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/* Implementation for Objective-C Stack object
Copyright (C) 1993,1994 Free Software Foundation, Inc.
Written by: R. Andrew McCallum <mccallum@gnu.ai.mit.edu>
Date: May 1993
This file is part of the GNU Objective C Class Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <objects/Stack.h>
#include <objects/ArrayPrivate.h>
@implementation Stack
+ initialize
{
if (self == [Stack class])
[self setVersion:0]; /* beta release */
return self;
}
- pushElement: (elt)anElement
{
[self appendElement:anElement];
return self;
}
/* Overriding */
- addElement: (elt)anElement
{
[self pushElement:anElement];
return self;
}
- (elt) popElement
{
return [self removeLastElement];
}
- (elt) topElement
{
return [self lastElement];
}
/* Yipes. What copying semantics do we want here? */
- duplicateTop
{
[self pushElement:[self topElement]];
return self;
}
- exchangeTop
{
if (_count <= 1)
return nil;
[self swapAtIndeces:_count-1 :_count-2];
return self;
}
// OBJECT-COMPATIBLE MESSAGE NAMES;
- pushObject: anObject
{
return [self pushElement:anObject];
}
- popObject
{
return [self popElement].id_u;
}
- topObject
{
return [self topElement].id_u;
}
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.