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Re: [Chicken-users] Protect against mutation

From: Bahman Movaqar
Subject: Re: [Chicken-users] Protect against mutation
Date: Sun, 28 Dec 2014 15:30:35 +0330
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0

On 12/27/2014 05:30 PM, Christian Kellermann wrote:
> * 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

Thanks for the hint --I was hoping this to be the default behaviour.
I guess, for me,  setting a personal ban on "set!" is easier than using
a new vocabulary.

Bahman Movaqar - -
PGP Key ID: 0x6AB5BD68 (

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