Re: [ID 20010731.072] map vs array of hashes with holes

At 2001-07-31 13:09:49, ric@sylvester.Telcom.Arizona.EDU wrote:
> 
> map {if ($_->{port_mac} eq $mac) {$port = ($_->{port})}} @port; [...]
>
>   Modification of a read-only value attempted at poo.tc line 11.

Offhand, I'd say the readonly value is PL_sv_undef, and the attempted
modification is the vivification of $_->{port_mac}.

> I'm not sure if this a bug, or a restriction that isn't apparent to me
> from the documentation.

It isn't a bug, although the error message is certainly misleading. If
you know that your array will have holes in it, check if $_ is defined
before trying to dereference it.

- ams

• [ID 20010731.072] map vs array of hashes with holes by Ric Anderson
• Re: [ID 20010731.072] map vs array of hashes with holes by Abhijit Menon-Sen