Travis Thornhill wrote:
>
> Is there such a thing?
>
> I'm trying to take a HoH and make a reference to a sub-part of the hash.
>
> This doesn't work:
>
> my %sub_hash = $main_hash{'sub_hash'};
>
> I get the following error:
> Reference found where even-sized list expected at ./my_buggy_program line 30.
>
> Any quick tips on how to reference and assign this sub-hash?
There is certainly such a thing as a hash slice, but I think it is probably not
what you want here. A slice will let you extract multiple values from the hash
simultaneously, something like
my @subhashes = @main_hash{'key1', 'key2', 'key3'};
and it doesn't look to me like that's what you're trying to achieve.
If you have a hash of hashes then $main_hash{'sub_hash'} is already a reference,
as the error message has told you, so you should write
my $subhash_ref = $main_hash{'sub_hash'};
after which you can access the subsidiary hash with constructs like
foreach my $key (keys %$subhash_ref) {
printf "%s => %s\n", $key, $subhash_ref->{$key};
}
HTH,
Rob
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