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<DIV>Albert Wagner <<A
href="mailto:alwagner@tcac.net">alwagner@tcac.net</A>> asked:<BR>>
<BR>> >does Smalltalk have any reserved words</DIV>
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<DIV>Michael Vanier <<A
href="mailto:mvanier@cs.caltech.edu">mvanier@cs.caltech.edu</A>>
wrote:</DIV></DIV>
<DIV>> <BR>> self, super, nil, true, and false come to mind. I'm not
sure if they are<BR>> technically reserved. They are called
"pseudovariables" in ST jargon.</DIV>
<DIV>They are write-protected. Also, you cannot define them as temporary</DIV>
<DIV>variables (e.g. | self |). (Squeak tells you that these names are
already defined)</DIV>
<DIV><BR>> "true" and "false" are also pseudovariables, but they are
singleton<BR>> instances of class True and False respectively.
Similarly, nil is the<BR>> singleton instance of class UndefinedObject.
So that just leaves self and<BR>> super ;-)</DIV>
<DIV>There is one additional pseudovariable: thisContext.</DIV>
<DIV>It is hardly ever used for application development, but it</DIV>
<DIV>comes into play when things like exception handling or</DIV>
<DIV>debugging are programmed. This is definitely something</DIV>
<DIV>for our bright stars.</DIV>
<DIV> </DIV>
<DIV>You should also note that there are a few method names that</DIV>
<DIV>are given special treatment. These are</DIV>
<DIV> </DIV>
<DIV> <FONT face=Courier>ifTrue: ifFalse: ifTrue:ifFalse:
ifFalse:ifTrue:<BR> and: or:<BR> whileFalse: whileTrue: whileFalse
whileTrue<BR> to:do: to:by:do:<BR> caseOf:
caseOf:otherwise:<BR> ifNil: ifNotNil: ifNil:ifNotNil:
ifNotNil:ifNil:</FONT></DIV>
<DIV> </DIV>
<DIV>(All these are mentioned in MethodNode class >> initialize)</DIV>
<DIV> </DIV>
<DIV>These messages are usually not sent, but inlined by the compiler. To</DIV>
<DIV>avoid strange errors, you should consider these message names as
reserved.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Greetings, Boris</DIV></BODY></HTML>