cc: [email protected] [EMAIL PROTECTED]
Subject: Re: Re: [ast-developers] Two array assignment problems
--------
> >
> >> 1. The assignment
> >>
> >> typeset -a x=(a b c)
> >>
> >> makes an indexed array x, but a subsequent
> >>
> >> x=([0]=a [2]=b [5]=c)
> >>
> >> turnes x into an associative array - against my declared will, and for no
> >> obvious reason. On the other hand, the statement
> >>
> >> typeset -a x=([0]=a [2]=b [5]=c)
> >>
> >> creates an indexed array, though the right side has exactly the same form
> >> as above. This looks inconsistent to me, and also causes problems when
> >> assigning values to elements of a global array in a function. Example:
> > Actually, the array assignment should unset the variable before
> > the assignment so that x should be an associative array and have only
> > three elements.
> > x+=([0]=a [2]=b [5]=c)
> > should modify/add elements to the indexed array. However, there is
> > a bug here and the array is being converted to an associative array.
> > I will fix this and in the case you describe, I will first unset the
> > variable x before the assignment.
>
> Hm, just to make things clear: I'm writing a 'function vared' which allows
> editing of variables of any kind. It uses an editor and a temporary file,
> which is sourced after editing. So
>
> typeset -a x=([1]=a [3]=b)
> vared a
>
> generates a line like
>
> x=([1]=a [3]=b)
>
> in the file, which the user may change at his will, e.g.
>
> x=([1]=a [5]=c)
>
> Do I understand you right that this would make x associative again, but the
> following would work?
>
> x+=([1]=a [5]=c)
No, this won't work. x=() creates an empty compound variable not an
indexed array so that this will be turned into an associative array.
typeset -a x
x+=(([1]=a [5]=c)
Using += will leave the array type alone but will add or replace elements.
If you want to remove all the elements but leave the array type, then you can
do:
for i in "[EMAIL PROTECTED]"
do unset x[$i]}
done
If you do
unset x
then the array type will be lost.
>
> Regards,
> Bernd
>
> --
> Bernd Eggink
> [EMAIL PROTECTED]
> http://sudrala.de
>
David Korn
[EMAIL PROTECTED]
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