2 package Class::MOP::Class;
7 use Class::MOP::Immutable;
8 use Class::MOP::Instance;
9 use Class::MOP::Method::Wrapped;
12 use Scalar::Util 'blessed', 'weaken';
14 our $VERSION = '0.65';
15 $VERSION = eval $VERSION;
16 our $AUTHORITY = 'cpan:STEVAN';
18 use base 'Class::MOP::Module';
28 $package_name = shift;
31 $package_name = $options{package};
34 (defined $package_name && $package_name && !ref($package_name))
35 || confess "You must pass a package name and it cannot be blessed";
37 return Class::MOP::get_metaclass_by_name($package_name)
38 || $class->construct_class_instance(package => $package_name, @_);
41 # NOTE: (meta-circularity)
42 # this is a special form of &construct_instance
43 # (see below), which is used to construct class
44 # meta-object instances for any Class::MOP::*
45 # class. All other classes will use the more
46 # normal &construct_instance.
47 sub construct_class_instance {
49 my $options = @_ == 1 ? $_[0] : {@_};
50 my $package_name = $options->{package};
51 (defined $package_name && $package_name)
52 || confess "You must pass a package name";
54 # return the metaclass if we have it cached,
55 # and it is still defined (it has not been
56 # reaped by DESTROY yet, which can happen
57 # annoyingly enough during global destruction)
59 if (defined(my $meta = Class::MOP::get_metaclass_by_name($package_name))) {
64 # we need to deal with the possibility
65 # of class immutability here, and then
66 # get the name of the class appropriately
68 ? ($class->is_immutable
69 ? $class->get_mutable_metaclass_name()
73 # now create the metaclass
75 if ($class eq 'Class::MOP::Class') {
77 $meta = $class->_new($options)
81 # it is safe to use meta here because
82 # class will always be a subclass of
83 # Class::MOP::Class, which defines meta
84 $meta = $class->meta->construct_instance($options)
87 # and check the metaclass compatibility
88 $meta->check_metaclass_compatability();
90 Class::MOP::store_metaclass_by_name($package_name, $meta);
93 # we need to weaken any anon classes
94 # so that they can call DESTROY properly
95 Class::MOP::weaken_metaclass($package_name) if $meta->is_anon_class;
102 my $options = @_ == 1 ? $_[0] : {@_};
105 # inherited from Class::MOP::Package
106 'package' => $options->{package},
109 # since the following attributes will
110 # actually be loaded from the symbol
111 # table, and actually bypass the instance
112 # entirely, we can just leave these things
113 # listed here for reference, because they
114 # should not actually have a value associated
116 'namespace' => \undef,
117 # inherited from Class::MOP::Module
119 'authority' => \undef,
120 # defined in Class::MOP::Class
121 'superclasses' => \undef,
125 'attribute_metaclass' => $options->{'attribute_metaclass'} || 'Class::MOP::Attribute',
126 'method_metaclass' => $options->{'method_metaclass'} || 'Class::MOP::Method',
127 'instance_metaclass' => $options->{'instance_metaclass'} || 'Class::MOP::Instance',
131 sub reset_package_cache_flag { (shift)->{'_package_cache_flag'} = undef }
132 sub update_package_cache_flag {
135 # we can manually update the cache number
136 # since we are actually adding the method
137 # to our cache as well. This avoids us
138 # having to regenerate the method_map.
140 $self->{'_package_cache_flag'} = Class::MOP::check_package_cache_flag($self->name);
143 sub check_metaclass_compatability {
146 # this is always okay ...
147 return if ref($self) eq 'Class::MOP::Class' &&
148 $self->instance_metaclass eq 'Class::MOP::Instance';
150 my @class_list = $self->linearized_isa;
151 shift @class_list; # shift off $self->name
153 foreach my $class_name (@class_list) {
154 my $meta = Class::MOP::get_metaclass_by_name($class_name) || next;
157 # we need to deal with the possibility
158 # of class immutability here, and then
159 # get the name of the class appropriately
160 my $meta_type = ($meta->is_immutable
161 ? $meta->get_mutable_metaclass_name()
164 ($self->isa($meta_type))
165 || confess $self->name . "->meta => (" . (ref($self)) . ")" .
