2 package Moose::Meta::Attribute;
7 use Scalar::Util 'blessed', 'weaken';
11 our $VERSION = '0.57';
12 our $AUTHORITY = 'cpan:STEVAN';
14 use Moose::Meta::Method::Accessor;
16 use Moose::Util::TypeConstraints ();
18 use base 'Class::MOP::Attribute';
20 # options which are not directly used
21 # but we store them for metadata purposes
22 __PACKAGE__->meta->add_attribute('isa' => (reader => '_isa_metadata'));
23 __PACKAGE__->meta->add_attribute('does' => (reader => '_does_metadata'));
24 __PACKAGE__->meta->add_attribute('is' => (reader => '_is_metadata'));
26 # these are actual options for the attrs
27 __PACKAGE__->meta->add_attribute('required' => (reader => 'is_required' ));
28 __PACKAGE__->meta->add_attribute('lazy' => (reader => 'is_lazy' ));
29 __PACKAGE__->meta->add_attribute('lazy_build' => (reader => 'is_lazy_build' ));
30 __PACKAGE__->meta->add_attribute('coerce' => (reader => 'should_coerce' ));
31 __PACKAGE__->meta->add_attribute('weak_ref' => (reader => 'is_weak_ref' ));
32 __PACKAGE__->meta->add_attribute('auto_deref' => (reader => 'should_auto_deref'));
33 __PACKAGE__->meta->add_attribute('type_constraint' => (
34 reader => 'type_constraint',
35 predicate => 'has_type_constraint',
37 __PACKAGE__->meta->add_attribute('trigger' => (
39 predicate => 'has_trigger',
41 __PACKAGE__->meta->add_attribute('handles' => (
43 predicate => 'has_handles',
45 __PACKAGE__->meta->add_attribute('documentation' => (
46 reader => 'documentation',
47 predicate => 'has_documentation',
49 __PACKAGE__->meta->add_attribute('traits' => (
50 reader => 'applied_traits',
51 predicate => 'has_applied_traits',
54 # we need to have a ->does method in here to
55 # more easily support traits, and the introspection
56 # of those traits. We extend the does check to look
57 # for metatrait aliases.
59 my ($self, $role_name) = @_;
61 Moose::Util::resolve_metatrait_alias(Attribute => $role_name)
63 return 0 if !defined($name); # failed to load class
64 return Moose::Object::does($self, $name);
68 my ($class, $name, %options) = @_;
69 $class->_process_options($name, \%options) unless $options{__hack_no_process_options}; # used from clone()... YECHKKK FIXME ICKY YUCK GROSS
70 return $class->SUPER::new($name, %options);
73 sub interpolate_class_and_new {
74 my ($class, $name, @args) = @_;
76 my ( $new_class, @traits ) = $class->interpolate_class(@args);
78 $new_class->new($name, @args, ( scalar(@traits) ? ( traits => \@traits ) : () ) );
81 sub interpolate_class {
82 my ($class, %options) = @_;
84 $class = ref($class) || $class;
86 if ( my $metaclass_name = delete $options{metaclass} ) {
87 my $new_class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name );
89 if ( $class ne $new_class ) {
90 if ( $new_class->can("interpolate_class") ) {
91 return $new_class->interpolate_class(%options);
100 if (my $traits = $options{traits}) {
101 if ( @traits = grep { not $class->does($_) } map {
102 Moose::Util::resolve_metatrait_alias( Attribute => $_ )
106 my $anon_class = Moose::Meta::Class->create_anon_class(
107 superclasses => [ $class ],
108 roles => [ @traits ],
112 $class = $anon_class->name;
116 return ( wantarray ? ( $class, @traits ) : $class );
121 my @legal_options_for_inheritance = qw(
122 default coerce required
123 documentation lazy handles
124 builder type_constraint
127 sub legal_options_for_inheritance { @legal_options_for_inheritance }
130 # This method *must* be able to handle
131 # Class::MOP::Attribute instances as
132 # well. Yes, I know that is wrong, but
133 # apparently we didn't realize it was
134 # doing that and now we have some code
135 # which is dependent on it. The real
136 # solution of course is to push this
137 # feature back up into Class::MOP::Attribute
138 # but I not right now, I am too lazy.
