[LON-CAPA-dev] A lesson in globals

[Guy Albertelli II]

Hi Gerd,

> That's all true, but what if you want the following:
> 
> * variable (like a tied hash) should NOT be available from outside the
> package
> * inside the package, you want to refer to it just by its name
> 
> Looks like "my $silly" as a package global works great for that.

No it doesn't.

> > ----- start test.pl -----
> > package globaltest;
> > use strict;
> > my $silly='a';
> > print '1'.$silly."\n";
> > print '2'.$globaltest::silly."\n";
> >
> > package notglobaltest;
> > print '3'.$silly."\n";
> > print '4'.$globaltest::silly."\n";
> > ----- end test.pl -----

$silly is available in both pacakages.

But it's scope is limited to this file.

-- 
guy@albertelli.com  LON-CAPA Developer  0-7-7-1-