source: NonGTP/Boost/boost/graph/tree_traits.hpp @ 857

Revision 857, 1.3 KB checked in by igarcia, 19 years ago (diff)
Line 
1//  (C) Copyright Jeremy Siek 1999.
2// Distributed under the Boost Software License, Version 1.0. (See
3// accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5
6#ifndef BOOST_TREE_STRUCTURE_HPP
7#define BOOST_TREE_STRUCTURE_HPP
8
9namespace boost {
10
11  template <class T>
12  struct tree_traits {
13    typedef typename T::node_descriptor node_descriptor;   
14    typedef typename T::children_iterator children_iterator;   
15  };
16
17
18  template <class Tree, class TreeVisitor>
19  void traverse_tree(typename tree_traits<Tree>::node_descriptor v,
20                     Tree& t, TreeVisitor visitor)
21  {
22    visitor.preorder(v, t);
23    typename tree_traits<Tree>::children_iterator i, end;
24    tie(i, end) = children(v, t);
25    if (i != end) {
26      traverse_tree(*i++, t, visitor);
27      visitor.inorder(v, t);
28      while (i != end)
29        traverse_tree(*i++, t, visitor);
30    } else
31      visitor.inorder(v, t);
32    visitor.postorder(v, t);
33  }
34
35  struct null_tree_visitor {
36    template <typename Node, typename Tree> void preorder(Node, Tree&) { }
37    template <typename Node, typename Tree> void inorder(Node, Tree&) { }
38    template <typename Node, typename Tree> void postorder(Node, Tree&) { }
39  };
40
41} /* namespace boost */
42
43#endif /* BOOST_TREE_STRUCTURE_HPP */
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