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/********************* -*- C++ -*- */
/** cvc4_expr.h
** This file is part of the CVC4 prototype.
** Copyright (c) 2009 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.
**
** Reference-counted encapsulation of a pointer to an expression.
**/
#ifndef __CVC4_EXPR_H
#define __CVC4_EXPR_H
#include <vector>
#include <stdint.h>
#include "cvc4_config.h"
#include "expr/kind.h"
namespace CVC4 {
namespace expr {
class ExprValue;
}/* CVC4::expr namespace */
using CVC4::expr::ExprValue;
/**
* Encapsulation of an ExprValue pointer. The reference count is
* maintained in the ExprValue.
*/
class CVC4_PUBLIC Expr {
/** A convenient null-valued encapsulated pointer */
static Expr s_null;
/** The referenced ExprValue */
ExprValue* d_ev;
/** This constructor is reserved for use by the Expr package; one
* must construct an Expr using one of the build mechanisms of the
* Expr package.
*
* Increments the reference count. */
explicit Expr(ExprValue*);
typedef Expr* iterator;
typedef Expr const* const_iterator;
friend class ExprBuilder;
public:
CVC4_PUBLIC Expr(const Expr&);
/** Destructor. Decrements the reference count and, if zero,
* collects the ExprValue. */
CVC4_PUBLIC ~Expr();
Expr& operator=(const Expr&) CVC4_PUBLIC;
/** Access to the encapsulated expression.
* @return the encapsulated expression. */
ExprValue* operator->() const CVC4_PUBLIC;
uint64_t hash() const;
Expr eqExpr(const Expr& right) const;
Expr notExpr() const;
Expr negate() const; // avoid double-negatives
Expr andExpr(const Expr& right) const;
Expr orExpr(const Expr& right) const;
Expr iteExpr(const Expr& thenpart, const Expr& elsepart) const;
Expr iffExpr(const Expr& right) const;
Expr impExpr(const Expr& right) const;
Expr xorExpr(const Expr& right) const;
Expr skolemExpr(int i) const;
Expr substExpr(const std::vector<Expr>& oldTerms,
const std::vector<Expr>& newTerms) const;
Expr plusExpr(const Expr& right) const;
Expr uMinusExpr() const;
Expr multExpr(const Expr& right) const;
inline Kind getKind() const;
static Expr null() { return s_null; }
};/* class Expr */
}/* CVC4 namespace */
#include "expr/expr_value.h"
namespace CVC4 {
inline Kind Expr::getKind() const {
return Kind(d_ev->d_kind);
}
}/* CVC4 namespace */
#endif /* __CVC4_EXPR_H */
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