$g{\%h} = 1;

does not actually store the reference to the %h hash in any way, all it does is add an element to the %g hash with 1 as the value and the string representation of the %h hash ("HASH(0x90fcc70)") as the key. If you really want to use this string representation as the key (not a good idea IMO) you'd do

use strict;

my %h = ("foo" => 1,
         "bar" => 2);

my %g = ();
$g{\%h} = \%h;

my @k = keys %g;
my $hashref = $k[0];
my %tmp = %{$g{$hashref}};
print $tmp{"foo"}

[download]

I think you should use something more useful as the hash key, or, if you just want to store hash references in a data structure without meaningful keys, use an array instead:

use strict;

my %h = ("foo" => 1,
         "bar" => 2);

push (my @g,\%h);
my $hashref = $g[0];
print $hashref->{foo};

[download]

Also, consider using more descriptive variable names (unless this is just an example and not your actual code).


All dogma is stupid.

In reply to Re: Dereferencing references by tirwhan
in thread Dereferencing references by delip

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.