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nodevisitor.hh
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Guido Tack <tack@gecode.org>
5 *
6 * Copyright:
7 * Guido Tack, 2006
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
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33
34#ifndef GECODE_GIST_NODEVISITOR_HH
35#define GECODE_GIST_NODEVISITOR_HH
36
37namespace Gecode { namespace Gist {
38
40 template<class Cursor>
42 protected:
44 Cursor c;
45 public:
47 NodeVisitor(const Cursor& c0);
49 void setCursor(const Cursor& c0);
51 Cursor& getCursor(void);
52 };
53
55 template<class Cursor>
56 class PostorderNodeVisitor : public NodeVisitor<Cursor> {
57 protected:
58 using NodeVisitor<Cursor>::c;
60 void moveToLeaf(void);
61 public:
63 PostorderNodeVisitor(const Cursor& c);
65 bool next(void);
67 void run(void);
68 };
69
71 template<class Cursor>
72 class PreorderNodeVisitor : public NodeVisitor<Cursor> {
73 protected:
74 using NodeVisitor<Cursor>::c;
76 bool backtrack(void);
77 public:
79 PreorderNodeVisitor(const Cursor& c);
81 bool next(void);
83 void run(void);
84 };
85
86}}
87
89
90#endif
91
92// STATISTICS: gist-any
Base class for a visitor that runs a cursor over a tree.
Cursor c
The cursor.
Cursor & getCursor(void)
Return the cursor.
NodeVisitor(const Cursor &c0)
Constructor.
void setCursor(const Cursor &c0)
Reset the cursor object to c0.
Run a cursor over a tree, processing nodes in post-order.
PostorderNodeVisitor(const Cursor &c)
Constructor.
bool next(void)
Move cursor to next node, return true if succeeded.
void run(void)
Execute visitor.
void moveToLeaf(void)
Move the cursor to the left-most leaf.
Run a cursor over a tree, processing nodes in pre-order.
bool next(void)
Move cursor to the next node, return true if succeeded.
PreorderNodeVisitor(const Cursor &c)
Constructor.
bool backtrack(void)
Move cursor to next node from a leaf.
void run(void)
Execute visitor.
Gecode toplevel namespace