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This may be missing the mark, because I don't understand your goal; but for the way switch_var is supposed to work, inside of that sub you could tie $w. Then setting it elsewhere in the program automatically sets $r. Based on my rememberance of subroutine prototypes, maybe something like:

sub switch_var (\$$\$) { my ($reference, $initial, $binding) = @_; # bind $binding to scalar reference $reference tie $$binding, 'SomeClass', $reference; $$binding = $initial; }
where SomeClass is a simple scalar tied package that implements at least TIE to store $reference and STORE to set @$reference = ($value) x $something.

In reply to Re: Transitive aliases by Anonymous Monk
in thread Transitive aliases by JadeNB

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