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/********************* -*- C++ -*- */
/** expr.h
** This file is part of the CVC4 prototype.
**
** Reference-counted encapsulation of a pointer to an expression.
**
** The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
**/
#ifndef __CVC4_EXPR_H
#define __CVC4_EXPR_H
namespace CVC4 {
class ExprValue;
/**
* Encapsulation of an ExprValue pointer. The reference count is
* maintained in the ExprValue.
*/
class 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*);
/** Destructor. Decrements the reference count and, if zero,
* collects the ExprValue. */
~Expr();
public:
/** Access to the encapsulated expression.
* @return the encapsulated expression. */
ExprValue* operator->();
/** Const access to the encapsulated expressoin.
* @return the encapsulated expression [const]. */
const ExprValue* operator->() const;
};/* class Expr */
} /* CVC4 namespace */
#endif /* __CVC4_EXPR_H */
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