Collection squared but what about fractions.

John M McIntosh johnmci at
Tue Jun 5 00:47:01 UTC 2001

>  >>>>> "Andreas" == Andreas Raab <Andreas.Raab at> writes:
>Andreas> John,
>Andreas> How about making a little tweak in Fraction along the lines of:
>Fraction> * aNumber
>Andreas>	self == aNumber ifTrue:[
>Andreas>		"special case for squaring fractions"
>Andreas>		^self squared]
>Andreas>	"...."
>Andreas> This might even help in some other cases (note that the 
>above uses #== to
>Andreas> prevent doing a full comparison in case of a non-fractional 
>Does that actually make sense?  Are all 1/2's identical?  I can see
>using "=", but not "==".
>Just tested:
>(1/2) == (1/2) false
>(1/2) = (1/2)  true
>So, nope, that true branch would most likely never get triggered.

Ah, you need to step back and look at the squared in Collection, that uses
each * each  so each == each. Evaluating (1/2) == (1/2) is false 
because of the way the compiler builds/treats the (1/2). In VisualAge 
it would be true because it's compiler (in 3.x) would treat the two 
constants (1/2) as the same object.

John M. McIntosh <johnmci at> 1-800-477-2659
Corporate Smalltalk Consulting Ltd.

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