Re^3: 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.

Comment on Re^3: isa() on any scalar

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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.	[reply] [d/l] [select]

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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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