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ReadWriteStream.st
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1992-02-15
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"======================================================================
|
| ReadWriteStream 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 16 Mar 91 Class creation now separate statement.
|
| sbyrne 20 May 90 Fixed to accomodate changes in WriteStream.
|
| sbyrne 25 Apr 89 created.
|
"
WriteStream subclass: #ReadWriteStream
instanceVariableNames: ''
classVariableNames: ''
poolDictionaries: ''
category: nil
!
ReadWriteStream comment:
'I am the class of streams that may be read and written from simultaneously.
In some sense, I am the best of both ReadStream and WriteStream.' !
!ReadWriteStream class methodsFor: 'instance creation'!
on: aCollection
| stream |
stream _ (super on: aCollection) access: 3.
stream useWholeStream.
^stream
!!
!ReadWriteStream methodsFor: 'private'!
useWholeStream
"Makes sure that the contents message to this object returns the
whole contents, not just that which has been written so far."
endPtr _ collection size
!!