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/********************* */
/*! \file union_find.cpp
** \verbatim
** Original author: Morgan Deters <mdeters@cs.nyu.edu>
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Path-compressing, backtrackable union-find using an undo
** stack. Refactored from the UF union-find.
**
** Path-compressing, backtrackable union-find using an undo stack
** rather than storing items in a CDMap<>.
**/
#include <iostream>
#include "theory/arrays/union_find.h"
#include "util/cvc4_assert.h"
#include "expr/node.h"
using namespace std;
namespace CVC4 {
namespace theory {
namespace arrays {
template <class NodeType, class NodeHash>
void UnionFind<NodeType, NodeHash>::notify() {
Trace("arraysuf") << "arraysUF cancelling : " << d_offset << " < " << d_trace.size() << " ?" << endl;
while(d_offset < d_trace.size()) {
pair<TNode, TNode> p = d_trace.back();
if(p.second.isNull()) {
d_map.erase(p.first);
Trace("arraysuf") << "arraysUF " << d_trace.size() << " erasing " << p.first << endl;
} else {
d_map[p.first] = p.second;
Trace("arraysuf") << "arraysUF " << d_trace.size() << " replacing " << p << endl;
}
d_trace.pop_back();
}
Trace("arraysuf") << "arraysUF cancelling finished." << endl;
}
// The following declarations allow us to put functions in the .cpp file
// instead of the header, since we know which instantiations are needed.
template void UnionFind<Node, NodeHashFunction>::notify();
template void UnionFind<TNode, TNodeHashFunction>::notify();
}/* CVC4::theory::arrays namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
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