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Postings from December 2002
----- Original Message -----
From: "Paul Kraus" <pkraus@pelsupply.com>
To: "Perl" <beginners@perl.org>
Sent: Wednesday, December 11, 2002 2:16 PM
Subject: Constants and Hash Question
> I am declaring my constants like this.
> use constant SOURCE => "/path/folder/"
> Now how would I use this constant is a print statement or any statement
> for that matter.
> print "$SOURCE" does not work and of course print "source" will not
> work.
>
print SOURCE;
>
> I understand that this works but I do not understand what its doing and
> the need for the parenthesis.
> Could someone explain this statement for me. I have put <> around the
> part I don't understand.
>
> this is part of a tied hash for Config::IniFiles.
> --=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> while (($k,$v) = each <%{$ini{$section}}>)
>
%ini is a hash being referenced by scalar $section. The hash values are
references to other hashes, so $ini{$section} is a hash reference. This must
be enclosed in a block before it is dereferenced to a hash, as
%$ini{$section} would try to dereference scalar $ini (which doesn't exist)
as a hash. So we have %{ $ini{$section} }.
HTH,
Rob
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