Devel::Sub::Which - Name information about sub calls à la "can" in UNIVERSAL and <which(1)>.
{ # inject 'which' into a class: package Foo; use Devel::Sub::Which qw(which); } # or into UNIVERSAL (best avoided except as a temporary measure) use Devel::Sub::Which qw(:universal); # introspect like this: $obj->which("foo"); # returns the name of the sub that # will implement the "foo" method # or like this: Devel::Sub::Which::which( $obj, "foo" ); # which is equivalent to: my $code_ref = $obj->can("foo"); Devel::Sub::Which::which($code_ref);
I don't like the perl debugger. I'd rather print debug statements as I go along, mostly saying "i'm going to do so and so", so I know what to look for when stuff breaks.
I also like to make extensive use of polymorphism. Due to the richness of Perl's OO, we have multiple inheritence, delegations, runtime generated classes, method calls on non predeterminate values, etc, and it often makes sense to do:
my $method = "foo";; debug("i'm going to call $method on $obj. FYI, it's going to be " . $obj->which($method)); $obj->$method()
In order to figure out exactly which definition of $method is going to be invoked. This helps the above debugging style by providing more deterministic reporting.
$method
This method determines which subroutine reference will be executed for METHOD, using UNIVERSAL::can (or any overriding implementation),
You can get this method by importing it as a function into a class, or using the :universal export.
:universal
The first form has the same effect as OBJ->which(METHOD), and the second form just delegates to Sub::Identify
Nothing is exported by default.
This module uses Sub::Exporter, so exports can be renamed, etc.
This causes which to become a method in UNIVERSAL, so that you can call it on any object.
which
You can import this into a class and then use it as a method.
Provided for compatibility. Just use Sub::Identify.
Yitzchak Scott-Thoennes provided the know-how needed to get the name of a sub reference. I've since switched to using Sub::Identify, which abstract those details away.
This module is maintained using Darcs. You can get the latest version from http://nothingmuch.woobling.org/Devel-Sub-Which/, and use darcs send to commit changes.
darcs send
Yuval Kogman <nothingmuch@woobling.org>
Copyright (c) 2004 Yuval Kogman. All rights reserved This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Sub::Identify, DB, perldebug, UNIVERSAL, B
1 POD Error
The following errors were encountered while parsing the POD:
Non-ASCII character seen before =encoding in 'à'. Assuming CP1252
To install Devel::Sub::Which, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Devel::Sub::Which
CPAN shell
perl -MCPAN -e shell install Devel::Sub::Which
For more information on module installation, please visit the detailed CPAN module installation guide.