_failure;
56     }
57 
58     template <validity_failure_type Failure, typename Data>
apply(Data const &)59     inline bool apply(Data const&)
60     {
61         return apply<Failure>();
62     }
63 
64     template <validity_failure_type Failure, typename Data1, typename Data2>
apply(Data1 const & data1,Data2 const &)65     inline bool apply(Data1 const& data1, Data2 const&)
66     {
67         m_failure = transform_failure_type(Failure, data1);
68         return m_failure == no_failure;
69     }
70 
failure() const71     validity_failure_type failure() const
72     {
73         return m_failure;
74     }
75 
76 private:
77     validity_failure_type m_failure;
78 };
79 
80 
81 }} // namespace boost::geometry
82 
83 #endif // BOOST_GEOMETRY_POLICIES_IS_VALID_FAILURE_TYPE_POLICY_HPP
84