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find_root_fastest.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_CANVAS_LABELING_INTERNAL_FIND_ROOT_FASTEST_HH
27 # define MLN_CANVAS_LABELING_INTERNAL_FIND_ROOT_FASTEST_HH
28 
32 
33 namespace mln
34 {
35 
36  namespace canvas
37  {
38 
39  namespace labeling
40  {
41 
42  namespace internal
43  {
44 
45  template <typename I>
46  unsigned
47  find_root_fastest(I& parent, unsigned x);
48 
49 # ifndef MLN_INCLUDE_ONLY
50 
51 
52  template <typename I>
53  inline
54  unsigned
55  find_root_fastest(I& parent, unsigned x)
56  {
57  if (parent.element(x) == x)
58  return x;
59  else
60  return parent.element(x) = find_root_fastest(parent,
61  parent.element(x));
62  }
63 
64 # endif // ! MLN_INCLUDE_ONLY
65 
66  } // end of namespace mln::canvas::internal
67 
68  } // end of namespace mln::canvas::labeling
69 
70  } // end of namespace mln::canvas
71 
72 } // end of namespace mln
73 
74 #endif // ! MLN_CANVAS_LABELING_INTERNAL_FIND_ROOT_FASTEST_HH