in reply to Re^2: Function name in a variable, can't recall the concept (introspection with ->can )
in thread Function name in a variable, can't recall the concept

> No, you shouldn't. can performs a method lookup, not a sub lookup.

->can does a sub lookup if @ISA is empty, and the content of @ISA is introspectable too.

And using a package for a module and a class is a pretty dubious concept.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

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Re^4: Function name in a variable, can't recall the concept (introspection with ->can )
by ikegami (Patriarch) on Apr 16, 2019 at 19:21 UTC

    If I understand correctly, you're saying it's ok to use can if you make sure to check that @ISA is empty first?

    1) You didn't do that, so I guess you're saying your code is wrong too?

    2) You'd need to use an alternative approach when @ISA isn't empty. Why not use that all the time?

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      No I'm saying if one is really worried that the inspected module is a class, one can easily check @ISA.

      Cheers Rolf
      (addicted to the Perl Programming Language :)
      Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

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        What about a base class? Do such classes always have a declared  @ISA that is empty?

        Give a man a fish:  <%-{-{-{-<

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        So it is as I said. You're suggesting that we use 

        my $sub =
   @{ get_array_by_name($pkg, 'ISA') }
      ? get_sub_by_name($pkg, $name)
      : $pkg->can($name);

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        instead of 
        my $sub = get_sub_by_name($pkg, $name);

        [download]

        That's ludicrous.

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