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find_root.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
2 //
3 // This file is part of Olena.
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19 // instantiate templates or use macros or inline functions from this
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25 
26 #ifndef MLN_CANVAS_MORPHO_INTERNAL_FIND_ROOT_HH
27 # define MLN_CANVAS_MORPHO_INTERNAL_FIND_ROOT_HH
28 
34 
35 # include <mln/core/concept/image.hh>
36 
37 namespace mln
38 {
39 
40  namespace canvas
41  {
42 
43  namespace morpho
44  {
45 
46  namespace internal
47  {
48 
49  template <typename I>
50  inline
51  mln_psite(I)
52  find_root(I& parent, const mln_psite(I)& x);
53 
54 
55  template <typename I>
56  inline
57  unsigned
58  find_root_fastest(I& parent, unsigned x);
59 
60 
61 # ifndef MLN_INCLUDE_ONLY
62 
63 
64  template <typename I>
65  inline
66  mln_psite(I)
67  find_root(I& parent, const mln_psite(I)& x)
68  {
69  if (parent(x) == x)
70  return x;
71  else
72  return parent(x) = find_root(parent, parent(x));
73  }
74 
75 
76  template <typename I>
77  inline
78  unsigned
79  find_root_fastest(I& parent, unsigned x)
80  {
81  if (parent.element(x) == 0)
82  return x;
83  else
84  return parent.element(x) = find_root_fastest(parent,
85  parent.element(x));
86  }
87 
88 
89 # endif // ! MLN_INCLUDE_ONLY
90 
91  } // end of namespace mln::canvas::morpho::internal
92 
93  } // end of namespace mln::canvas::morpho
94 
95  } // end of namespace mln::canvas
96 
97 } // end of namespace mln
98 
99 #endif // ! MLN_CANVAS_MORPHO_INTERNAL_FIND_ROOT_HH