[sf-perl] exporting tags

[Michael Friedman]

 From the Exporter perldoc (under "Specialized Import Lists"):

   If you just want to import extra names in addition
   to the default set you will still need to include
   :DEFAULT explicitly.

I can't tell you why, but that seems to be the way it's supposed to  
work.

-- Mike

On Aug 6, 2007, at 12:26 PM, David Alban wrote:

> Greeings,
>
> I have:
>   package My::Module;
>
>   ...
>
>   BEGIN {
>      ...
>      @EXPORT = qw(
>               &sub_1
>               &sub_2
>               &sub_3
>             );
>
>      @EXPORT_OK = qw(
>                       $scalar_1
>                       $scalar_2
>                     );
>
>      %EXPORT_TAGS = ( foo => [ qw( $scalar_1 $scalar_2 ) ] );
>
>   }
>
> When the module is used as:
>
>   use My::Module qw( :foo );
>
> I see the scalars, but not the exported subroutines.  I can do:
>
>   use My::Module qw( :DEFAULT :foo );
>
> which works, but what I'd really like is to be able to do:
>
>   use My::Module qw( :foo );
>
> and get the subs in @EXPORT along with the subs in the :foo tag.
>
> I think I'm missing something.  Is this impossible?
>
> If I just did 'use My::Module;' I'd get everything in @EXPORT.  Why  
> does
> that stop if I supply a tag.
>
> What I'm trying to do is define a set of Readonly.pm constants in the
> module and let the user decide whether to import them so they don't  
> have
> to use the package prefix, or not to import them and have to use the
> package prefix.  (Which is why I don't want to export them by  
> default.)
>
> Thanks.
> David
> -- 
> Live in a world of your own, but always welcome visitors.
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Michael Friedman                     HighWire Press
Phone: 650-725-1974                  Stanford University
FAX:   270-721-8034                  <friedman at highwire.stanford.edu>
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