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mln/value/internal/convert.hh
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25 
26 #ifndef MLN_VALUE_INTERNAL_CONVERT_HH
27 # define MLN_VALUE_INTERNAL_CONVERT_HH
28 
32 
33 # include <mln/core/contract.hh>
34 # include <mln/trait/value_.hh>
35 
36 
37 namespace mln
38 {
39 
40  namespace value
41  {
42 
43  namespace internal
44  {
46  template <typename T>
47  struct convert_
48  {
49  // FIXME: Check that we have a type T compatible with 'int'.
50 
51  static T value_at_index(unsigned i);
52  static unsigned index_of_value(const T& v);
53  };
54 
56  template <>
57  struct convert_<bool>
58  {
59  static bool value_at_index(unsigned i);
60  static unsigned index_of_value(bool v);
61  };
62 
63 
64 # ifndef MLN_INCLUDE_ONLY
65 
66  template <typename T>
67  inline
68  T
69  convert_<T>::value_at_index(unsigned i)
70  {
71  return T( int(mln_min(T)) + int(i) );
72  }
73 
74  template <typename T>
75  inline
76  unsigned
78  {
79  return unsigned( int(v) - int(mln_min(T)) );
80  }
81 
82  // Case of 'bool'.
83 
84  inline
85  bool
87  {
88  mln_precondition(i < 2);
89  return i == 1 ? true : false;
90  }
91 
92  inline
93  unsigned
95  {
96  return v ? 1 : 0;
97  }
98 
99 # endif // ! MLN_INCLUDE_ONLY
100 
101  } // end of namespace mln::value::internal
102 
103  } // end of namespace mln::value
104 
105 } // end of namespace mln
106 
107 
108 #endif // ! MLN_VALUE_INTERNAL_CONVERT_HH