What you want to do is pass the hash reference to your sub, which expects a reference. Try: sub myroutine {
$hash_ref = (shift);
$$hash_ref{foo}='bar';
}
myroutine(\%thishash);
If you wanted to make sure you were getting a hash reference inside your sub, add a line like this: die "Not a HASH reference" unless (ref($hash_ref) eq "HASH");
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