139 # However if you are reading this and
140 # looking for something to do,.. please
143 sub clone_and_inherit_options {
144 my ($self, %options) = @_;
151 # we may want to extends a Class::MOP::Attribute
152 # in which case we need to be able to use the
153 # core set of legal options that have always
154 # been here. But we allows Moose::Meta::Attribute
155 # instances to changes them.
157 my @legal_options = $self->can('legal_options_for_inheritance')
158 ? $self->legal_options_for_inheritance
159 : @legal_options_for_inheritance;
161 foreach my $legal_option (@legal_options) {
162 if (exists $options{$legal_option}) {
163 $actual_options{$legal_option} = $options{$legal_option};
164 delete $options{$legal_option};
170 if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) {
171 $type_constraint = $options{isa};
174 $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa});
175 (defined $type_constraint)
176 || confess "Could not find the type constraint '" . $options{isa} . "'";
179 $actual_options{type_constraint} = $type_constraint;
180 delete $options{isa};
183 if ($options{does}) {
185 if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) {
186 $type_constraint = $options{does};
189 $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does});
190 (defined $type_constraint)
191 || confess "Could not find the type constraint '" . $options{does} . "'";
194 $actual_options{type_constraint} = $type_constraint;
195 delete $options{does};
199 # this doesn't apply to Class::MOP::Attributes,
200 # so we can ignore it for them.
202 if ($self->can('interpolate_class')) {
203 ( $actual_options{metaclass}, my @traits ) = $self->interpolate_class(%options);
206 my @all_traits = grep { $seen{$_}++ } @{ $self->applied_traits || [] }, @traits;
207 $actual_options{traits} = \@all_traits if @all_traits;
209 delete @options{qw(metaclass traits)};
212 (scalar keys %options == 0)
213 || confess "Illegal inherited options => (" . (join ', ' => keys %options) . ")";
216 $self->clone(%actual_options);
220 my ( $self, %params ) = @_;
222 my $class = $params{metaclass} || ref $self;
224 if ( 0 and $class eq ref $self ) {
225 return $self->SUPER::clone(%params);
227 my ( @init, @non_init );
229 foreach my $attr ( grep { $_->has_value($self) } $self->meta->compute_all_applicable_attributes ) {
230 push @{ $attr->has_init_arg ? \@init : \@non_init }, $attr;
233 my %new_params = ( ( map { $_->init_arg => $_->get_value($self) } @init ), %params );
235 my $name = delete $new_params{name};
237 my $clone = $class->new($name, %new_params, __hack_no_process_options => 1 );
239 foreach my $attr ( @non_init ) {
240 $attr->set_value($clone, $attr->get_value($self));
248 sub _process_options {
249 my ($class, $name, $options) = @_;
251 if (exists $options->{is}) {
253 ### -------------------------
254 ## is => ro, writer => _foo # turns into (reader => foo, writer => _foo) as before
255 ## is => rw, writer => _foo # turns into (reader => foo, writer => _foo)
256 ## is => rw, accessor => _foo # turns into (accessor => _foo)
257 ## is => ro, accessor => _foo # error, accesor is rw
258 ### -------------------------
260 if ($options->{is} eq 'ro') {
261 confess "Cannot define an accessor name on a read-only attribute, accessors are read/write"
262 if exists $options->{accessor};
263 $options->{reader} ||= $name;
265 elsif ($options->{is} eq 'rw') {
266 if ($options->{writer}) {
267 $options->{reader} ||= $name;
270 $options->{accessor} ||= $name;
274 confess "I do not understand this option (is => " . $options->{is} . ") on attribute ($name)"
278 if (exists $options->{isa}) {
279 if (exists $options->{does}) {
280 if (eval { $options->{isa}->can('does') }) {
281 ($options->{isa}->does($options->{does}))
282 || confess "Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)";
285 confess "Cannot have an isa option which cannot ->does() on attribute ($name)";
289 # allow for anon-subtypes here ...
290 if (blessed($options->{isa}) && $options->{isa}->isa('Moose::Meta::TypeConstraint')) {
291 $options->{type_constraint} = $options->{isa};
294 $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa});
297 elsif (exists $options->{does}) {
298 # allow for anon-subtypes here ...
