As I continue my journey thru gnat's stages of a Perl programmer, I reach Slide 32 and have a few questions.

The first thing I think I know. Typeglobs are containers holding references to each of the 7 perl types for a particular variable name. They only exist for package variables. Typeglobs do not exist for lexical variables. Since the only two types of variables in Perl are lexical and package, one can say that 1 of the 2 has typeglobs as its storage support.

Now for some questions. In this slide gnat says: 

# Perl lets you use a glob wherever you would use a filehandle, so glo
+bs are often used to pass filehandles to a subroutine:


  open(HANDLE, $filename) or die;
  mysub(*HANDLE);

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That's all well and good. And I assume mysub looks like this: 

  sub mysub { my $fh = shift; while (<$fh>) { ... } }

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But what happens when you want to pass a format or dirhandle to a subroutine instead of a filehandle.

In reply to typeglob questions by princepawn

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