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"
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COPYRIGHT (c) 2008 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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"{ Package: 'stx:libview2' }"
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ValueHolder subclass:#BooleanValueHolder
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support-Models'
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!
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!BooleanValueHolder class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2008 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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a valueHolder holding a boolean.
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Mostly for documentation purposes and the assertion, that only boolean values
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are held. Also provides convenient logical operations.
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[author:]
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Claus Gittinger
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"
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!
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examples
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"
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[exBegin]
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|b nb|
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b := BooleanValueHolder new.
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nb := b not.
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b value:true.
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nb value.
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b value:false.
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nb value.
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[exEnd]
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"
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! !
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!BooleanValueHolder class methodsFor:'instance creation'!
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new
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"return a new BooleanValueHolder holding false as initial value"
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^ self with:false
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! !
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!BooleanValueHolder methodsFor:'accessing'!
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setValue:aBoolean
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self assert:aBoolean isBoolean.
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value := aBoolean.
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! !
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!BooleanValueHolder methodsFor:'logical operations'!
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& anotherBooleanValueHolder
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"return another valueHolder, which returns the logical and of myself and another valueHolder"
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^ BooleanBlockValue
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forLogical:self and:anotherBooleanValueHolder
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"
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|b1 b2 a|
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b1 := BooleanValueHolder new.
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b2 := BooleanValueHolder new.
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a := b1 & b2.
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b1 value:false.
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b2 value:true.
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a value.
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b1 value:true.
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a value.
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"
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!
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not
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"return another valueHolder, which returns the logical not of myself"
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^ BooleanBlockValue forLogicalNot:self.
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"
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|b nb|
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b := BooleanValueHolder new.
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nb := b not.
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b value:true.
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nb value.
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b value:false.
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nb value.
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"
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!
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| anotherBooleanValueHolder
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"return another valueHolder, which returns the logical and of myself and another valueHolder"
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^ BooleanBlockValue
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forLogical:self or:anotherBooleanValueHolder
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"
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|b1 b2 o|
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b1 := BooleanValueHolder new.
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b2 := BooleanValueHolder new.
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o := b1 | b2.
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b1 value:false.
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b2 value:false.
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o value.
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b1 value:true.
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o value.
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"
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! !
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!BooleanValueHolder class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/BooleanValueHolder.st,v 1.2 2008-05-19 16:12:21 cg Exp $'
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! !
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