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pw/value.hh
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25 
26 #ifndef MLN_PW_VALUE_HH
27 # define MLN_PW_VALUE_HH
28 
32 
33 # include <mln/fun/internal/selector.hh>
34 # include <mln/core/concept/image.hh>
35 
36 
37 
38 namespace mln
39 {
40 
41  namespace pw
42  {
43 
44 
45  // FIXME: Doc!
46 
47  template <typename I>
48  struct value_
49  : fun::internal::selector_from_result_< mln_value(I), value_<I> >::ret
50  {
51  typedef mln_value(I) result;
52 
53  value_();
54  value_(const I& ima);
55 
56  mln_rvalue(I) operator()(const mln_psite(I)& p) const;
57 
58  protected:
59  const I* ima_;
60  };
61 
62 
63 
64  // FIXME: Doc!
65 
66  template <typename I>
67  value_<I> value(const Image<I>& ima);
68 
69 
70 
71 # ifndef MLN_INCLUDE_ONLY
72 
73  // pw::value_<I>
74 
75  template <typename I>
76  inline
78  : ima_(0)
79  {
80  }
81 
82  template <typename I>
83  inline
84  value_<I>::value_(const I& ima)
85  : ima_(&ima)
86  {
87  }
88 
89  template <typename I>
90  inline
91  mln_rvalue(I)
92  value_<I>::operator()(const mln_psite(I)& p) const
93  {
94  mln_precondition(ima_ != 0);
95  mln_precondition(ima_->has(p));
96  return (*ima_)(p);
97  }
98 
99 
100  // pw::value(ima)
101 
102  template <typename I>
103  inline
104  value_<I>
105  value(const Image<I>& ima)
106  {
107  mln_precondition(exact(ima).is_valid());
108  value_<I> tmp(exact(ima));
109  return tmp;
110  }
111 
112 # endif // ! MLN_INCLUDE_ONLY
113 
114  } // end of namespace mln::pw
115 
116 } // end of namespace mln
117 
118 
119 #endif // ! MLN_PW_VALUE_HH