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always_true.hh
1 // Copyright (C) 2013 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
4 //
5 // Olena is free software: you can redistribute it and/or modify it under
6 // the terms of the GNU General Public License as published by the Free
7 // Software Foundation, version 2 of the License.
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19 // instantiate templates or use macros or inline functions from this
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25 
26 #ifndef MLN_FUN_V2V_ALWAYS_TRUE_HH
27 # define MLN_FUN_V2V_ALWAYS_TRUE_HH
28 
32 
33 # include <mln/core/concept/function.hh>
34 
35 
36 namespace mln
37 {
38 
39  namespace fun
40  {
41 
42  namespace v2b
43  {
44 
46  template <typename V>
47  struct always_true : public Function_v2b< always_true<V> >
48  {
49  typedef bool result;
50  typedef V argument;
51 
52  bool operator()(const V&) const;
53  };
54 
55 
56 # ifndef MLN_INCLUDE_ONLY
57 
58  template <typename V>
59  bool
60  always_true<V>::operator()(const V&) const
61  {
62  return true;
63  }
64 
65 # endif // ! MLN_INCLUDE_ONLY
66 
67  } // end of namespace mln::fun::v2b
68 
69  } // end of namespace mln::fun
70 
71 } // end of namespace mln
72 
73 
74 #endif // ! MLN_FUN_V2V_ALWAYS_TRUE_HH