UNIVERSAL::which - tells fully qualified name of the method
$Id: which.pm,v 0.6 2007/05/15 16:01:20 dankogai Exp dankogai $
use UNIVERSAL::which; use Some::Sub::Class; # which inherits lots of modules # .... my $o = Some::Sub::Class->new; # in scalar context my $fqn = $o->which("method"); # in list context my ($pkg, $name) = $o->which("method"); # as function my $fqn = UNIVERSAL::which('Some::Sub::Class', 'method');
UNIVERSAL::which provides only one method, which.
which
As the name suggests, it returns the fully qualified name of a given method. Sometimes you want to know the true origin of a method but inheritance and AUTOLOAD gets in your way. This module does just that.
t/*.t illustrates how UNIVERSAL::which behaves more in details.
Consider the code below;
no warnings 'once'; package Foo; my $code = sub { 1 }; package Bar; *muge = $code;
In this case, you get undef for $fq = Bar>which('muge') while ($pkg, $name) = Bar->which('muge') is ('Foo', '__ANON__').
undef
$fq = Bar>which('muge')
($pkg, $name) = Bar->which('muge')
('Foo', '__ANON__')
That way the code snippet works as expeted.
my $fq = Bar->which('muge'); &$fg if $fg;
if you get 'Bar::__ANON__' instead, perl will croak on you at the 2nd line.
perlobj, UNIVERSAL::canAUTOLOAD
Dan Kogai, <dankogai at dan.co.jp> http://search.cpan.org/~dankogai/
Original idea seeded by: TANIGUCHI http://search.cpan.org/~taniguchi/
B::svref_2object trick by: HIO http://search.cpan.org/~hio/
AUTOLOAD case suggested by: DAIBA http://search.cpan.org/~daiba/
Anon. coderef bug noted by: MIYAZAKI http://search.cpan.org/~miyazaki/
Copyright (C) 2006-2007 by Dan Kogai
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.
To install UNIVERSAL::which, copy and paste the appropriate command in to your terminal.
cpanm
cpanm UNIVERSAL::which
CPAN shell
perl -MCPAN -e shell install UNIVERSAL::which
For more information on module installation, please visit the detailed CPAN module installation guide.