clone an associative array?

clone an associative array?

[Marc Chantreux]

hello all,

i don't know what i missed in 'parameters expansions' manual but i'm
unable to clone an associative array :

% typeset -A homemade
% homemade=( tm myself c 2005 )
% echo $homemade[tm]
myself

% typeset -A counterfeit
% counterfeit=${homemade}

% echo $counterfeit[c]
m

% counterfeit="${homemade}"
% echo $counterfeit[c]
m

% counterfeit="${(AA)homemade}"
% echo $counterfeit[c]
m

% counterfeit="${(A)homemade}"
% echo $counterfeit[c]
m

# other tries failed too ...

in a future time, i would like to write something as :

func () {
    local who=$1
    shift
    local -A config
    config=$@

    # implementation here ....

}

i'm sure that it is possible, i just want to know how.

regards
mc

Re: clone an associative array?

[Peter Stephenson]

Marc Chantreux wrote:
> hello all,
> 
> i don't know what i missed in 'parameters expansions' manual but i'm
> unable to clone an associative array :
> 
> % typeset -A homemade
> % homemade=( tm myself c 2005 )
> % echo $homemade[tm]
> myself
> 
> % typeset -A counterfeit
> % counterfeit=${homemade}

As it's a sort of array, you need braces.  However, you also need
to copy keys as well as values.  The syntax is:

typeset -A counterfeit
counterfeit=(${(kv)homemade})

Make sure you don't have the option SH_WORD_SPLIT set.  (This is a
classic example of why it's a good idea to get used to doing without it.)

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070




**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.

**********************************************************************

Re: clone an associative array?

[Peter Stephenson]

Peter Stephenson wrote:
> > % typeset -A counterfeit
> > % counterfeit=${homemade}
> 
> As it's a sort of array, you need braces.

I meant parentheses, of course.  You've already got the braces.

> typeset -A counterfeit
> counterfeit=(${(kv)homemade})
> 
> Make sure you don't have the option SH_WORD_SPLIT set.  (This is a
> classic example of why it's a good idea to get used to doing without it.)

This is what Stephane's version works around.

pws


**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.

**********************************************************************

Re: clone an associative array?

[Stephane Chazelas]

On Fri, Aug 19, 2005 at 03:24:52PM +0100, Peter Stephenson wrote:
[...]
> typeset -A counterfeit
> counterfeit=(${(kv)homemade})
> 
> Make sure you don't have the option SH_WORD_SPLIT set.  (This is a
> classic example of why it's a good idea to get used to doing without it.)
[...]

Hmmm,

~$ typeset -A a b
~$ a=(a 1 b '' c 2)
~$ echo "$a[b]"

~$ b=(${(kv)a})
zsh: bad set of key/value pairs for associative array

Hence, the b=("${(@kv)a}") that would also work with
SH_WORD_SPLIT.

-- 
Stephane

Re: clone an associative array?

[Stephane Chazelas]

On Fri, Aug 19, 2005 at 04:13:38PM +0200, Marc Chantreux wrote:
[...]
> % typeset -A counterfeit
> % counterfeit=${homemade}
[...]

counterfeit=("${(@kv)homemade}")

-- 
Stephane