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Re: Issue: ADJUST-ARRAY-NOT-ADJUSTABLE (version 10)
- To: David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>
- Subject: Re: Issue: ADJUST-ARRAY-NOT-ADJUSTABLE (version 10)
- From: firstname.lastname@example.org (Sandra J Loosemore)
- Date: Sun, 18 Jun 89 14:07:17 MDT
- Cc: email@example.com
- In-reply-to: David A. Moon <Moon@STONY-BROOK.SCRC.Symbolics.COM>, Tue, 13 Jun 89 19:17 EDT
[removed x3j13, added cl-cleanup to distribution]
> If the array returned by ADJUST-ARRAY is not EQ to its
> first argument, the consequences of any reference to the original array
> are undefined.
I'm not sure I understand the motivation for this restriction. I'm
guessing that you want to permit the storage used by the original
array to be re-used. This is OK, however, I think prohibiting
references to the original array is going overboard -- you probably
really want to only restrict references to its contents via AREF.
For example, the rationale section says you should do
(setq x (adjust-array x ...))
Just after ADJUST-ARRAY returns, but before the SETQ happens, X
still contains a reference to the original array, and hence this example
is in error.