You could put the setter and the function in a scope with the hash declared as a lexical. It would be available to them since they are in the closure. Something like this: 
{
   my %value_for;
   sub set_values {
       my ( $key, $value ) = shift;
       $value_for{ $key } = $value;
   }
   sub function {
        # ...
        my $special_value = $value_for{specialness};
        # ...
   }
}

[download]
So value_for is shared by just those two subs.

Phil

In reply to Re: How can I stop relying on a global variable? by philcrow
in thread How can I stop relying on a global variable? by Anonymous Monk

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