In response to belg4mit's advice: Consider a *reference* to a variable,
I recommend references and anonymous subroutines like the updated following:

#!/usr/bin/perl -w

use strict;

## variables
my $magic       = 2;
my $sub         = sub { $_[0] * $_[1] }; # sub ref
my %item;

## subroutine
sub tpl        { $magic * 3 };

## populate our hash
$item{ '1' }   = \$magic;            # ref
$item{ 'dbl' } = sub { $magic * 2 }; # anonymous sub
$item{ 'tpl' } = sub { &tpl() };     # anon sub calls sub
$item{ 'x' }   = sub { $sub->( $magic, $_[0] ) };
                                   # anon sub calls sub ref


## fool with $magic value,
## display results
print "Magic: $magic\t1: ", ${$item{1}},
        "\tdbl: ", &{$item{ 'dbl' }}(),
        "\ttpl: ", $item{ 'tpl' }->(),
        "\tx(4): ", $item{ 'x' }->(4),
        "\n";

$magic += 1;
print "Magic: $magic\t1: ", ${$item{1}},
        "\tdbl: ", $item{ 'dbl' }->(),
        "\ttpl: ", &{$item{ 'tpl' }}(),
        "\tx(4): ", $item{ 'x' }->(4),
        "\n";

$magic -= 1;
print "Magic: $magic\t1: ", ${$item{1}},
        "\tdbl: ", &{$item{ 'dbl' }}(),
        "\ttpl: ", $item{ 'tpl' }->(),
        "\tx(4): ", &{$item{ 'x' }}(4),
        "\n";

$magic *= 5;
print "Magic: $magic\t1: ", ${$item{1}},
        "\tdbl: ", $item{ 'dbl' }->(),
        "\ttpl: ", &{$item{ 'tpl' }}(),
        "\tx(4): ", $item{ 'x' }->(4),
        "\n";

## we're good
print "Done\n\n";
exit(0);

[download]

there is quite a bit in there to play with, but it should show you how to use references and anonymous subroutines. notice the different syntax you can use, &{$item{'x'}}(4) and $item{'x'}->(4). be aware, though, that there is no parameter validation, and the output is sloppy

I'm also VERY new at this, so please be gentle
sub referrences are generally daunting, and not so gentle, for the new. but, once you get over your initial fear, they really aren't too difficult to understand.

for more information, look here for tye's tutorial on reference
here and here for a little info on "closures", which build on subroutine references
and, as mentioned above, perlref

hang in there, and piece through the code and few links i gave you. while they may not answer your question out right, they are a start.

Will perl for money
JJ Knitis
(901) 756-7693
gt8073a@industrialmusic.com

In reply to Re: problem with variables in hash values?? by gt8073a
in thread problem with variables in hash values?? by poohhogan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.