FFI: Make FFI call return nil when C function returns NULL
Before when a C function returned NULL pointer, an ExternalAddress with
address 0 wes returned which required an extra check in a caller to
convert it to nil, which would be the customary. This commit automatically
converts NULL pointers to Smalltalk `nil` as a courtesy to a Smalltalker.
"{ Encoding: utf8 }"
"
COPYRIGHT (c) 2001 by eXept Software AG
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 }"
ProceedableError subclass:#SubclassResponsibilityError
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Kernel-Exceptions-Errors'
!
!SubclassResponsibilityError class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2001 by eXept Software AG
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
"
Raised when a method which should have been reimplemented by a
concrete subclass was not, and the method of the abstract class was
invoked instead.
"
! !
!SubclassResponsibilityError class methodsFor:'initialization'!
initialize
NotifierString := 'method must be reimplemented in subclass'
! !
!SubclassResponsibilityError methodsFor:'queries'!
description
|dscr|
dscr := super description.
parameter isNil ifTrue:[^ dscr].
^ '"',parameter , '" ', dscr
"Modified: / 19-12-2010 / 08:50:13 / cg"
! !
!SubclassResponsibilityError class methodsFor:'documentation'!
version
^ '$Header$'
!
version_CVS
^ '$Header$'
! !
SubclassResponsibilityError initialize!