NAME
MooseX::MarkAsMethods - Mark overload code symbols as methods
VERSION
This document describes version 0.15 of MooseX::MarkAsMethods - released
May 30, 2012 as part of MooseX-MarkAsMethods.
SYNOPSIS
package Foo;
use Moose;
# mark overloads as methods and wipe other non-methods
use MooseX::MarkAsMethods autoclean => 1;
# define overloads, etc as normal
use overload '""' => sub { shift->stringify };
package Baz;
use Moose::Role;
use MooseX::MarkAsMethods autoclean => 1;
# overloads defined in a role will "just work" when the role is
# composed into a class; they MUST use the anon-sub style invocation
use overload '""' => sub { shift->stringify };
# additional methods generated outside Class::MOP/Moose can be marked, too
use constant foo => 'bar';
__PACKAGE__->meta->mark_as_method('foo');
package Bar;
use Moose;
# order is important!
use namespace::autoclean;
use MooseX::MarkAsMethods;
# ...
DESCRIPTION
MooseX::MarkAsMethods allows one to easily mark certain functions as
Moose methods. This will allow other packages such as
namespace::autoclean to operate without blowing away your overloads.
After using MooseX::MarkAsMethods your overloads will be recognized by
Class::MOP as being methods, and class extension as well as composition
from roles with overloads will "just work".
By default we check for overloads, and mark those functions as methods.
If "autoclean => 1" is passed to import on using this module, we will
invoke namespace::autoclean to clear out non-methods.
TRAITS APPLIED
Using this package causes a trait to be applied to your metaclass (for
both roles and classes), that provides a mark_as_method() method. You
can use this to mark newly generated methods at runtime (e.g. during
class composition) that some other package has created for you.
mark_as_method() is invoked with one or more names to mark as a method.
We die on any error (e.g. name not in symbol table, already a method,
etc). e.g.
__PACKAGE__->meta->mark_as_method('newly_generated');
e.g. say you have some sugar from another package that creates accessors
of some sort; you could mark them as methods via a method modifier:
# called as __PACKAGE__->foo_generator('name', ...)
after 'foo_generator' => sub {
shift->meta->mark_as_method(shift);
};
IMPLICATIONS FOR ROLES
Using MooseX::MarkAsMethods in a role will cause Moose to track and
treat your overloads like any other method defined in the role, and
things will "just work". That's it.
Except... note that due to the way overloads, roles, and Moose work,
you'll need to use the coderef or anonymous subroutine approach to
overload declaration, or things will not work as you expect. Remember,
we're talking about _methods_ here, so we need to make it easy for
overload to find the right method. The easiest (and supported) way to do
this is to create an anonymous sub to wrap the overload method.
That is, this will work:
# note method resolution, things will "just work"
use overload '""' => sub { shift->stringify };
...and this will not:
use overload '""' => 'stringify';
...and will result in an error message like:
# wah-wah
Can't resolve method "???" overloading """" in package "overload"
CAVEATS
Roles
See the "IMPLICATIONS FOR ROLES" section, above.
meta->mark_as_method()
You almost certainly don't need or want to do this. CMOP/Moose are
fairly good about determining what is and what isn't a method, but not
perfect. Before using this method, you should pause and think about why
you need to.
namespace::autoclean
As currently implemented, we run our "method maker" at the end of the
calling package's compile scope (B::Hooks::EndOfScope). As
namespace::autoclean does the same thing, it's important that if
namespace::autoclean is used that it be used BEFORE
MooseX::MarkAsMethods, so that its end_of_scope block is run after ours.
e.g.
# yes!
use namespace::autoclean;
use MooseX::MarkAsMethods;
# no -- overloads will be removed
use MooseX::MarkAsMethods;
use namespace::autoclean;
The easiest way to invoke this module and clean out non-methods without
having to worry about ordering is:
use MooseX::MarkAsMethods autoclean => 1;
SEE ALSO
Please see those modules/websites for more information related to this
module.
* overload, B::Hooks::EndOfScope, namespace::autoclean, Class::MOP,
* Moose.
* MooseX::Role::WithOverloading does allow for overload application
from
* roles, but it does this by copying the overload symbols from the
(not
* namespace::autoclean'ed role) the symbols handing overloads during
class
* composition; we work by marking the overloads as methods and letting
* CMOP/Moose handle them.
SOURCE
The development version is on github at
<http://github.com/RsrchBoy/moosex-markasmethods> and may be cloned from
<git://github.com/RsrchBoy/moosex-markasmethods.git>
BUGS
Please report any bugs or feature requests on the bugtracker website
https://github.com/RsrchBoy/moosex-markasmethods/issues
When submitting a bug or request, please include a test-file or a patch
to an existing test-file that illustrates the bug or desired feature.
AUTHOR
Chris Weyl <cweyl@alumni.drew.edu>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2011 by Chris Weyl.
This is free software, licensed under:
The GNU Lesser General Public License, Version 2.1, February 1999