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second.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
4 //
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7 // Software Foundation, version 2 of the License.
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25 
26 #ifndef MLN_FUN_META_SECOND_HH
27 # define MLN_FUN_META_SECOND_HH
28 
32 
33 # include <mln/fun/meta/impl.hh>
34 # include <mln/util/couple.hh>
35 
36 namespace mln
37 {
38 
39  namespace meta
40  {
41 
42  template <class T>
43  struct second : impl< second<T> >
44  {
45  typedef T value;
46  };
47 
48  } // end of namespace mln::meta
49 
50 
51  template <typename T, typename U>
52  struct function< meta::second< util::couple<T,U> > >
53  : public Function_v2v<function< meta::second < util::couple<T,U> > > >
54  {
55  typedef util::couple<T,U> value;
56 
57  typedef T result;
58  result read(const value& c);
59 
60  typedef result& lresult;
61  lresult write(value& c);
62  };
63 
64 
65 # ifndef MLN_INCLUDE_ONLY
66 
67 
68  template <typename T, typename U>
69  inline
70  typename function< meta::second< util::couple<T,U> > >::result
71  function< meta::second< util::couple<T,U> > >::read(const value& c)
72  {
73  return c.second();
74  }
75 
76  template <typename T, typename U>
77  inline
78  typename function< meta::second< util::couple<T,U> > >::lresult
79  function< meta::second< util::couple<T,U> > >::write(value& c)
80  {
81  return c.second();
82  }
83 
84 
85 # endif // ! MLN_INCLUDE_ONLY
86 
87 
88 } // end of namespace mln
89 
90 #endif // ! MLN_FUN_META_SECOND_HH