"
COPYRIGHT (c) 1989 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.
"
WriteStream subclass:#ReadWriteStream
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Streams'
!
ReadWriteStream comment:'
COPYRIGHT (c) 1989 by Claus Gittinger
All Rights Reserved
$Header: /cvs/stx/stx/libbasic/ReadWriteStream.st,v 1.7 1994-08-05 00:59:32 claus Exp $
'!
!ReadWriteStream class methodsFor: 'documentation'!
copyright
"
COPYRIGHT (c) 1989 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.
"
!
version
"
$Header: /cvs/stx/stx/libbasic/ReadWriteStream.st,v 1.7 1994-08-05 00:59:32 claus Exp $
"
!
documentation
"
ReadWriteStreams allow both read- and write-access to some collection.
To allow this, they reenable some methods blocked in WriteStream.
(being one of the seldom places, where multiple inheritance could be
of good use in smalltalk).
"
! !
!ReadWriteStream methodsFor: 'access-reading'!
peek
"return the element to be read next without advancing read position.
If there are no more elements, nil is returned."
(position > readLimit) ifTrue:[^ nil].
^ collection at:position
!
next
"return the next element; advance read position.
If there are no more elements, nil is returned."
|element|
(position > readLimit) ifTrue:[^ nil].
element := collection at:position.
position := position + 1.
^ element
! !