166 " is not compatible with the " .
167 $class_name . "->meta => (" . ($meta_type) . ")";
169 # we also need to check that instance metaclasses
170 # are compatabile in the same the class.
171 ($self->instance_metaclass->isa($meta->instance_metaclass))
172 || confess $self->name . "->meta->instance_metaclass => (" . ($self->instance_metaclass) . ")" .
173 " is not compatible with the " .
174 $class_name . "->meta->instance_metaclass => (" . ($meta->instance_metaclass) . ")";
182 # this should be sufficient, if you have a
183 # use case where it is not, write a test and
185 my $ANON_CLASS_SERIAL = 0;
188 # we need a sufficiently annoying prefix
189 # this should suffice for now, this is
190 # used in a couple of places below, so
191 # need to put it up here for now.
192 my $ANON_CLASS_PREFIX = 'Class::MOP::Class::__ANON__::SERIAL::';
196 no warnings 'uninitialized';
197 $self->name =~ /^$ANON_CLASS_PREFIX/;
200 sub create_anon_class {
201 my ($class, %options) = @_;
202 my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL;
203 return $class->create($package_name, %options);
207 # this will only get called for
208 # anon-classes, all other calls
209 # are assumed to occur during
210 # global destruction and so don't
211 # really need to be handled explicitly
215 return if Class::MOP::in_global_destruction(); # it'll happen soon anyway and this just makes things more complicated
217 no warnings 'uninitialized';
218 return unless $self->name =~ /^$ANON_CLASS_PREFIX/;
219 my ($serial_id) = ($self->name =~ /^$ANON_CLASS_PREFIX(\d+)/);
221 foreach my $key (keys %{$ANON_CLASS_PREFIX . $serial_id}) {
222 delete ${$ANON_CLASS_PREFIX . $serial_id}{$key};
224 delete ${'main::' . $ANON_CLASS_PREFIX}{$serial_id . '::'};
229 # creating classes with MOP ...
232 my ( $class, @args ) = @_;
234 unshift @args, 'package' if @args % 2 == 1;
236 my (%options) = @args;
237 my $package_name = $options{package};
239 (defined $package_name && $package_name)
240 || confess "You must pass a package name";
242 (ref $options{superclasses} eq 'ARRAY')
243 || confess "You must pass an ARRAY ref of superclasses"
244 if exists $options{superclasses};
246 (ref $options{attributes} eq 'ARRAY')
247 || confess "You must pass an ARRAY ref of attributes"
248 if exists $options{attributes};
250 (ref $options{methods} eq 'HASH')
251 || confess "You must pass an HASH ref of methods"
252 if exists $options{methods};
254 my $code = "package $package_name;";
255 $code .= "\$$package_name\:\:VERSION = '" . $options{version} . "';"
256 if exists $options{version};
257 $code .= "\$$package_name\:\:AUTHORITY = '" . $options{authority} . "';"
258 if exists $options{authority};
261 confess "creation of $package_name failed : $@" if $@;
263 my $meta = $class->initialize($package_name);
266 $meta->add_method('meta' => sub {
267 $class->initialize(ref($_[0]) || $_[0]);
270 $meta->superclasses(@{$options{superclasses}})
271 if exists $options{superclasses};
273 # process attributes first, so that they can
274 # install accessors, but locally defined methods
275 # can then overwrite them. It is maybe a little odd, but
276 # I think this should be the order of things.
