Cherry-picked `Context`
cherry-picked Context.st from a6b6dda4caff:
* 4aaf30c174e9: #DOCUMENTATION by cg, Claus Gittinger <cg@exept.de>
* c67311afcc6c: #OTHER by cg, Claus Gittinger <cg@exept.de>
* 883f79e7b2a6: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* 716f3fbb09e9: Don't mark contexts with `CATCHMARK`, Jan Vrany <jan.vrany@fit.cvut.cz>
* cff24fa817b0: #REFACTORING by stefan, Stefan Vogel <sv@exept.de>
* 521f0d837330: #UI_ENHANCEMENT by cg, Claus Gittinger <cg@exept.de>
* bf1118f0fcca: #UI_ENHANCEMENT by cg, Claus Gittinger <cg@exept.de>
* e587cdd22868: #BUGFIX by cg, Claus Gittinger <cg@exept.de>
* fe9f9487a3ed: #DOCUMENTATION by cg, Claus Gittinger <cg@exept.de>
* d5b781899274: #BUGFIX by cg, Claus Gittinger <cg@exept.de>
* 8258751a7465: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* 40173e082cbc: Copyright updates, Jan Vrany <jan.vrany@fit.cvut.cz>
* 6db5c28207d5: #UI_ENHANCEMENT by cg, Claus Gittinger <cg@exept.de>
* 871ea64fd5dc: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* 4b544a108e4e: #DOCUMENTATION by cg, Claus Gittinger <cg@exept.de>
* 9a8d8399e566: #FEATURE by cgexept.de, Claus Gittinger <cg@exept.de>
* 170b00be0103: #BUGFIX by stefan, Stefan Vogel <sv@exept.de>
* a6c73965eae8: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* ce2a0e462ff0: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* 46a260a9ca92: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* 46cab49167fb: #UI_ENHANCEMENT by exept, Claus Gittinger <cg@exept.de>
* 7d52dfd3997d: #DOCUMENTATION by exept, Claus Gittinger <cg@exept.de>
* c52eeea62763: Fix `Context >> argAndVarNames` in cases when debug info is not available, Jan Vrany <jan.vrany@labware.com>
* b5d6963fe4a9: Backed out changeset c52eeea62763, Jan Vrany <jan.vrany@labware.com>
* 6fd3896f8703: #FEATURE by exept, Claus Gittinger <cg@exept.de>
* b530ee616256: #REFACTORING by cg, Claus Gittinger <cg@exept.de>
* ef9b481d7498: #FEATURE by cg, Claus Gittinger <cg@exept.de>
* ea663b72bd51: #UI_ENHANCEMENT by cg, Claus Gittinger <cg@exept.de>
* 6179572a733c: #FEATURE by exept, Claus Gittinger <cg@exept.de>
* 84155b1b6622: #DOCUMENTATION by exept, Claus Gittinger <cg@exept.de>
* 37d06602d856: *** empty log message ***, Claus Gittinger <cg@exept.de>
* f927b9022fea: *** empty log message ***, Claus Gittinger <cg@exept.de>
* 427d3be62d97: #UI_ENHANCEMENT by exept, Claus Gittinger <cg@exept.de>
"
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' }"
MetaNumber subclass:#NotANumber
instanceVariableNames:''
classVariableNames:'NaN'
poolDictionaries:''
category:'Magnitude-Numbers'
!
!NotANumber 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
"
Represents the two metaNumbers +INF and -INF for non-float classes.
[author:]
Claus Gittinger
[see also:]
Number Infinity NotANumber
Float ShortFloat Fraction FixedPoint Integer Complex
FloatArray DoubleArray
"
! !
!NotANumber class methodsFor:'instance creation'!
new
^ NaN
! !
!NotANumber class methodsFor:'class initialization'!
initialize
NaN := self basicNew
"
self initialize
"
! !
!NotANumber methodsFor:'arithmetic'!
* aNumber
"Multiply the receiver and the argument and answer with the result."
^ self
!
+ aNumber
"Add the receiver and the argument and answer with the result."
^ self
!
- aNumber
"Subtract the argument from the receiver and answer with the result."
^ self
!
/ aNumber
"Divide the receiver by the argument and answer with the result."
^ self
! !
!NotANumber methodsFor:'comparing'!
= something
"return true, if the argument represents the same numeric value
as the receiver, false otherwise."
something respondsToArithmetic ifTrue:[ ^ something isNaN ].
^ false.
! !
!NotANumber methodsFor:'double dispatching'!
differenceFromSomeNumber:aNumber
"sent from aNumber-self, if aNumber does not know how to handle this"
^ self
!
lessFromSomeNumber:aNumber
"sent from aNumber < self, if aNumber does not know how to handle this"
^ Number
raise: #undefinedResultSignal
receiver: self
selector: #lessFromSomeNumber:
errorString: 'Cannot compare against NaN'
!
productFromSomeNumber:aNumber
"sent from aNumber*self, if aNumber does not know how to handle this"
^ self
!
quotientFromSomeNumber:aNumber
"Return the quotient of the argument, aNumber and the receiver.
Sent when aNumber does not know how to divide by the receiver."
^ self
!
sumFromSomeNumber:aNumber
"sent from aNumber+self, if aNumber does not know how to handle this"
^ self
! !
!NotANumber methodsFor:'printing'!
printOn:aStream
aStream nextPutAll:'NAN'
! !
!NotANumber methodsFor:'testing'!
isFinite
^ false
!
isNaN
^ true
! !
!NotANumber class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/NotANumber.st,v 1.2 2003/07/02 09:52:32 cg Exp $'
! !
NotANumber initialize!