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a7ffc9baae
undefined object. git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/steptalk/trunk@31913 72102866-910b-0410-8b05-ffd578937521
114 lines
2.4 KiB
Objective-C
114 lines
2.4 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 library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#import "STUndefinedObject.h"
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#import "STExterns.h"
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#import "STObjCRuntime.h"
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#import <Foundation/NSString.h>
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#import <Foundation/NSInvocation.h>
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#import <Foundation/NSMethodSignature.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 = STConstructMethodSignatureForSelector(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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/* Nevertheless, it must clear the invocation's result, which may contain
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random contents under GNUstep. That could lead to a crash if the
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expected result is an object. */
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NSMethodSignature *signature = [anInvocation methodSignature];
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NSUInteger n = [signature methodReturnLength];
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if (n > 0)
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{
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char buffer[n];
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memset(buffer, '\0', n);
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[anInvocation setReturnValue: buffer];
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}
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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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