277 if (exists $options{attributes}) {
278 foreach my $attr (@{$options{attributes}}) {
279 $meta->add_attribute($attr);
282 if (exists $options{methods}) {
283 foreach my $method_name (keys %{$options{methods}}) {
284 $meta->add_method($method_name, $options{methods}->{$method_name});
293 # all these attribute readers will be bootstrapped
294 # away in the Class::MOP bootstrap section
296 sub get_attribute_map { $_[0]->{'attributes'} }
297 sub attribute_metaclass { $_[0]->{'attribute_metaclass'} }
298 sub method_metaclass { $_[0]->{'method_metaclass'} }
299 sub instance_metaclass { $_[0]->{'instance_metaclass'} }
302 # this is a prime canidate for conversion to XS
306 my $current = Class::MOP::check_package_cache_flag($self->name);
308 if (defined $self->{'_package_cache_flag'} && $self->{'_package_cache_flag'} == $current) {
309 return $self->{'methods'} ||= {};
312 $self->{_package_cache_flag} = $current;
314 my $map = $self->{'methods'} ||= {};
316 my $class_name = $self->name;
317 my $method_metaclass = $self->method_metaclass;
319 my %all_code = $self->get_all_package_symbols('CODE');
321 foreach my $symbol (keys %all_code) {
322 my $code = $all_code{$symbol};
324 next if exists $map->{$symbol} &&
325 defined $map->{$symbol} &&
326 $map->{$symbol}->body == $code;
328 my ($pkg, $name) = Class::MOP::get_code_info($code);
331 # in 5.10 constant.pm the constants show up
332 # as being in the right package, but in pre-5.10
333 # they show up as constant::__ANON__ so we
334 # make an exception here to be sure that things
335 # work as expected in both.
337 unless ($pkg eq 'constant' && $name eq '__ANON__') {
338 next if ($pkg || '') ne $class_name ||
339 (($name || '') ne '__ANON__' && ($pkg || '') ne $class_name);
342 $map->{$symbol} = $method_metaclass->wrap(
344 associated_metaclass => $self,
345 package_name => $class_name,
353 # Instance Construction & Cloning
359 # we need to protect the integrity of the
360 # Class::MOP::Class singletons here, so we
361 # delegate this to &construct_class_instance
362 # which will deal with the singletons
363 return $class->construct_class_instance(@_)
364 if $class->name->isa('Class::MOP::Class');
365 return $class->construct_instance(@_);
368 sub construct_instance {
370 my $params = @_ == 1 ? $_[0] : {@_};
371 my $meta_instance = $class->get_meta_instance();
372 my $instance = $meta_instance->create_instance();
373 foreach my $attr ($class->compute_all_applicable_attributes()) {
374 $attr->initialize_instance_slot($meta_instance, $instance, $params);
377 # this will only work for a HASH instance type
378 if ($class->is_anon_class) {
379 (Scalar::Util::reftype($instance) eq 'HASH')
380 || confess "Currently only HASH based instances are supported with instance of anon-classes";
382 # At some point we should make this official
383 # as a reserved slot name, but right now I am
384 # going to keep it here.
385 # my $RESERVED_MOP_SLOT = '__MOP__';
386 $instance->{'__MOP__'} = $class;
392 sub get_meta_instance {
394 $self->{'_meta_instance'} ||= $self->create_meta_instance();
397 sub create_meta_instance {
400 my $instance = $self->instance_metaclass->new(
401 associated_metaclass => $self,
402 attributes => [ $self->compute_all_applicable_attributes() ],
405 $self->add_meta_instance_dependencies()
406 if $instance->is_dependent_on_superclasses();
413 my $instance = shift;
414 (blessed($instance) && $instance->isa($class->name))
415 || confess "You must pass an instance of the metaclass (" . (ref $class ? $class->name : $class) . "), not ($instance)";
418 # we need to protect the integrity of the
419 # Class::MOP::Class singletons here, they
420 # should not be cloned.
