Re: Where is the @ISA array?

@__PACKAGE__::ISA means @ISA in the package "__PACKAGE__", not the current package.

use strict;
use warnings;

use base 'CGI';

print "@main::ISA\n";  # CGI

our @ISA;
print "@ISA\n";        # CGI

my @ourISA = do { no strict 'refs'; @{__PACKAGE__ . '::ISA'} };
print "@ourISA\n";     # CGI
[download]

I wouldn't use base. It's even been obsoleted with parent in newer versions of Perl.

Comment on Re: Where is the @ISA array? Select or Download Code

Replies are listed 'Best First'.
Re^2: Where is the @ISA array? by metaperl (Curate) on Jan 21, 2009 at 15:37 UTC
@__PACKAGE__::ISA means @ISA in the package "__PACKAGE__", not the current package. oh, so only with `__PACKAGE__->` do I get the current package placed there?	[reply] [d/l]
Re^3: Where is the @ISA array? by ikegami (Patriarch) on Jan 21, 2009 at 15:53 UTC
No, my post shows it being used elsewhere. And here's another: `$ perl -le'print __PACKAGE__' main` [download] You wouldn't expect `@time::ISA` to mean `@1232553153::ISA`. Same goes for `__PACKAGE__`. It's a built-in function like `time`. `$ perl -le'print CORE::__PACKAGE__' main` [download] Update: I can override it `$ perl -wle'BEGIN { *CORE::GLOBAL::__PACKAGE__ = sub () { "abc" }; } p +rint __PACKAGE__' abc` [download] but I can't call `prototype` on it `$ perl -wle'print prototype "CORE::__PACKAGE__"' Can't find an opnumber for "__PACKAGE__" at -e line 1.` [download] so it's not quite the same as other built-ins. That's probably the only difference.	[reply] [d/l] [select]
Re^2: Where is the @ISA array? by Anonymous Monk on Jan 22, 2009 at 00:01 UTC
Gosh. I didn't know about `parent`. What was wrong with `base`?	[reply] [d/l] [select]
Re^3: Where is the @ISA array? by ikegami (Patriarch) on Jan 22, 2009 at 05:39 UTC
It handles load failures badly.	[reply]
Re^4: Where is the @ISA array? by Anonymous Monk on Jan 22, 2009 at 13:31 UTC
So we should just take your word for that? Can you give an example? I mean ... I have never had problems with this like you describe. Perhaps you are not using it properly?	[reply]
Re^5: Where is the @ISA array? by Corion (Patriarch) on Jan 22, 2009 at 13:40 UTC
Re^6: Where is the @ISA array? by Anonymous Monk on Jan 22, 2009 at 13:48 UTC
Some notes below your chosen depth have not been shown here
Re^5: Where is the @ISA array? by ikegami (Patriarch) on Jan 22, 2009 at 14:02 UTC