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c2c2d22254
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/steptalk/trunk@13642 72102866-910b-0410-8b05-ffd578937521
101 lines
1.9 KiB
Objective-C
101 lines
1.9 KiB
Objective-C
/**
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STUndefinedObject.m
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Wrapper for nil object
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Copyright (c) 2002 Free Software Foundation
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Written by: Stefan Urbanek <urbanek@host.sk>
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Date: 2000
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This file is part of the StepTalk project.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02111, USA.
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*/
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#import <StepTalk/STUndefinedObject.h>
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#import <StepTalk/STExterns.h>
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#import <StepTalk/STObjCRuntime.h>
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#import <Foundation/NSString.h>
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STUndefinedObject *STNil = nil;
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@implementation STUndefinedObject
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+ (id) alloc
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{
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return STNil;
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}
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+ (id) allocWithZone: (NSZone*)z
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{
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return STNil;
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}
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+ (id) autorelease
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{
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return self;
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}
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- (void) dealloc
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{
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NSLog(@"Warning: Trying to dealloc STNil object");
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}
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- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
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{
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NSMethodSignature *signature = nil;
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signature = [super methodSignatureForSelector:sel];
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if(!signature)
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{
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signature = STMethodSignatureForSelector(sel);
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}
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return signature;
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}
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- (void) forwardInvocation: (NSInvocation*)anInvocation
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{
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/* this object is deaf */
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}
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- (BOOL) isEqual: (id)anObject
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{
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return ( (self == anObject) || (anObject == nil) );
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}
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- (void) release
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{
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/* do nothing */
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}
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- (id) retain
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{
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return self;
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}
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- (BOOL)isNil
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{
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return YES;
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}
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- (BOOL)notNil
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{
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return NO;
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}
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@end
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