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Re^3: isa() on any scalar

by gam3 (Curate)
on Jun 11, 2005 at 02:15 UTC ( #465738=note: print w/replies, xml ) Need Help??

in reply to Re^2: isa() on any scalar
in thread isa() on any scalar

No don't do this either. An exception should only be used to catch exceptional events. Since it seems that $value is just as likely not to be a 'Node' as it is to be one you should not use an exception to test it.
-- gam3
A picture is worth a thousand words, but takes 200K.

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Re^4: isa() on any scalar
by chromatic (Archbishop) on Jun 11, 2005 at 08:35 UTC

    As I mentioned, if $value is not a valid invocant, it is an exceptional case.

    I'm not aware of any other idiom that respects potentially-overridden isa() methods and handles potentially invalid invocants in one statement. If you know one, please share.

    Scalar::Util's blessed() is pretty good, but that technique disallows calling isa() as a class method. Sometimes that's good. Sometimes it's not.

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