Hi according to the perldocs of Tie::Hash this works 
      sub STORE    {
        warn "Storing data with key $_[1] at $_[0].\n";
        $_[0]{$_[1]} = $_[2]
      }

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and in my tests it does, but I don't really understand why, because $_[0] is supposed to be a reference(!) and is not properly dereferenced here. Looking into the source of Tie::Hash reveals the expected usage. 
package Tie::StdHash;

...

sub TIEHASH  { bless {}, $_[0] }
sub STORE    { $_[0]->{$_[1]} = $_[2] }

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I'm confused, is there any aliasing magic in $_[0] making it act as a non-refrence hash variable?

Cheers Rolf

In reply to Confused about $self in Tie::Hash by LanX

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