Re: [Scheme-reports] Legacy caar to cddddr

[Ray Dillinger <bear@x>]

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On 10/20/2011 01:18 AM, Alex Shinn wrote:
> On Sun, Oct 16, 2011 at 11:44 PM, Jussi Piitulainen
> <jpiitula@x> wrote:
>>
>> Do all these need to remain in the language? In (scheme base)?
> 
> We should put them somewhere for compatibility, but
> I definitely think everything but the one and two depth
> combinations should be removed from (scheme base).
> Their use is generally a code smell.  People should
> use destructuring, records, or SRFI-1 first..tenth accessors.
> 

The historic use of these entities was as accessors for
structured aggregates implemented with cons cells.  In
a language that directly supports records, they have a
reduced mission.

It was possible to implement a general macro version (that
parsed the token and expanded it as far as necessary) of
the "c(a|d)+r" operators using the old "explode" and "implode"
commands to destructure the symbol itself, but those have
been eliminated since, I think, R4RS. And I don't think it
would work with current macrology anyway.


				Bear

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