[squeak-dev] Re: [Pharo-project] About ~= and ~~

Eliot Miranda eliot.miranda at gmail.com
Wed Oct 12 16:44:34 UTC 2011


On Wed, Oct 12, 2011 at 8:38 AM, Levente Uzonyi <leves at elte.hu> wrote:

> On Wed, 12 Oct 2011, Clara Allende wrote:
>
>  Hi guys,
>>
>> I'm wondering, why?
>>
>> ProtoObject>> ~~ anObject
>>   "Answer whether the receiver and the argument are not the same object
>>   (do not have the same object pointer)."
>>
>>   self == anObject
>>       ifTrue: [^ false]
>>       ifFalse: [^ true]
>>
>> Instead of:
>> ProtoObject>> ~~ anObject
>>   "Answer whether the receiver and the argument are not the same object
>>   (do not have the same object pointer)."
>>
>>   ^(self == anObject) not
>>
>> And why?
>> Object >> ~= anObject
>>   "Answer whether the receiver and the argument do not represent the
>>   same object."
>>
>>   ^self = anObject == false
>>
>> Instead of
>> Object>> ~= anObject
>>   "Answer whether the receiver and the argument do not represent the
>>   same object."
>>
>>   ^(self = anObject) not.
>>
>> Is there any particular reason for this that I'm missing?
>>
>
> Performance.
>

But better still is to add a ~~ primitive.  I did this for VisualWorks.
 e.g. primitive 150 is free.  why don't we use that for 1.4/4.3?


>
>
> Levente
>
>  Thanks in advance!
>> --
>>
>> "*Most good programmers do programming not because they expect to get paid
>> or get adulation by the public, but because it is fun to program.*"
>>
>> Linus Torvalds
>>
>>
>


-- 
best,
Eliot
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.squeakfoundation.org/pipermail/squeak-dev/attachments/20111012/7854faa7/attachment.htm


More information about the Squeak-dev mailing list