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Re: Global variable modification by nameref chain


From: Chet Ramey
Subject: Re: Global variable modification by nameref chain
Date: Wed, 15 Jun 2016 14:58:46 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:45.0) Gecko/20100101 Thunderbird/45.1.1

On 6/14/16 12:16 PM, Dan Douglas wrote:
> On Sun, Jun 12, 2016 at 8:33 PM, Chet Ramey <address@hidden> wrote:
>> 3. Honor the assignment and delete the nameref variable, creating a new
>>    one, like bash-4.3:
>>
>> $ ../bash-4.3-patched/bash ./x1
>> declare -n a="b"
>> declare -n b="a[1]"
>> declare -a a='([1]="foo")'
>> declare -n b="a[1]"
> 
> I kind of like this option because it's consistent with `typeset -n`
> meaning "operate directly on the ref variable", and declare together
> with assignment meaning "redefine the variable" in most cases. I'm not
> so sure a warning is needed since replacing the variable with a new
> definition would be the usual thing to do with any other attributes,
> and the identifier literals used within one scope should be under
> control.

OK, just to play devil's advocate: why discard the existing value, since
any attribute other than nameref would result in it being preserved as
index 0?

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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