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pw/var.hh
1 // Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_PW_VAR_HH
27 # define MLN_PW_VAR_HH
28 
34 # include <mln/core/concept/function.hh>
35 
36 
37 namespace mln
38 {
39 
40  // FIXME: Doc!
41 
42  namespace pw
43  {
44 
45  template <typename V>
46  struct var_ : public Function_v2v< var_<V> >
47  {
48  typedef V result;
49 
50  var_();
51 
52  var_(const V& v);
53 
54  template <typename P>
55  const V& operator()(const P&) const;
56 
57  private:
58  const V* v_;
59  };
60 
61 
62  template <typename V>
63  var_<V> var(const V& v);
64 
65 
66 # ifndef MLN_INCLUDE_ONLY
67 
68  // pw::var_<V>
69 
70  template <typename V>
71  inline
73  : v_(0)
74  {
75  }
76 
77  template <typename V>
78  inline
79  var_<V>::var_(const V& v)
80  : v_(&v)
81  {
82  }
83 
84  template <typename V>
85  template <typename P>
86  inline
87  const V&
88  var_<V>::operator()(const P&) const
89  {
90  mln_precondition(v_ != 0);
91  return *v_;
92  }
93 
94  // pw::var(v)
95 
96  template <typename V>
97  inline
98  var_<V> var(const V& v)
99  {
100  var_<V> tmp(v);
101  return tmp;
102  }
103 
104 # endif // ! MLN_INCLUDE_ONLY
105 
106  } // end of namespace mln::pw
107 
108 } // end of namespace mln
109 
110 
111 #endif // ! MLN_PW_VAR_HH