Turn composition_class_roles into a plain method.

diff --git a/lib/Moose/Meta/Role.pm b/lib/Moose/Meta/Role.pm
index 9bc4310..e387a05 100644 (file)
--- a/lib/Moose/Meta/Role.pm
+++ b/lib/Moose/Meta/Role.pm
@@ -159,12 +159,6 @@ $META->add_attribute(
     default => 'Moose::Meta::Role::Application::ToInstance',
 );
 
-$META->add_attribute(
-    'composition_class_roles',
-    reader    => 'composition_class_roles',
-    predicate => 'has_composition_class_roles',
-);
-
 ## some things don't always fit, so they go here ...
 
 sub add_attribute {
@@ -395,6 +389,8 @@ sub apply {
     return $application_class->new(@args)->apply($self, $other);
 }
 
+sub composition_class_roles { }
+
 sub combine {
     my ($class, @role_specs) = @_;
 
@@ -697,6 +693,14 @@ and C<-alias> keys to control how methods are composed from the role.
 The return value is a new L<Moose::Meta::Role::Composite> that
 represents the combined roles.
 
+=item B<< $metarole->composition_class_roles >>
+
+When combining multiple roles using C<combine>, this method is used to obtain a
+list of role names to be applied to the L<Moose::Meta::Role::Composite>
+instance returned by C<combine>. The default implementation returns an empty
+list. Extensions that need to hook into role combination may wrap this method
+to return additional role names.
+
 =item B<< Moose::Meta::Role->create($name, %options) >>
 
 This method is identical to the L<Moose::Meta::Class> C<create>

diff --git a/lib/Moose/Meta/Role/Composite.pm b/lib/Moose/Meta/Role/Composite.pm
index ee86b7f..522fc5b 100644 (file)
--- a/lib/Moose/Meta/Role/Composite.pm
+++ b/lib/Moose/Meta/Role/Composite.pm
@@ -48,9 +48,7 @@ sub new {
     }
 
     my @composition_roles = map {
-        $_->has_composition_class_roles
-            ? @{ $_->composition_class_roles }
-            : ()
+        $_->composition_class_roles
     } @{ $params{roles} };
 
     if (@composition_roles) {

diff --git a/t/050_metaclasses/030_metarole_combination.t b/t/050_metaclasses/030_metarole_combination.t
index 2b1e928..c9291bc 100644 (file)
--- a/t/050_metaclasses/030_metarole_combination.t
+++ b/t/050_metaclasses/030_metarole_combination.t
@@ -97,9 +97,10 @@ our @applications;
     package Role::WithCustomApplication;
     use Moose::Role;
 
-    has '+composition_class_roles' => (
-        default => ['Role::Composite'],
-    );
+    around composition_class_roles => sub {
+        my ($orig, $self) = @_;
+        return $self->$orig, 'Role::Composite';
+    };
 }
 
 {
@@ -138,7 +139,7 @@ ok( My::Role::Special->meta->isa('Moose::Meta::Role'),
 );
 ok( My::Role::Special->meta->meta->does_role('Role::WithCustomApplication'),
     "the role's metaobject has custom applications" );
-is_deeply( My::Role::Special->meta->composition_class_roles,
+is_deeply( [My::Role::Special->meta->composition_class_roles],
     ['Role::Composite'],
     "the role knows about the specified composition class" );