Hi, may I know how I can pass only specific/part of hash to another sub as reference?

sub main
{
   my (%hash_rec) = ();
   $hash_rec{'id'} = "001";
   &doSub1(\%hash_rec);

   # return result should consist of id=001 and id2=002
   print "back main, id=$hash_rec{'id'}, id2=$hash_rec{'id2'}\n";
}

sub doSub1
{
   my ($hash_ref) = @_;
   print "inside doSub1, id=$$hash_ref{'id'}\n";
   $$hash_ref{'id2'} = "002";
   
   # How do I call doSub2 and pass only specific hash id2 as reference
+?
   &doSub2($hash_ref{'id2'});
}


sub doSub2
{
   my ($id2_ref) = @_;
   print "inside doSub2, id2=$$id2_ref\n";
}

[download]

Inside doSub1, I would like to call another sub &doSub2($hash_ref{'id2'}); by passing only specific hash value $$hash_ref{'id2'} or part of $hash_ref as by reference. Is this possible?

Currently, I can only think of doing like codes below;

Before calling &doSub2, I assign $$hash_ref{'id2'} to another local var. Then pass that var to &doSub2 as reference. After that will replace back to $$hash_ref{'id2'}. I am thinking could there be a better or shortcut way in doing so? 

my $id2_value = $$hash_ref{'id2'};
&doSub2{\$id2_value);
$$hash_ref{'id2'} = $id2_value;

[download]

In reply to Sub hash param by reference by hankcoder

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