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It's one of the reasons I wrote vars::i

by PodMaster (Abbot)
on Dec 18, 2003 at 15:53 UTC ( #315545=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Re: Foo is not a Bar, why?
in thread Foo is not a Bar, why?

It's one of the reasons I wrote vars::i
my $foo = Foo->new; print "foo is".($foo->isa( 'Bar' ) ? '' : ' _not_')." a Bar\n"; package Bar; sub null {} package Foo; use vars::i qw[ @ISA Bar ]; sub new { bless {},shift } __END__ foo is a Bar

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Re: It's one of the reasons I wrote vars::i
by bart (Canon) on Dec 18, 2003 at 22:46 UTC
    That's all good and dandy, but even tough your module looks useful (and generic), I can't say I like the resulting interface — i.e. the use statement. I'd rather see something like this:
    use strict; package Foo; use isa qw(Bar); sub new { bless {},shift }

    The module can actually quite short:

    # file package isa; sub import { my $pkg = shift; my $caller = caller; no strict 'vars'; push @{"$caller\::ISA"}, @_; } 42;
    Et voilà:
    foo is a Bar

    Of course, with base doing the same and more, I don't know if there's much need for this here module.

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