"

 COPYRIGHT (c) 2016 by Claus Gittinger

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libbasic' }"

"{ NameSpace: Smalltalk }"

Object subclass:#VoidObject

	instanceVariableNames:''

	classVariableNames:'TheOneAndOnlyVoid'

	poolDictionaries:''

	category:'Kernel-Objects'

!

!VoidObject class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 2016 by Claus Gittinger

              All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    there is only one instance of this class: Void,

    representing a void value.

    This is mainly present for Scheme-like read-eval-print loops,

    in which methods may return void to prevent it from being printed.

    It may also be useful to represent void values as returned from calls

    to external functions (C-void functions) or from remote procedure calls.

    Smalltalk code does not normally use it.

    [author:]

        Claus Gittinger

"

! !

!VoidObject class methodsFor:'instance creation'!

basicNew

    TheOneAndOnlyVoid isNil ifTrue:[

        TheOneAndOnlyVoid := super basicNew.

    ].

    ^ TheOneAndOnlyVoid

    "

     VoidObject basicNew

     VoidObject new

    "

! !

!VoidObject class methodsFor:'class initialization'!

initialize

    |singleton|

    singleton := self basicNew.

    Smalltalk 

        at:#Void put:singleton;

        at:#void put:singleton. "/ for JavaScript code

    "Modified: / 14-03-2018 / 19:32:23 / stefan"

! !

!VoidObject methodsFor:'printing & storing'!

printOn:aStream

    aStream nextPutAll:'Void'.

! !

!VoidObject methodsFor:'queries'!

isVoid

    ^ true

    "

     Void isVoid

    "

! !

!VoidObject class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !

VoidObject initialize!