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- To: COMMON-LISP@SAIL.STANFORD.EDU
- From: primerd!DOUG@ENX.Prime.PDN
- Date: Mon, 30 Mar 1987 13:35:00 -0000
To: commonlisp (firstname.lastname@example.org)
From: Doug Rand (DOUG@ENX.PRIME.COM) x4182 bldg 10
Date: Mon, 30 Mar 1987 13:26:00 -0000
Subject: Re: MAPing Sequences
>.. an inefficient implementation technique that doesn't support them
> seems like a poor reason to not allow them.
> Kelly Murray
How can one handle circular lists indescriminately in sequence
functions? It seems to me that at minimum the function must record or
mark each cons to avoid a recursive loop. Am I missing an obvious point?
I am curious to know by what technique one can do NTH without scanning the
list (excluding cdr-coded lists)?