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/*********************
/** expr_value.h
** This file is part of the CVC4 prototype.
**
** An expression node.
**
** Instances of this class are generally referenced through
** cvc4::Expr rather than by pointer; cvc4::Expr maintains the
** reference count on ExprValue instances and
**
** The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
**/
#ifndef __CVC4_EXPR_VALUE_H
#define __CVC4_EXPR_VALUE_H
#include "expr.h"
namespace CVC4 {
/**
* This is an ExprValue.
*/
class ExprValue {
// this header fits into one 64-bit word
/** The ID */
unsigned d_id : 32;
/** The expression's reference count. @see cvc4::Expr. */
unsigned d_rc : 8;
/** Kind of the expression */
unsigned d_kind : 8;
/** Number of children */
unsigned d_nchildren : 16;
/** Variable number of child nodes */
Expr d_children[0];
public:
/** Hash this expression.
* @return the hash value of this expression. */
unsigned hash() const;
/** Convert to (wrap in) an Expr.
* @return an Expr pointing to this expression. */
operator Expr();
// Iterator support
typedef Expr* iterator;
typedef Expr const* const_iterator;
iterator begin();
iterator end();
iterator rbegin();
iterator rend();
const_iterator begin() const;
const_iterator end() const;
const_iterator rbegin() const;
const_iterator rend() const;
};
} /* CVC4 namespace */
#endif /* __CVC4_EXPR_VALUE_H */
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