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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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Array subclass:#ImmutableArray
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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69
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category:'System-Compiler-Support'
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65
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!
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!ImmutableArray class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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By default, array literals in smalltalk are mutable objects. That
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may lead to some subtle (and hard to find errors), if some method passes
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a literal array constant as argument to someone else, who changes the
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array using at:put: like messages. Since the array object is kept in
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the first methods literals, the array constant has now been changed without
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having the methods sourcecode reflect this. Thus, the method will
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behave differently from what its source may make you think.
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To help finding this kind of 'feature/bug', the compiler can be
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configured to create instances of this ImmutableArray instead of Arrays
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for array literals. Instances of ImmutableArray catch storing accesses and
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enter the debugger. Although useful, this feature is disabled by default
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for compatibility to other smalltalk implementations.
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(Also, if turned on, this makes inspecting array literals entered in
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a workspace somewhat strange: you cannot modify it any longer).
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Turn the ImmutableArray feature on by setting the Parsers class variable
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'ArraysAreImmutable' to true or use the new launchers settings menu.
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"
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140
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!
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version
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^ '$Header: /cvs/stx/stx/libcomp/Attic/ImmArray.st,v 1.11 1995-11-23 02:13:03 cg Exp $'
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! !
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!ImmutableArray methodsFor:'accessing'!
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at: index put: value
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"Trigger an error if an immutable array is stored into.
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The store will be performed (for compatibility reasons) if you continue
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in the debugger."
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self notifyStoreError.
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^ super at: index put: value
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!
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basicAt: index put: value
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"Trigger an error if an immutable array is stored into.
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The store will be performed (for compatibility reasons) if you continue
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in the debugger."
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self notifyStoreError.
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^ super basicAt: index put: value
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! !
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!ImmutableArray methodsFor:'copying'!
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copyEmpty
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"when copying, return a real (mutable) Array"
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^ Array new:self size
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!
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copyEmptyAndGrow:size
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"when copying, return a real (mutable) Array"
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^ Array new:size
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!
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postCopy
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"when copied, make it me a real (mutable) Array"
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self changeClassTo:Array.
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!
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shallowCopy
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"when copying, return a real (mutable) Array"
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|sz|
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sz := self size.
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^ (Array new:sz)
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replaceFrom:1 to:sz with:self startingAt:1
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! !
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!ImmutableArray methodsFor:'error handling'!
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creator
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"find the method that contains me"
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Method allSubInstances do:[:aMethod |
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|lits|
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lits := aMethod literals.
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(lits notNil and:[(lits identityIndexOf:self) ~~ 0]) ifTrue:[
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^ aMethod
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]
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].
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^ nil
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!
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notifyStoreError
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"a store is attempted - for our convenience, find the method that
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contains me, for a nicer error message"
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|creator msg|
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creator := self creator.
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msg := 'store into/change of literal'.
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creator notNil ifTrue:[
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msg := msg , ' (' , creator whoString , ')'
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].
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"
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this error is reported on an attempt to store into a literal
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array. The literal was created in creator.
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If you press continue in the debugger, the store will be performed.
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If you dont want this, press abort and check your code.
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Storing into literals is VERY VERY bad coding style.
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"
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self error:msg
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! !
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140
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!ImmutableArray methodsFor:'private'!
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65
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140
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species
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"Copies should be mutable"
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^Array
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! !
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65
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!ImmutableArray methodsFor:'queries'!
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65
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isLiteral
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"return true, if the receiver can be used as a literal
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(i.e. can be used in constant arrays)"
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65
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"yes, I must be"
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^ true
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! !
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!ImmutableArray methodsFor:'specials'!
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become:anotherObject
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"trigger an error if I should become something else
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(this would be an even more tricky manipulation)"
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self notifyStoreError.
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^ super become:anotherObject
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!
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becomeNil
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"trigger an error if I should become nil
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(this would be an even more tricky manipulation)"
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self notifyStoreError.
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^ super becomeNil
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! !
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