Try it and see.

As written, this won't compile under strict because $self doesn't exist outside of new, so I've removed that. The $self from within new is returned as its output and assigned to $obj, so I think where you wrote $obj->{$self}, you really just meant $obj.

With that minor adjustment and adding a call to Data::Dumper to show what's in $obj, the code becomes

#!/usr/bin/env perl    

use strict;
use warnings;

use Data::Dumper;

package a;

sub new {
  my $class = shift;
  my $self = {};

  bless $self, $class;
  return $self;
}

package main;

my $obj = a->new;

$obj->{avalue} = 10;

print Dumper($obj);
[download]

and produces the output

$VAR1 = bless( {
                 'avalue' => 10
               }, 'a' );
[download]

Of course, as already mentioned, it would be much better OO practice to create an accessor for avalue instead of working directly with the object's internals, but at least you now know a way to see whether your objects contain the data you expect them to.

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