299 if (blessed($options->{does}) && $options->{does}->isa('Moose::Meta::TypeConstraint')) {
300 $options->{type_constraint} = $options->{does};
303 $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does});
307 if (exists $options->{coerce} && $options->{coerce}) {
308 (exists $options->{type_constraint})
309 || confess "You cannot have coercion without specifying a type constraint on attribute ($name)";
310 confess "You cannot have a weak reference to a coerced value on attribute ($name)"
311 if $options->{weak_ref};
314 if (exists $options->{trigger}) {
315 ('CODE' eq ref $options->{trigger})
316 || confess "Trigger must be a CODE ref on attribute ($name)";
319 if (exists $options->{auto_deref} && $options->{auto_deref}) {
320 (exists $options->{type_constraint})
321 || confess "You cannot auto-dereference without specifying a type constraint on attribute ($name)";
322 ($options->{type_constraint}->is_a_type_of('ArrayRef') ||
323 $options->{type_constraint}->is_a_type_of('HashRef'))
324 || confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)";
327 if (exists $options->{lazy_build} && $options->{lazy_build} == 1) {
328 confess("You can not use lazy_build and default for the same attribute ($name)")
329 if exists $options->{default};
330 $options->{lazy} = 1;
331 $options->{required} = 1;
332 $options->{builder} ||= "_build_${name}";
334 $options->{clearer} ||= "_clear${name}";
335 $options->{predicate} ||= "_has${name}";
338 $options->{clearer} ||= "clear_${name}";
339 $options->{predicate} ||= "has_${name}";
343 if (exists $options->{lazy} && $options->{lazy}) {
344 (exists $options->{default} || defined $options->{builder} )
345 || confess "You cannot have lazy attribute ($name) without specifying a default value for it";
348 if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) {
349 confess "You cannot have a required attribute ($name) without a default, builder, or an init_arg";
354 sub initialize_instance_slot {
355 my ($self, $meta_instance, $instance, $params) = @_;
356 my $init_arg = $self->init_arg();
357 # try to fetch the init arg from the %params ...
361 if ( defined($init_arg) and exists $params->{$init_arg}) {
362 $val = $params->{$init_arg};
366 # skip it if it's lazy
367 return if $self->is_lazy;
368 # and die if it's required and doesn't have a default value
369 confess "Attribute (" . $self->name . ") is required"
370 if $self->is_required && !$self->has_default && !$self->has_builder;
372 # if nothing was in the %params, we can use the
373 # attribute's default value (if it has one)
374 if ($self->has_default) {
375 $val = $self->default($instance);
378 elsif ($self->has_builder) {
379 if (my $builder = $instance->can($self->builder)){
380 $val = $instance->$builder;
384 confess(blessed($instance)." does not support builder method '".$self->builder."' for attribute '" . $self->name . "'");
389 return unless $value_is_set;
391 if ($self->has_type_constraint) {
392 my $type_constraint = $self->type_constraint;
393 if ($self->should_coerce && $type_constraint->has_coercion) {
394 $val = $type_constraint->coerce($val);
396 $type_constraint->check($val)
397 || confess "Attribute ("
399 . ") does not pass the type constraint because: "
400 . $type_constraint->get_message($val);
403 $self->set_initial_value($instance, $val);
404 $meta_instance->weaken_slot_value($instance, $self->name)
405 if ref $val && $self->is_weak_ref;
411 # this duplicates too much code from
412 # Class::MOP::Attribute, we need to
413 # refactor these bits eventually.
