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fun/access/mean.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_FUN_ACCESS_MEAN_HH
27 # define MLN_FUN_ACCESS_MEAN_HH
28 
29 # include <mln/fun/unary.hh>
30 # include <mln/core/concept/accumulator.hh>
31 
32 
33 namespace mln
34 {
35 
36  namespace fun
37  {
38 
39  namespace access
40  {
41 
42  struct mean : unary<mean>
43  {
44  };
45 
46  namespace internal
47  {
48 
49  template <typename T>
50  struct method_mean
51  {
52  typedef method_mean ret;
53 
54  typedef typename T::mean_t result;
55  typedef T argument;
56 
57  static result read(const argument& x)
58  {
59  return x.mean();
60  }
61  };
62 
63  }
64 
65  } // end of namespace mln::access
66 
67  } // end of namespace mln
68 
69 
70  namespace trait
71  {
72 
73  namespace next
74  {
75 
76  template <typename A>
77  struct set_unary_< fun::access::mean,
78  Accumulator, A > : fun::access::internal::method_mean<A>
79  {
80  };
81 
82  } // end of namespace mln::trait::next
83 
84  } // end of namespace mln::trait
85 
86 } // end of namespace mln
87 
88 
89 #endif // ! MLN_FUN_ACCESS_MEAN_HH