421 return $instance if $instance->isa('Class::MOP::Class');
422 $class->clone_instance($instance, @_);
426 my ($class, $instance, %params) = @_;
428 || confess "You can only clone instances, ($instance) is not a blessed instance";
429 my $meta_instance = $class->get_meta_instance();
430 my $clone = $meta_instance->clone_instance($instance);
431 foreach my $attr ($class->compute_all_applicable_attributes()) {
432 if ( defined( my $init_arg = $attr->init_arg ) ) {
433 if (exists $params{$init_arg}) {
434 $attr->set_value($clone, $params{$init_arg});
441 sub rebless_instance {
442 my ($self, $instance, %params) = @_;
445 if ($instance->can('meta')) {
446 ($instance->meta->isa('Class::MOP::Class'))
447 || confess 'Cannot rebless instance if ->meta is not an instance of Class::MOP::Class';
448 $old_metaclass = $instance->meta;
451 $old_metaclass = $self->initialize(ref($instance));
454 my $meta_instance = $self->get_meta_instance();
456 $self->name->isa($old_metaclass->name)
457 || confess "You may rebless only into a subclass of (". $old_metaclass->name ."), of which (". $self->name .") isn't.";
460 $meta_instance->rebless_instance_structure($instance, $self);
462 foreach my $attr ( $self->compute_all_applicable_attributes ) {
463 if ( $attr->has_value($instance) ) {
464 if ( defined( my $init_arg = $attr->init_arg ) ) {
465 $params{$init_arg} = $attr->get_value($instance)
466 unless exists $params{$init_arg};
469 $attr->set_value($instance, $attr->get_value($instance));
474 foreach my $attr ($self->compute_all_applicable_attributes) {
475 $attr->initialize_instance_slot($meta_instance, $instance, \%params);
485 my $var_spec = { sigil => '@', type => 'ARRAY', name => 'ISA' };
488 @{$self->get_package_symbol($var_spec)} = @supers;
490 # we need to check the metaclass
491 # compatibility here so that we can
492 # be sure that the superclass is
493 # not potentially creating an issues
494 # we don't know about
495 $self->check_metaclass_compatability();
496 $self->update_meta_instance_dependencies();
498 @{$self->get_package_symbol($var_spec)};
504 my $super_class = $self->name;
506 if ( Class::MOP::HAVE_ISAREV() ) {
507 return @{ $super_class->mro::get_isarev() };
511 my $find_derived_classes;
512 $find_derived_classes = sub {
513 my ($outer_class) = @_;
515 my $symbol_table_hashref = do { no strict 'refs'; \%{"${outer_class}::"} };
518 for my $symbol ( keys %$symbol_table_hashref ) {
519 next SYMBOL if $symbol !~ /\A (\w+):: \z/x;
520 my $inner_class = $1;
522 next SYMBOL if $inner_class eq 'SUPER'; # skip '*::SUPER'
526 ? "${outer_class}::$inner_class"
529 if ( $class->isa($super_class) and $class ne $super_class ) {
530 push @derived_classes, $class;
533 next SYMBOL if $class eq 'main'; # skip 'main::*'
535 $find_derived_classes->($class);
539 my $root_class = q{};
540 $find_derived_classes->($root_class);
542 undef $find_derived_classes;
544 @derived_classes = sort { $a->isa($b) ? 1 : $b->isa($a) ? -1 : 0 } @derived_classes;
546 return @derived_classes;
552 return @{ mro::get_linear_isa( (shift)->name ) };
555 sub class_precedence_list {
557 my $name = $self->name;
559 unless (Class::MOP::IS_RUNNING_ON_5_10()) {
561 # We need to check for circular inheritance here
562 # if we are are not on 5.10, cause 5.8 detects it
563 # late. This will do nothing if all is well, and
564 # blow up otherwise. Yes, it's an ugly hack, better
565 # suggestions are welcome.
