Re: Re: has it been blessed?

The second test you pose is probably the more efficient, but you overlook a few candidates:

    my $ref;
    if ($ref = ref($obj) and $ref !~ /^(SCALAR|ARRAY|HASH|GLOB|Regexp)
+$/) {
        $obj->method();
    }
[download]

Technically, the Regexp references are objects, but they are part of the core, and wouldn't represent an application-defined class. Of course, you can drop that from the regex above, if you like.

--rjray

Comment on Re: Re: has it been blessed? Download Code

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Re: Re: Re: has it been blessed? by chipmunk (Parson) on Mar 07, 2002 at 02:10 UTC
Efficiency is nice, but there's something to be said for correctness as well. You've also forgotten REF, CODE, and LVALUE. Comparing the return value from ref to a list of known types is simply the wrong approach. Either you'll forget something, or a new type will be added in a future version and your code will break. Go with the UNIVERSAL::isa() approach. Really.	[reply]
Re: Re: Re: Re: has it been blessed? by rjray (Chaplain) on Mar 07, 2002 at 20:35 UTC
I agree, but to clarify, the best approach would seem to be: `if (ref($obj) and UNIVERSAL::isa($obj, 'UNIVERSAL')) { ... }` [download] Well, "best" in absence of the `blessed` primitive, of course... --rjray	[reply] [d/l]
Re: Re: Re: Re: Re: has it been blessed? by dragonchild (Archbishop) on Mar 07, 2002 at 20:44 UTC
`if (UNIVERSAL::isa($obj, 'UNIVERSAL')) {` is more than enough. If it's not a reference, UNIVERSAL::isa() will return undef. Don't bother doing a check twice. ------ We are the carpenters and bricklayers of the Information Age. Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.	[reply] [d/l]
Re: Re: Re: Re: Re: Re: has it been blessed? by rjray (Chaplain) on Mar 07, 2002 at 21:54 UTC
Re7: has it been blessed? by dragonchild (Archbishop) on Mar 07, 2002 at 22:19 UTC
Re: Re: Re: Re: Re: Re: has it been blessed? by chipmunk (Parson) on Mar 08, 2002 at 05:21 UTC


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