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id2element.hh
1 // Copyright (C) 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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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_UTIL_INTERNAL_ID2ELEMENT_HH
27 # define MLN_UTIL_INTERNAL_ID2ELEMENT_HH
28 
32 
33 #include <mln/core/concept/graph.hh>
34 #include <mln/core/concept/function.hh>
35 
36 namespace mln
37 {
38 
39  namespace util
40  {
41 
42  namespace internal
43  {
44 
45  template <typename G, typename Elt>
46  struct id2element : Function_v2v< id2element<G,Elt> >
47  {
48  typedef Elt result;
49 
50  id2element();
51  id2element(const Graph<G>& g);
52  Elt operator()(unsigned id) const;
53 
54  G g_;
55  };
56 
57 
58 # ifndef MLN_INCLUDE_ONLY
59 
60  template <typename G, typename Elt>
61  inline
63  {
64  }
65 
66  template <typename G, typename Elt>
67  inline
69  : g_(exact(g))
70  {
71  }
72 
73  template <typename G, typename Elt>
74  inline
75  Elt
76  id2element<G,Elt>::operator()(unsigned id) const
77  {
78  mln_assertion(g_.is_valid());
79  mln_assertion(g_.has(Elt(g_,id)));
83  return Elt(g_, id);
84  }
85 
86 
87 # endif // ! MLN_INCLUDE_ONLY
88 
89 
90  } // end of namespace mln::util::internal
91 
92  } // end of namespace mln::util
93 
94 } // end of namespace mln
95 
96 
97 #endif // ! MLN_UTIL_INTERNAL_ID2ELEMENT_HH