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value_like.hh
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26 
27 #ifndef MLN_VALUE_INTERNAL_VALUE_LIKE_HH
28 # define MLN_VALUE_INTERNAL_VALUE_LIKE_HH
29 
33 
34 # include <mln/core/concept/value.hh>
35 # include <mln/core/internal/force_exact.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace value
42  {
43 
44  namespace internal
45  {
46 
55  template < typename V, // Equivalent.
56  typename C, // Encoding.
57  typename N, // Interoperation.
58  typename E >
59  struct value_like_ // FIXME :Remove -> : public Value<E>
60  {
62  typedef V equiv;
63 
65  typedef C enc;
66 
68  typedef N interop;
69 
71  V to_equiv() const;
72 
74  const C& to_enc() const;
75 
77  N to_interop() const;
78 
79 
80  // Handle to encoding value.
81  C& handle_() { return v_; }
82 
83  protected:
84  enc v_;
85  };
86 
87 
91  template <typename V, typename C, typename N, typename E>
93 
94 
98  template <typename V, typename C, typename N, typename E>
99  bool operator<(const value_like_<V,C,N,E>& lhs, const value_like_<V,C,N,E>& rhs);
100 
101 
102 # ifndef MLN_INCLUDE_ONLY
103 
104  template <typename V, typename C, typename N, typename E>
105  inline
106  V
108  {
109  return v_;
110  }
111 
112  template <typename V, typename C, typename N, typename E>
113  inline
114  const C&
116  {
117  return v_;
118  }
119 
120  template <typename V, typename C, typename N, typename E>
121  inline
122  N
124  {
125  return static_cast<N>(mln::internal::force_exact<E>(*this));
126  }
127 
128  template <typename V, typename C, typename N, typename E>
129  inline
130  bool operator==(const value_like_<V,C,N,E>& lhs,
131  const value_like_<V,C,N,E>& rhs)
132  {
133  return lhs.to_enc() == rhs.to_enc();
134  }
135 
136  template <typename V, typename C, typename N, typename E>
137  inline
138  bool operator<(const value_like_<V,C,N,E>& lhs,
139  const value_like_<V,C,N,E>& rhs)
140  {
141  return lhs.to_interop() < rhs.to_interop(); // FIXME HERE: Why interop?
142  }
143 
144 # endif // ! MLN_INCLUDE_ONLY
145 
146  } // end of namespace mln::value::internal
147 
148  } // end of namespace mln::value
149 
150 } // end of namespace mln
151 
152 
153 #endif // ! MLN_VALUE_INTERNAL_VALUE_LIKE_HH