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/********************* */
/*! \file arith_static_learner.h
** \verbatim
** Original author: taking
** Major contributors: none
** 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 "cvc4_private.h"
#ifndef __CVC4__THEORY__ARITH__ARITH_STATIC_LEARNER_H
#define __CVC4__THEORY__ARITH__ARITH_STATIC_LEARNER_H
#include "util/stats.h"
#include "theory/arith/arith_utilities.h"
#include <set>
#include <list>
namespace CVC4 {
namespace theory {
namespace arith {
class ArithStaticLearner {
private:
typedef __gnu_cxx::hash_set<TNode, TNodeHashFunction> TNodeSet;
/* Maps a variable, x, to the set of defTrue nodes of the form
* (=> _ (= x c))
* where c is a constant.
*/
typedef __gnu_cxx::hash_map<Node, std::set<Node>, NodeHashFunction> VarToNodeSetMap;
VarToNodeSetMap d_miplibTrick;
std::list<TNode> d_miplibTrickKeys;
/**
* Map from a node to it's minimum and maximum.
*/
typedef __gnu_cxx::hash_map<Node, DeltaRational, NodeHashFunction> NodeToMinMaxMap;
NodeToMinMaxMap d_minMap;
NodeToMinMaxMap d_maxMap;
public:
ArithStaticLearner();
void staticLearning(TNode n, NodeBuilder<>& learned);
void addBound(TNode n);
void clear();
private:
void process(TNode n, NodeBuilder<>& learned, const TNodeSet& defTrue);
void postProcess(NodeBuilder<>& learned);
void iteMinMax(TNode n, NodeBuilder<>& learned);
void iteConstant(TNode n, NodeBuilder<>& learned);
void miplibTrick(TNode var, std::set<Rational>& values, NodeBuilder<>& learned);
/** These fields are designed to be accessable to ArithStaticLearner methods. */
class Statistics {
public:
IntStat d_iteMinMaxApplications;
IntStat d_iteConstantApplications;
IntStat d_miplibtrickApplications;
AverageStat d_avgNumMiplibtrickValues;
Statistics();
~Statistics();
};
Statistics d_statistics;
};/* class ArithStaticLearner */
}/* CVC4::theory::arith namespace */
}/* CVC4::theory namespace */
}/* CVC4 namespace */
#endif /* __CVC4__THEORY__ARITH__ARITH_STATIC_LEARNER_H */
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