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ConstNode.h
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1998-11-23
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// $Id: ConstNode.h,v 1.11 1998/11/23 17:43:21 zeller Exp $
// Constants
// Copyright (C) 1995 Technische Universitaet Braunschweig, Germany.
// Written by Andreas Zeller <zeller@ips.cs.tu-bs.de>.
//
// This file is part of DDD.
//
// DDD is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// DDD is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with DDD -- see the file COPYING.
// If not, write to the Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// DDD is the data display debugger.
// For details, see the DDD World-Wide-Web page,
// `http://www.cs.tu-bs.de/softech/ddd/',
// or send a mail to the DDD developers <ddd@ips.cs.tu-bs.de>.
#ifndef _DDD_ConstNode_h
#define _DDD_ConstNode_h
#ifdef __GNUG__
#pragma interface
#endif
// A ConstNode returns a constant box upon run-time
#include "assert.h"
#include <iostream.h>
#include "VSLNode.h"
#include "Box.h"
// ConstNode
class ConstNode: public VSLNode {
public:
DECLARE_TYPE_INFO
private:
Box *_box;
protected:
ConstNode(const ConstNode& node):
VSLNode(node), _box(node._box->link())
{}
void dump(ostream& s) const;
void _dumpTree(ostream& s) const;
bool matches(const VSLNode& node) const
{
return VSLNode::matches(node) &&
*_box == *(((ConstNode *)&node)->_box); // dirty trick
}
private:
ConstNode& operator = (const ConstNode&)
{
assert(0); return *this;
}
public:
// Constructor
ConstNode(Box *box, char *type = "ConstNode"):
VSLNode(type), _box(box)
{}
// Destructor
~ConstNode()
{
_box->unlink();
}
// Copy
VSLNode *dup() const
{
return new ConstNode(*this);
}
const Box *_eval(ListBox *arglist) const;
bool isConst() const { return true; }
bool isConstNode() const { return true; }
bool isStraight() const;
// Representation invariant
bool OK() const;
};
#endif