NAME

Sub::Attribute - Reliable subroutine attribute handlers

VERSION

This document describes Sub::Attribute version 0.05.

SYNOPSIS

            

              
              
package Attribute::Foo;
use Sub::Attribute;
sub Foo :ATTR_SUB{
        my($class, $sym_ref, $code_ref, $attr_name, $attr_data) = @_;
        # ...
}
# and later
package main;
use parent qw(Attribute::Foo);
sub something :Foo(xyzzy){
        # ...
}
# apply: __PACKAGE__->Foo(\*something, \&something, 'Foo', 'xyzzy')
            
          

DESCRIPTION

Sub::Attribute is a role to define attribute handlers for specific subroutine attributes.

The feature of this module is similar to that of Attribute::Handlers, but has less functionality and more reliability. That is, while Attribute::Handlers provides many options for ATTR(CODE), Sub::Attribute provides no options for ATTR_SUB. However, the attribute handlers defined by Sub::Attribute are always called with informative arguments. Attribute::Handlers's ATTR(CODE) is not called in run-time eval(), so ATTR(CODE) is not reliable.

INTERFACE

The ATTR_SUB meta attribute

Defines a method as an subroutine attribute handler.

CONFIGURATION AND ENVIRONMENT

$ENV{SUB_ATTRIBUTE_DEBUG}

If true, reports how attributes are applied, using warn() function.

DEPENDENCIES

Perl 5.8.1 or later, and a C compiler.

BUGS

No bugs have been reported.

Please report any bugs or feature requests to the author.

SEE ALSO

attributes.

"Subroutine Attributes" in perlsub.

Attribute::Handlers.

AUTHOR

Goro Fuji (gfx) <gfuji(at)cpan.org>.

LICENSE AND COPYRIGHT

Copyright (c) 2009-20010, Goro Fuji (gfx). Some rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.