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[gitmo/MooseX-StrictConstructor.git] / lib / MooseX / StrictConstructor.pm

package MooseX::StrictConstructor;

use strict;
use warnings;

our $VERSION = '0.06_02';
$VERSION = eval $VERSION;

use Class::MOP ();
use Moose 0.5504 ();
use Moose::Exporter;
use Moose::Util::MetaRole;
use MooseX::StrictConstructor::Role::Object;
use MooseX::StrictConstructor::Role::Meta::Method::Constructor;


Moose::Exporter->setup_import_methods();

sub init_meta
{
    shift;
    my %p = @_;

    Moose->init_meta(%p);

    my $caller = $p{for_class};

    Moose::Util::MetaRole::apply_metaclass_roles
        ( for_class => $caller,
          constructor_class_roles =>
          ['MooseX::StrictConstructor::Role::Meta::Method::Constructor'],
        );

    Moose::Util::MetaRole::apply_base_class_roles
        ( for_class => $caller,
          roles =>
          [ 'MooseX::StrictConstructor::Role::Object' ],
        );

    return $caller->meta();
}

1;

__END__

=pod

=head1 NAME

MooseX::StrictConstructor - Make your object constructors blow up on unknown attributes

=head1 SYNOPSIS

    package My::Class;

    use Moose;
    use MooseX::StrictConstructor;

    has 'size' => ...;

    # then later ...

    # this blows up because color is not a known attribute
    My::Class->new( size => 5, color => 'blue' );

=head1 DESCRIPTION

Simply loading this module makes your constructors "strict". If your
constructor is called with an attribute init argument that your class
does not declare, then it calls "Carp::confess()". This is a great way
to catch small typos.

=head2 Subverting Strictness

You may find yourself wanting to have your constructor accept a
parameter which does not correspond to an attribute.

In that case, you'll probably also be writing a C<BUILD()> or
C<BUILDARGS()> method to deal with that parameter. In a C<BUILDARGS()>
method, you can simply make sure that this parameter is not included
in the hash reference you return. Otherwise, in a C<BUILD()> method,
you can delete it from the hash reference of parameters.

  sub BUILD {
      my $self   = shift;
      my $params = shift;

      if ( delete $params->{do_something} ) {
          ...
      }
  }

=head1 AUTHOR

Dave Rolsky, C<< <autarch@urth.org> >>

=head1 BUGS

Please report any bugs or feature requests to
C<bug-moosex-strictconstructor@rt.cpan.org>, or through the web
interface at L<http://rt.cpan.org>.  I will be notified, and then
you'll automatically be notified of progress on your bug as I make
changes.

=head1 COPYRIGHT & LICENSE

Copyright 2007-2008 Dave Rolsky, All Rights Reserved.

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

=cut