567 ($name || return)->isa('This is a test for circular inheritance')
570 # if our mro is c3, we can
571 # just grab the linear_isa
572 if (mro::get_mro($name) eq 'c3') {
573 return @{ mro::get_linear_isa($name) }
577 # we can't grab the linear_isa for dfs
578 # since it has all the duplicates
583 $self->initialize($_)->class_precedence_list()
584 } $self->superclasses()
591 sub wrap_method_body {
592 my ( $self, %args ) = @_;
594 my $body = delete $args{body}; # delete is for compat
596 ('CODE' eq ref($body))
597 || confess "Your code block must be a CODE reference";
599 $self->method_metaclass->wrap( $body => (
600 package_name => $self->name,
606 my ($self, $method_name, $method) = @_;
607 (defined $method_name && $method_name)
608 || confess "You must define a method name";
611 if (blessed($method)) {
612 $body = $method->body;
613 if ($method->package_name ne $self->name &&
614 $method->name ne $method_name) {
615 warn "CLONING method\n";
616 $method = $method->clone(
617 package_name => $self->name,
619 ) if $method->can('clone');
624 $method = $self->wrap_method_body( body => $body, name => $method_name );
627 $method->attach_to_class($self);
629 $self->get_method_map->{$method_name} = $method;
631 my $full_method_name = ($self->name . '::' . $method_name);
632 $self->add_package_symbol(
633 { sigil => '&', type => 'CODE', name => $method_name },
634 Class::MOP::subname($full_method_name => $body)
637 $self->update_package_cache_flag; # still valid, since we just added the method to the map, and if it was invalid before that then get_method_map updated it
641 my $fetch_and_prepare_method = sub {
642 my ($self, $method_name) = @_;
644 my $method = $self->get_method($method_name);
645 # if we dont have local ...
647 # try to find the next method
648 $method = $self->find_next_method_by_name($method_name);
649 # die if it does not exist
651 || confess "The method '$method_name' is not found in the inheritance hierarchy for class " . $self->name;
652 # and now make sure to wrap it
653 # even if it is already wrapped
654 # because we need a new sub ref
655 $method = Class::MOP::Method::Wrapped->wrap($method);
658 # now make sure we wrap it properly
659 $method = Class::MOP::Method::Wrapped->wrap($method)
660 unless $method->isa('Class::MOP::Method::Wrapped');
662 $self->add_method($method_name => $method);
666 sub add_before_method_modifier {
667 my ($self, $method_name, $method_modifier) = @_;
668 (defined $method_name && $method_name)
669 || confess "You must pass in a method name";
670 my $method = $fetch_and_prepare_method->($self, $method_name);
671 $method->add_before_modifier(
672 Class::MOP::subname(':before' => $method_modifier)
676 sub add_after_method_modifier {
677 my ($self, $method_name, $method_modifier) = @_;
678 (defined $method_name && $method_name)
679 || confess "You must pass in a method name";
680 my $method = $fetch_and_prepare_method->($self, $method_name);
681 $method->add_after_modifier(
682 Class::MOP::subname(':after' => $method_modifier)
686 sub add_around_method_modifier {
687 my ($self, $method_name, $method_modifier) = @_;
688 (defined $method_name && $method_name)
689 || confess "You must pass in a method name";
690 my $method = $fetch_and_prepare_method->($self, $method_name);
691 $method->add_around_modifier(
692 Class::MOP::subname(':around' => $method_modifier)
697 # the methods above used to be named like this:
698 # ${pkg}::${method}:(before|after|around)
699 # but this proved problematic when using one modifier
700 # to wrap multiple methods (something which is likely
701 # to happen pretty regularly IMO). So instead of naming
702 # it like this, I have chosen to just name them purely
703 # with their modifier names, like so:
704 # :(before|after|around)
705 # The fact is that in a stack trace, it will be fairly
706 # evident from the context what method they are attached
707 # to, and so don't need the fully qualified name.
