apply default values when applying role to object

diff --git a/lib/Moo/Role.pm b/lib/Moo/Role.pm
index 0f93a78..764ffb2 100644 (file)
--- a/lib/Moo/Role.pm
+++ b/lib/Moo/Role.pm
@@ -262,6 +262,37 @@ sub create_class_with_roles {
   return $new_name;
 }
 
+sub apply_roles_to_object {
+  my ($me, $object, @roles) = @_;
+  my $new = $me->SUPER::apply_roles_to_object($object, @roles);
+  if ($INC{'Moo.pm'}
+      and my $m = Moo->_accessor_maker_for(ref $new)
+      and my $con_gen = Moo->_constructor_maker_for(ref $new)) {
+    require Sub::Quote;
+
+    my $specs = $con_gen->all_attribute_specs;
+    my %attrs = map { @{$INFO{$_}{attributes}||[]} } @roles;
+
+    my $assign = '';
+    my %captures;
+    foreach my $name ( keys %attrs ) {
+      my $spec = $specs->{$name};
+      if ($m->has_eager_default($name, $spec)) {
+        my ($has, $has_cap)
+          = $m->generate_simple_has('$_[0]', $name, $spec);
+        my ($code, $pop_cap)
+          = $m->generate_use_default('$_[0]', $name, $spec, $has);
+
+        $assign .= $code;
+        @captures{keys %$has_cap, keys %$pop_cap}
+          = (values %$has_cap, values %$pop_cap);
+      }
+    }
+    Sub::Quote::quote_sub($assign, \%captures)->($new);
+  }
+  return $new;
+}
+
 sub _composable_package_for {
   my ($self, $role) = @_;
   my $composed_name = 'Role::Tiny::_COMPOSABLE::'.$role;