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Re: [Chicken-users] Protect against mutation
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From: |
Christian Kellermann |
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Subject: |
Re: [Chicken-users] Protect against mutation |
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Date: |
Sat, 27 Dec 2014 15:00:15 +0100 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
* Bahman Movaqar <address@hidden> [141227 13:51]:
> Consider the following snippet:
>
> (use srfi-1)
> (define (mutator lis n) (set! (first lis) n) lis)
> (define ll (list 1 2 3 4))
> (mutator (cdr lis) 100)
> (equal? (second? lis) 100) --> #t
>
> Is there anyway to protect "lis" from mutation? TIA,
No, you would need immutable list objects, which an egg provides
IIRC.
HTH,
Christian
--
May you be peaceful, may you live in safety, may you be free from
suffering, and may you live with ease.