Re: declare -n next=arr[++elem] == nowork ? [[ -v

[Chet Ramey]

On 3/8/21 11:19 AM, Alex fxmbsw7 Ratchev wrote:
> thank you for your answer
> i have a question about [[ -v $next ]] i havent tried but you say it works 
> it would ? expand $next but wont it then check '[[ -v <content_of_next> ]]' 
> and fail ?

Try it. -v will evaluate an array reference with a subscript to see if that
particular element exists, but the general nameref resolution code does not
(and should not) re-evaluate an array expansion.

> ill benchmark the usage of : $next ; before [[ -v now, if its minimal its 
> all fine i can use
> i just remember it used to work

I doubt it, but it doesn't matter now.

> for the [[ -v arr[++elem] ]] style i do cause i can add in the loop to the 
> array and it continues over the new elements, till no more

Come on, so does iterating from 0 to ${#arr[@]}.

> i also have another this-same-declare issue with a more complex data structure

I think help-bash would be a good place for that discussion.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/