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(tye)Re: passing hashes and hash reference

by tye (Sage)
on Apr 20, 2001 at 21:19 UTC ( [id://74238]=note: print w/replies, xml ) Need Help??


in reply to Re: passing hashes and hash reference
in thread passing hashes and hash reference

"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")

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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
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($hash_ref,'HASH')) { # Wow! It's a hash! }
    UNIVERSAL is such a wacky thing. It's exactly the kind of direction that I would expect Parrot to take, but only if somehow Java were involved.
      *isa= \&UNIVERSAL::isa; if( isa($ref,"HASH") ) {

      works for me. (:

              - tye (but my friends call me "Tye")

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