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No More Object LISP
- To: email@example.com
- Subject: No More Object LISP
- From: firstname.lastname@example.org (Richard Lynch)
- Date: Thu, 17 Jan 91 14:55:50 CST
>Here is an excerpt from a recent posting of Bill St.Clair's in response
>to following question:
>> Does the system and window interface implementation now use CLOS rather
>> than (or as well as) ObjectLisp?
>>Everything is converted to CLOS. ObjectLisp is no more.
>>Bill St. Clair
>I suppose I'm doomed in this but I want to enter one last plea
>that some conversion functions or some sort of support (perhaps
>on top of clos) be given for object lisp. I have a VERY large
>program built on top of it and I want to be able to use 2.0.
>Do other people feel this need? I assume so since considerable
>interface work has likely been done with object lisp.
> HOW ABOUT THOSE WHO AGREE LETTING APPLE KNOW, perhaps if
>there is sufficient concern it will be seen as a legitimate
> One final comment, the reason I stuck with object lisp instead
>of PCL is that a long while ago when plans to upgrade to CLOS
>were announced it was said that object lisp would likely be
>supported on top of CLOS. The recommendation was that if you needed
>speed in the short term (e.g., me) stick with object lisp rather
>than going immediately to aPCL version of CLOS on top of the then
>current lisp which would be slower. It was pointed out that in
>the long term the cost would be that object lisp would become
>slower than the full implementation of CLOS. I chose the first
>route for speed figuring I could accept the slower running later
>of object lisp because I would presumably have a faster hardware
>platform by then. Now I find I have, so to speak, no software
>leg to stand on.
> BTW, is there a strong reason why such conversion code or
>support cannot be provided, does it turn out to be extremely
>hard to do?
Ditto. I was reassured (maybe 8 months ago?) that there would be
conversion functions, but they would not be "perfect" converters. I HOPE
this hasn't changed (unless they got perfect :-)). It would REALLY be a
pain to start all over again and rewrite by hand the extensive libraries of
code we have developed here at work and I have at home (yes, I purchased a
copy of MACL for myself...actually BEFORE I came to work here).
I suspect it WILL be (was?) fairly difficult to write a conversion
function. Object LISP makes no distinction between classes and instances,
and CLOS is very rigid about that.
"TANSTAAFL" Rich email@example.com