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.
"
COPYRIGHT (c) 2003 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' }"
Number subclass:#MetaNumber
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Magnitude-Numbers'
!
!MetaNumber class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2003 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
"
Common behavior for metaNumbers (INF, NaN).
[author:]
Claus Gittinger
[see also:]
Number Infinity NotANumber
Float ShortFloat Fraction FixedPoint Integer Complex
FloatArray DoubleArray
"
! !
!MetaNumber methodsFor:'coercing & converting'!
asFloat
^ self class
raise:#domainErrorSignal
receiver:self
selector:#asFloat
arguments:#()
errorString:'Cannot represent non-finite as float'.
!
asFraction
^ self class
raise:#domainErrorSignal
receiver:self
selector:#asFraction
arguments:#()
errorString:'Cannot represent non-finite as fraction'.
!
asInteger
^ self class
raise:#domainErrorSignal
receiver:self
selector:#asInteger
arguments:#()
errorString:'Cannot represent non-finite as integer'.
!
asLargeFloat
^ self class
raise:#domainErrorSignal
receiver:self
selector:#asLargeFloat
arguments:#()
errorString:'Cannot represent non-finite as float'.
!
asLongFloat
^ self class
raise:#domainErrorSignal
receiver:self
selector:#asLongFloat
arguments:#()
errorString:'Cannot represent non-finite as float'.
!
asShortFloat
^ self class
raise:#domainErrorSignal
receiver:self
selector:#asShortFloat
arguments:#()
errorString:'Cannot represent non-finite as float'.
!
coerce:aNumber
^ aNumber asMetaNumber
!
generality
"NaN, INF etc. are more general than scalars, but not more general than
vectors (e.g. Points)"
^ 105
! !
!MetaNumber class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/MetaNumber.st,v 1.1 2003/06/21 10:12:21 cg Exp $'
!
version_SVN
^ '$Id: MetaNumber.st 10761 2012-01-19 11:46:00Z vranyj1 $'
! !