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index_of_value.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_FUN_V2I_INDEX_OF_VALUE_HH
27 # define MLN_FUN_V2I_INDEX_OF_VALUE_HH
28 
32 
33 # include <mln/core/concept/function.hh>
34 # include <mln/trait/value_.hh>
35 
36 
37 namespace mln
38 {
39 
40  namespace fun
41  {
42 
43  namespace v2i
44  {
45 
46  template <typename T>
47  struct index_of_value : Function_v2v< index_of_value<T> >,
48  private metal::bool_<(mln_dim(T) == 1)>::check_t
49  {
50  typedef unsigned result;
51  unsigned operator()(const T& v) const;
52  };
53 
54  template <>
55  struct index_of_value<bool> : Function_v2v< index_of_value<bool> >
56  {
57  typedef unsigned result;
58  unsigned operator()(bool b) const;
59  };
60 
61  template <typename T>
62  unsigned
63  meta_index_of_value(const T& v);
64 
65 
66 # ifndef MLN_INCLUDE_ONLY
67 
68  template <typename T>
69  inline
70  unsigned
71  index_of_value<T>::operator()(const T& v) const
72  {
73  return unsigned( int(v) - int(mln_min(T)) );
74  }
75 
76  inline
77  unsigned index_of_value<bool>::operator()(bool b) const
78  {
79  return b ? 1u : 0u;
80  }
81 
82  template <typename T>
83  inline
84  unsigned
85  meta_index_of_value(const T& v)
86  {
87  index_of_value<T> f;
88  return f(v);
89  }
90 
91 # endif // ! MLN_INCLUDE_ONLY
92 
93  } // end of namespace mln::fun::v2i
94 
95  } // end of namespace mln::fun
96 
97 } // end of namespace mln
98 
99 #endif // ! MLN_FUN_V2I_INDEX_OF_VALUE_HH