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param.hh
1 // Copyright (C) 2007, 2008, 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
4 //
5 // Olena is free software: you can redistribute it and/or modify it under
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7 // Software Foundation, version 2 of the License.
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12 // General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with Olena. If not, see <http://www.gnu.org/licenses/>.
16 //
17 // As a special exception, you may use this file as part of a free
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19 // instantiate templates or use macros or inline functions from this
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25 
26 #ifndef MLN_FUN_PARAM_HH
27 # define MLN_FUN_PARAM_HH
28 
29 namespace mln
30 {
31 
32  namespace fun
33  {
34 
35  template <typename T>
36  struct stored
37  {
38  typedef T value;
39 
40  const T& to_value() const
41  {
42  return t_;
43  }
44 
46  {
47  return t_;
48  }
49 
50  operator const T& () const
51  {
52  return to_value();
53  }
54 
55  operator T& ()
56  {
57  return to_value();
58  }
59 
60  stored& operator = (const T& t)
61  {
62  t_ = t;
63  return *this;
64  }
65 
66  protected:
67  T t_;
68  };
69 
70  template <>
71  struct stored<void>
72  {
73  };
74 
75  template <typename F>
76  struct parameter
77  {
78  typedef void param;
79  typedef void storage;
80  };
81 
82  } // end of namespace mln::fun
83 
84 } // end of namespace mln
85 
86 #endif // ! MLN_FUN_PARAM_HH