415 sub _set_initial_slot_value {
416 my ($self, $meta_instance, $instance, $value) = @_;
418 my $slot_name = $self->name;
420 return $meta_instance->set_slot_value($instance, $slot_name, $value)
421 unless $self->has_initializer;
423 my ($type_constraint, $can_coerce);
424 if ($self->has_type_constraint) {
425 $type_constraint = $self->type_constraint;
426 $can_coerce = ($self->should_coerce && $type_constraint->has_coercion);
431 if ($type_constraint) {
432 $val = $type_constraint->coerce($val)
434 $type_constraint->check($val)
435 || confess "Attribute ("
437 . ") does not pass the type constraint because: "
438 . $type_constraint->get_message($val);
440 $meta_instance->set_slot_value($instance, $slot_name, $val);
443 my $initializer = $self->initializer;
445 # most things will just want to set a value, so make it first arg
446 $instance->$initializer($value, $callback, $self);
450 my ($self, $instance, @args) = @_;
451 my $value = $args[0];
453 my $attr_name = $self->name;
455 if ($self->is_required and not @args) {
456 confess "Attribute ($attr_name) is required";
459 if ($self->has_type_constraint) {
461 my $type_constraint = $self->type_constraint;
463 if ($self->should_coerce) {
464 $value = $type_constraint->coerce($value);
466 $type_constraint->_compiled_type_constraint->($value)
467 || confess "Attribute ("
469 . ") does not pass the type constraint because "
470 . $type_constraint->get_message($value);
473 my $meta_instance = Class::MOP::Class->initialize(blessed($instance))
476 $meta_instance->set_slot_value($instance, $attr_name, $value);
478 if (ref $value && $self->is_weak_ref) {
479 $meta_instance->weaken_slot_value($instance, $attr_name);
482 if ($self->has_trigger) {
483 $self->trigger->($instance, $value, $self);
488 my ($self, $instance) = @_;
490 if ($self->is_lazy) {
491 unless ($self->has_value($instance)) {
493 if ($self->has_default) {
494 $value = $self->default($instance);
495 } elsif ( $self->has_builder ) {
496 if (my $builder = $instance->can($self->builder)){
497 $value = $instance->$builder;
500 confess(blessed($instance)
501 . " does not support builder method '"
503 . "' for attribute '"
508 if ($self->has_type_constraint) {
509 my $type_constraint = $self->type_constraint;
510 $value = $type_constraint->coerce($value)
511 if ($self->should_coerce);
512 $type_constraint->check($value)
513 || confess "Attribute (" . $self->name
514 . ") does not pass the type constraint because: "
515 . $type_constraint->get_message($value);
517 $self->set_initial_value($instance, $value);
521 if ($self->should_auto_deref) {
523 my $type_constraint = $self->type_constraint;
525 if ($type_constraint->is_a_type_of('ArrayRef')) {
526 my $rv = $self->SUPER::get_value($instance);
527 return unless defined $rv;
528 return wantarray ? @{ $rv } : $rv;
530 elsif ($type_constraint->is_a_type_of('HashRef')) {
531 my $rv = $self->SUPER::get_value($instance);
532 return unless defined $rv;
533 return wantarray ? %{ $rv } : $rv;
536 confess "Can not auto de-reference the type constraint '" . $type_constraint->name . "'";
542 return $self->SUPER::get_value($instance);
546 ## installing accessors
548 sub accessor_metaclass { 'Moose::Meta::Method::Accessor' }
550 sub install_accessors {
552 $self->SUPER::install_accessors(@_);
553 $self->install_delegation if $self->has_handles;
557 sub install_delegation {
561 # Here we canonicalize the 'handles' option
562 # this will sort out any details and always
563 # return an hash of methods which we want
564 # to delagate to, see that method for details
565 my %handles = $self->_canonicalize_handles;
567 # find the accessor method for this attribute
568 my $accessor = $self->_get_delegate_accessor;
570 # install the delegation ...
571 my $associated_class = $self->associated_class;
572 foreach my $handle (keys %handles) {
573 my $method_to_call = $handles{$handle};
574 my $class_name = $associated_class->name;
575 my $name = "${class_name}::${handle}";
577 (!$associated_class->has_method($handle))
578 || confess "You cannot overwrite a locally defined method ($handle) with a delegation";
581 # handles is not allowed to delegate
582 # any of these methods, as they will
583 # override the ones in your class, which
584 # is almost certainly not what you want.
586 # FIXME warn when $handle was explicitly specified, but not if the source is a regex or something
587 #cluck("Not delegating method '$handle' because it is a core method") and
588 next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle);
590 if ('CODE' eq ref($method_to_call)) {
591 $associated_class->add_method($handle => Class::MOP::subname($name, $method_to_call));
595 # we used to do a goto here, but the
596 # goto didn't handle failure correctly
597 # (it just returned nothing), so I took
598 # that out. However, the more I thought
599 # about it, the less I liked it doing
600 # the goto, and I prefered the act of
601 # delegation being actually represented
602 # in the stack trace.
