Cherry-picked OrderedCollection.st from 0b286fd51da7: * d4c86d7c0bfc: #TUNING by stefan, Stefan Vogel <sv@exept.de> * 692b6497a669: #DOCUMENTATION by stefan, Stefan Vogel <sv@exept.de> * d47bb2912953: #DOCUMENTATION by stefan, Stefan Vogel <sv@exept.de> * abb4316c6bff: #FEATURE by cg, Claus Gittinger <cg@exept.de> * 3a8fce0e8d11: #TUNING by stefan, Stefan Vogel <sv@exept.de> * 03d29bf8c5bb: #REFACTORING by stefan, Stefan Vogel <sv@exept.de> * cccc6c4abcfc: #REFACTORING by stefan, Stefan Vogel <sv@exept.de> * 35d957c7a840: #FEATURE by cg, Claus Gittinger <cg@exept.de> * 6b11890f5f2c: #OTHER by cg, Claus Gittinger <cg@exept.de> * abb6108fb06b: #FEATURE by cg, Claus Gittinger <cg@exept.de> * 2c4768bb2e89: #FEATURE by cg, Claus Gittinger <cg@exept.de> * 4029e964d0f1: #FEATURE by cg, Claus Gittinger <cg@exept.de> * ddcab3a9c2df: #OTHER by cg, Claus Gittinger <cg@exept.de> * 2213eb56e0c7: #REFACTORING by exept, Claus Gittinger <cg@exept.de> * 09ca874a6160: #REFACTORING by exept, Claus Gittinger <cg@exept.de> * 30b332af1f33: #BUGFIX by stefan, Stefan Vogel <sv@exept.de> * 779764ba117b: #REFACTORING by cg, Claus Gittinger <cg@exept.de> * b3d232a613c9: #BUGFIX by stefan, Stefan Vogel <sv@exept.de> * c417f7edaec1: #BUGFIX by stefan, Stefan Vogel <sv@exept.de> * 904b6538f379: #FEATURE by exept, Claus Gittinger <cg@exept.de> * c5887f03e01f: #REFACTORING by stefan, Stefan Vogel <sv@exept.de> * 8912d03aff48: #BUGFIX by exept, Claus Gittinger <cg@exept.de> * de5cd1dab4c3: #DOCUMENTATION by exept, Claus Gittinger <cg@exept.de> * 9bbd26603378: #OTHER by exept, Claus Gittinger <cg@exept.de> * c2c9dc110f42: #FEATURE by stefan, Stefan Vogel <sv@exept.de> * 81d123c6703d: #DOCUMENTATION by stefan, Stefan Vogel <sv@exept.de> * 8aadbb21458a: #BUGFIX by stefan, Stefan Vogel <sv@exept.de> * f210dbb8b2f6: #TUNING by stefan, Stefan Vogel <sv@exept.de> * c2c774fc53c0: #FEATURE by exept, Claus Gittinger <cg@exept.de> * b6f462670875: #DOCUMENTATION by exept, Claus Gittinger <cg@exept.de> * 27ae4021d5d6: #FEATURE by stefan, Stefan Vogel <sv@exept.de> * 10d9e9d85594: #TUNING by exept, Claus Gittinger <cg@exept.de> * 2653d855dcc7: #DOCUMENTATION by exept, Claus Gittinger <cg@exept.de> * 6ea1698a1a34: #FEATURE by stefan, Stefan Vogel <sv@exept.de> * 28762315e664: #OTHER by exept, Claus Gittinger <cg@exept.de> * 7142ea786f3e: #TUNING by stefan, Stefan Vogel <sv@exept.de> * 7875acb42b53: #BUGFIX by stefan, Stefan Vogel <sv@exept.de> * 163a0eebc97e: #BUGFIX by Maren, matilk

     1

"

     2

 COPYRIGHT (c) 2016 by Claus Gittinger

     3

              All Rights Reserved

     4

     5

 This software is furnished under a license and may be used

     6

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

     7

 inclusion of the above copyright notice.   This software may not

     8

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

     9

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

    10

 hereby transferred.

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"

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"{ Package: 'stx:libbasic' }"

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"{ NameSpace: Smalltalk }"

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Object subclass:#VoidObject

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	instanceVariableNames:''

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	classVariableNames:'TheOneAndOnlyVoid'

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	poolDictionaries:''

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	category:'Kernel-Objects'

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!

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!VoidObject class methodsFor:'documentation'!

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copyright

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"

    27

 COPYRIGHT (c) 2016 by Claus Gittinger

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              All Rights Reserved

    29

    30

 This software is furnished under a license and may be used

    31

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

    32

 inclusion of the above copyright notice.   This software may not

    33

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

    34

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

    35

 hereby transferred.

    36

"

    37

!

    38

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documentation

    40

"

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    there is only one instance of this class: Void,

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    representing a void value.

    43

    44

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

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

    46

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

    48

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

    49

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    Smalltalk code does not normally use it.

    51

    52

    [author:]

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        Claus Gittinger

    54

"

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! !

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!VoidObject class methodsFor:'instance creation'!

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basicNew

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    TheOneAndOnlyVoid isNil ifTrue:[

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        TheOneAndOnlyVoid := super basicNew.

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    ].

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    ^ TheOneAndOnlyVoid

    64

    65

    "

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     VoidObject basicNew

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     VoidObject new

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    "

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! !

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!VoidObject class methodsFor:'class initialization'!

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    73

initialize

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    Smalltalk at:#Void put:(self basicNew).

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    Smalltalk at:#void put:(self basicNew). "/ for JavaScript code

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! !

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!VoidObject methodsFor:'printing & storing'!

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printOn:aStream

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    aStream nextPutAll:'Void'.

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! !

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!VoidObject methodsFor:'queries'!

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isVoid

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    ^ true

    88

    89

    "

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     Void isVoid

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    "

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! !

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!VoidObject class methodsFor:'documentation'!

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version

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    ^ '$Header$'

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!

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version_CVS

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    ^ '$Header$'

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! !

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VoidObject initialize!