home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Workbench Add-On
/
Workbench Add-On - Volume 1.iso
/
Dev
/
SmallTalk
/
False.st
< prev
next >
Wrap
Text File
|
1995-08-25
|
2KB
|
110 lines
"======================================================================
|
| False Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk 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 1, or (at your option) any later version.
|
| GNU Smalltalk 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
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbb 26 Jun 91 Fixed ifFalse: to send value to falseBlock
|
| sbb 16 Mar 91 Class creation now separate statement.
|
| sbb 22 Sep 90 Changed printOn: to reflect changes in String
| printOn:.
|
| sbyrne 25 Apr 89 created.
|
"
Boolean subclass: #False
instanceVariableNames: 'truthValue' " ### What's the real ST-80 name? "
classVariableNames: ''
poolDictionaries: ''
category: nil
!
False comment:
'I always tell lies.
I have a single instance in the system, which represents the value false.' !
!False methodsFor: 'basic'!
ifTrue: trueBlock ifFalse: falseBlock
^falseBlock value
!
ifFalse: falseBlock ifTrue: trueBlock
^falseBlock value
!
ifTrue: trueBlock
^nil
!
ifFalse: falseBlock
^falseBlock value
!
not
^true
!
& aBoolean
^false
!
| aBoolean
^aBoolean
!
eqv: aBoolean
^aBoolean not
!
xor: aBoolean
^aBoolean
!
and: aBlock
^false
!
or: aBlock
^aBlock value
!!
!False methodsFor: 'printing'!
printOn: aStream
aStream nextPutAll: 'false'
!!