604 $associated_class->add_method($handle => Class::MOP::subname($name, sub {
605 my $proxy = (shift)->$accessor();
607 || confess "Cannot delegate $handle to $method_to_call because " .
608 "the value of " . $self->name . " is not defined";
609 $proxy->$method_to_call(@_);
615 # private methods to help delegation ...
617 sub _get_delegate_accessor {
619 # find the accessor method for this attribute
620 my $accessor = $self->get_read_method_ref;
621 # then unpack it if we need too ...
622 $accessor = $accessor->body if blessed $accessor;
623 # return the accessor
627 sub _canonicalize_handles {
629 my $handles = $self->handles;
630 if (my $handle_type = ref($handles)) {
631 if ($handle_type eq 'HASH') {
634 elsif ($handle_type eq 'ARRAY') {
635 return map { $_ => $_ } @{$handles};
637 elsif ($handle_type eq 'Regexp') {
638 ($self->has_type_constraint)
639 || confess "Cannot delegate methods based on a RegExpr without a type constraint (isa)";
640 return map { ($_ => $_) }
641 grep { /$handles/ } $self->_get_delegate_method_list;
643 elsif ($handle_type eq 'CODE') {
644 return $handles->($self, $self->_find_delegate_metaclass);
647 confess "Unable to canonicalize the 'handles' option with $handles";
651 my $role_meta = eval { $handles->meta };
653 confess "Unable to canonicalize the 'handles' option with $handles because : $@";
656 (blessed $role_meta && $role_meta->isa('Moose::Meta::Role'))
657 || confess "Unable to canonicalize the 'handles' option with $handles because ->meta is not a Moose::Meta::Role";
659 return map { $_ => $_ } (
660 $role_meta->get_method_list,
661 $role_meta->get_required_method_list
666 sub _find_delegate_metaclass {
668 if (my $class = $self->_isa_metadata) {
669 # if the class does have
670 # a meta method, use it
671 return $class->meta if $class->can('meta');
672 # otherwise we might be
673 # dealing with a non-Moose
674 # class, and need to make
676 return Moose::Meta::Class->initialize($class);
678 elsif (my $role = $self->_does_metadata) {
679 # our role will always have
684 confess "Cannot find delegate metaclass for attribute " . $self->name;
688 sub _get_delegate_method_list {
690 my $meta = $self->_find_delegate_metaclass;
691 if ($meta->isa('Class::MOP::Class')) {
692 return map { $_->name } # NOTE: !never! delegate &meta
693 grep { $_->package_name ne 'Moose::Object' && $_->name ne 'meta' }
694 $meta->get_all_methods;
696 elsif ($meta->isa('Moose::Meta::Role')) {
697 return $meta->get_method_list;
700 confess "Unable to recognize the delegate metaclass '$meta'";
704 package Moose::Meta::Attribute::Custom::Moose;
705 sub register_implementation { 'Moose::Meta::Attribute' }
715 Moose::Meta::Attribute - The Moose attribute metaclass
719 This is a subclass of L<Class::MOP::Attribute> with Moose specific
722 For the most part, the only time you will ever encounter an
723 instance of this class is if you are doing some serious deep
724 introspection. To really understand this class, you need to refer
725 to the L<Class::MOP::Attribute> documentation.
729 =head2 Overridden methods
731 These methods override methods in L<Class::MOP::Attribute> and add
732 Moose specific features. You can safely assume though that they
733 will behave just as L<Class::MOP::Attribute> does.
743 =item B<initialize_instance_slot>
745 =item B<install_accessors>
747 =item B<install_delegation>
749 =item B<accessor_metaclass>
755 eval { $point->meta->get_attribute('x')->set_value($point, 'fourty-two') };
760 I<Attribute (x) does not pass the type constraint (Int) with 'fourty-two'>
762 Before setting the value, a check is made on the type constraint of
763 the attribute, if it has one, to see if the value passes it. If the
764 value fails to pass, the set operation dies with a L<Carp/confess>.
766 Any coercion to convert values is done before checking the type constraint.
768 To check a value against a type constraint before setting it, fetch the
769 attribute instance using L<Class::MOP::Class/find_attribute_by_name>,
770 fetch the type_constraint from the attribute using L<Moose::Meta::Attribute/type_constraint>
771 and call L<Moose::Meta::TypeConstraint/check>. See L<Moose::Cookbook::Basics::Recipe4>
776 =head2 Additional Moose features
778 Moose attributes support type-constraint checking, weak reference
779 creation and type coercion.
