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value_at_index.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_FUN_I2V_VALUE_AT_INDEX_HH
27 # define MLN_FUN_I2V_VALUE_AT_INDEX_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 i2v
44  {
45 
46  template <typename T>
47  struct value_at_index : Function_v2v< value_at_index<T> >,
48  private metal::bool_<(mln_dim(T) == 1)>::check_t
49  {
50  typedef T result;
51  T operator()(unsigned i) const;
52  };
53 
54  template <>
55  struct value_at_index<bool> : Function_v2v< value_at_index<bool> >
56  {
57  typedef bool result;
58  bool operator()(unsigned i) const;
59  };
60 
61 
62 # ifndef MLN_INCLUDE_ONLY
63 
64  template <typename T>
65  inline
66  T
67  value_at_index<T>::operator()(unsigned i) const
68  {
69  return T( int(mln_min(T)) + int(i) );
70  }
71 
72  inline
73  bool
74  value_at_index<bool>::operator()(unsigned i) const
75  {
76  mln_precondition(i < 2);
77  return i == 1u ? true : false;
78  }
79 
80 # endif // ! MLN_INCLUDE_ONLY
81 
82  } // end of namespace mln::fun::i2v
83 
84  } // end of namespace mln::fun
85 
86 } // end of namespace mln
87 
88 #endif // ! MLN_FUN_I2V_VALUE_AT_INDEX_HH