[Vm-dev] Re: [Pharo-project] About ~= and ~~
Mariano Martinez Peck
marianopeck at gmail.com
Wed Oct 12 17:26:27 UTC 2011
On Wed, Oct 12, 2011 at 6:44 PM, Eliot Miranda <eliot.miranda at gmail.com>wrote:
>
>
>
> 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?
>
>
with or without special bytecode associated?
>
>>
>> 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
>
>
>
--
Mariano
http://marianopeck.wordpress.com
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