783 =item B<interpolate_class_and_new>
785 =item B<interpolate_class>
787 When called as a class method causes interpretation of the C<metaclass> and
790 =item B<clone_and_inherit_options>
792 This is to support the C<has '+foo'> feature, it clones an attribute
793 from a superclass and allows a very specific set of changes to be made
796 =item B<legal_options_for_inheritance>
798 Whitelist with options you can change. You can overload it in your custom
799 metaclass to allow your options be inheritable.
801 =item B<has_type_constraint>
803 Returns true if this meta-attribute has a type constraint.
805 =item B<type_constraint>
807 A read-only accessor for this meta-attribute's type constraint. For
808 more information on what you can do with this, see the documentation
809 for L<Moose::Meta::TypeConstraint>.
813 Returns true if this meta-attribute performs delegation.
817 This returns the value which was passed into the handles option.
821 Returns true if this meta-attribute produces a weak reference.
825 Returns true if this meta-attribute is required to have a value.
829 Returns true if this meta-attribute should be initialized lazily.
831 NOTE: lazy attributes, B<must> have a C<default> or C<builder> field set.
833 =item B<is_lazy_build>
835 Returns true if this meta-attribute should be initialized lazily through
836 the builder generated by lazy_build. Using C<lazy_build =E<gt> 1> will
837 make your attribute required and lazy. In addition it will set the builder, clearer
838 and predicate options for you using the following convention.
840 #If your attribute name starts with an underscore:
841 has '_foo' => (lazy_build => 1);
843 has '_foo' => (lazy => 1, required => 1, predicate => '_has_foo', clearer => '_clear_foo', builder => '_build__foo');
845 has '_foo' => (lazy => 1, required => 1, predicate => '_has_foo', clearer => '_clear_foo', default => sub{shift->_build__foo});
847 #If your attribute name does not start with an underscore:
848 has 'foo' => (lazy_build => 1);
850 has 'foo' => (lazy => 1, required => 1, predicate => 'has_foo', clearer => 'clear_foo', builder => '_build_foo');
852 has 'foo' => (lazy => 1, required => 1, predicate => 'has_foo', clearer => 'clear_foo', default => sub{shift->_build_foo});
854 The reason for the different naming of the C<builder> is that the C<builder>
855 method is a private method while the C<clearer> and C<predicate> methods
858 NOTE: This means your class should provide a method whose name matches the value
859 of the builder part, in this case _build__foo or _build_foo.
861 =item B<should_coerce>
863 Returns true if this meta-attribute should perform type coercion.
865 =item B<should_auto_deref>
867 Returns true if this meta-attribute should perform automatic
870 NOTE: This can only be done for attributes whose type constraint is
871 either I<ArrayRef> or I<HashRef>.
875 Returns true if this meta-attribute has a trigger set.
879 This is a CODE reference which will be executed every time the
880 value of an attribute is assigned. The CODE ref will get two values,
881 the invocant and the new value. This can be used to handle I<basic>
882 bi-directional relations.
884 =item B<documentation>
886 This is a string which contains the documentation for this attribute.
887 It serves no direct purpose right now, but it might in the future
888 in some kind of automated documentation system perhaps.
890 =item B<has_documentation>
892 Returns true if this meta-attribute has any documentation.
894 =item B<applied_traits>
896 This will return the ARRAY ref of all the traits applied to this
897 attribute, or if no traits have been applied, it returns C<undef>.
899 =item B<has_applied_traits>
901 Returns true if this meta-attribute has any traits applied.
907 All complex software has bugs lurking in it, and this module is no
908 exception. If you find a bug please either email me, or add the bug
913 Stevan Little E<lt>stevan@iinteractive.comE<gt>
915 Yuval Kogman E<lt>nothingmuch@woobling.comE<gt>
917 =head1 COPYRIGHT AND LICENSE
919 Copyright 2006-2008 by Infinity Interactive, Inc.
921 L<http://www.iinteractive.com>
923 This library is free software; you can redistribute it and/or modify
924 it under the same terms as Perl itself.