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/********************* */
/*! \file theory_builtin_rewriter.cpp
** \verbatim
** Original author: dejan
** Major contributors: mdeters
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
#include "theory/builtin/theory_builtin_rewriter.h"
using namespace std;
namespace CVC4 {
namespace theory {
namespace builtin {
Node TheoryBuiltinRewriter::blastDistinct(TNode in) {
Assert(in.getKind() == kind::DISTINCT);
if(in.getNumChildren() == 2) {
// if this is the case exactly 1 != pair will be generated so the
// AND is not required
Node eq = NodeManager::currentNM()->mkNode(in[0].getType().isBoolean() ? kind::IFF : kind::EQUAL, in[0], in[1]);
Node neq = NodeManager::currentNM()->mkNode(kind::NOT, eq);
return neq;
}
// assume that in.getNumChildren() > 2 => diseqs.size() > 1
vector<Node> diseqs;
for(TNode::iterator i = in.begin(); i != in.end(); ++i) {
TNode::iterator j = i;
while(++j != in.end()) {
Node eq = NodeManager::currentNM()->mkNode((*i).getType().isBoolean() ? kind::IFF : kind::EQUAL, *i, *j);
Node neq = NodeManager::currentNM()->mkNode(kind::NOT, eq);
diseqs.push_back(neq);
}
}
Node out = NodeManager::currentNM()->mkNode(kind::AND, diseqs);
return out;
}
}/* CVC4::theory::builtin namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
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