Re: passing hashes and hash reference

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);
[download]

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");
[download]

Comment on Re: passing hashes and hash reference Select or Download Code

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(tye)Re: passing hashes and hash reference by tye (Sage) on Apr 20, 2001 at 21:19 UTC
`"HASH" eq ref($ref)` is a fragile test and should be replaced with `UNIVERSAL::isa($ref,"HASH")`. Update: The reason the original test is fragile is that it will make your code refuse to work on a hash if it happens to be blessed. Update2: Changed `"HASH" eq ref` to `"HASH" eq ref($ref)` to avoid confusion. Thanks, BMaximus. - tye (but my friends call me "Tye")	[reply] [d/l] [select]
Re: (tye)Re: passing hashes and hash reference by BMaximus (Chaplain) on Apr 20, 2001 at 21:35 UTC
Shouldn't that be: `ref($hash) eq "HASH"` ? Where $hash is a hashref? How about a bit more on why the `UNIVERSAL::isa()` method is better? I'm curious. BMaximus	[reply] [d/l] [select]
Re^2: passing hashes and hash reference by tadman (Prior) on Apr 20, 2001 at 21:56 UTC
How about: `sub rref { return UNIVERSAL::isa(@_); } if (rref($hash_ref,'HASH')) { # Wow! It's a hash! }` [download] UNIVERSAL is such a wacky thing. It's exactly the kind of direction that I would expect Parrot to take, but only if somehow Java were involved.	[reply] [d/l]
(tye)Re2: passing hashes and hash reference by tye (Sage) on Apr 20, 2001 at 22:00 UTC
`*isa= \&UNIVERSAL::isa; if( isa($ref,"HASH") ) {` [download] works for me. (: - tye (but my friends call me "Tye")	[reply] [d/l]