713 $self->add_method(@_);
717 my ($self, $method_name) = @_;
718 (defined $method_name && $method_name)
719 || confess "You must define a method name";
721 exists $self->get_method_map->{$method_name};
725 my ($self, $method_name) = @_;
726 (defined $method_name && $method_name)
727 || confess "You must define a method name";
730 # I don't really need this here, because
731 # if the method_map is missing a key it
732 # will just return undef for me now
733 # return unless $self->has_method($method_name);
735 return $self->get_method_map->{$method_name};
739 my ($self, $method_name) = @_;
740 (defined $method_name && $method_name)
741 || confess "You must define a method name";
743 my $removed_method = delete $self->get_method_map->{$method_name};
745 $self->remove_package_symbol(
746 { sigil => '&', type => 'CODE', name => $method_name }
749 $removed_method->detach_from_class if $removed_method;
751 $self->update_package_cache_flag; # still valid, since we just removed the method from the map
753 return $removed_method;
756 sub get_method_list {
758 keys %{$self->get_method_map};
761 sub find_method_by_name {
762 my ($self, $method_name) = @_;
763 (defined $method_name && $method_name)
764 || confess "You must define a method name to find";
765 foreach my $class ($self->linearized_isa) {
766 # fetch the meta-class ...
767 my $meta = $self->initialize($class);
768 return $meta->get_method($method_name)
769 if $meta->has_method($method_name);
774 sub get_all_methods {
776 my %methods = map { %{ $self->initialize($_)->get_method_map } } reverse $self->linearized_isa;
777 return values %methods;
781 sub compute_all_applicable_methods {
785 class => $_->package_name,
786 code => $_, # sigh, overloading
788 } shift->get_all_methods(@_);
791 sub find_all_methods_by_name {
792 my ($self, $method_name) = @_;
793 (defined $method_name && $method_name)
794 || confess "You must define a method name to find";
796 foreach my $class ($self->linearized_isa) {
797 # fetch the meta-class ...
798 my $meta = $self->initialize($class);
800 name => $method_name,
802 code => $meta->get_method($method_name)
803 } if $meta->has_method($method_name);
808 sub find_next_method_by_name {
809 my ($self, $method_name) = @_;
810 (defined $method_name && $method_name)
811 || confess "You must define a method name to find";
812 my @cpl = $self->linearized_isa;
813 shift @cpl; # discard ourselves
814 foreach my $class (@cpl) {
815 # fetch the meta-class ...
816 my $meta = $self->initialize($class);
817 return $meta->get_method($method_name)
818 if $meta->has_method($method_name);
827 # either we have an attribute object already
828 # or we need to create one from the args provided
829 my $attribute = blessed($_[0]) ? $_[0] : $self->attribute_metaclass->new(@_);
830 # make sure it is derived from the correct type though
831 ($attribute->isa('Class::MOP::Attribute'))
832 || confess "Your attribute must be an instance of Class::MOP::Attribute (or a subclass)";
834 # first we attach our new attribute
835 # because it might need certain information
836 # about the class which it is attached to
837 $attribute->attach_to_class($self);
839 # then we remove attributes of a conflicting
840 # name here so that we can properly detach
841 # the old attr object, and remove any
842 # accessors it would have generated
843 if ( $self->has_attribute($attribute->name) ) {
844 $self->remove_attribute($attribute->name);
846 $self->invalidate_meta_instances();
849 # then onto installing the new accessors
850 $self->get_attribute_map->{$attribute->name} = $attribute;
852 # invalidate package flag here
853 my $e = do { local $@; eval { $attribute->install_accessors() }; $@ };
855 $self->remove_attribute($attribute->name);
862 sub update_meta_instance_dependencies {
865 if ( $self->{meta_instance_dependencies} ) {
866 return $self->add_meta_instance_dependencies;
870 sub add_meta_instance_dependencies {
873 $self->remove_meta_instance_depdendencies;
875 my @attrs = $self->compute_all_applicable_attributes();
878 my @classes = grep { not $seen{$_->name}++ } map { $_->associated_class } @attrs;
880 foreach my $class ( @classes ) {
881 $class->add_dependent_meta_instance($self);
884 $self->{meta_instance_dependencies} = \@classes;
887 sub remove_meta_instance_depdendencies {
890 if ( my $classes = delete $self->{meta_instance_dependencies} ) {
891 foreach my $class ( @$classes ) {
892 $class->remove_dependent_meta_instance($self);
902 sub add_dependent_meta_instance {
903 my ( $self, $metaclass ) = @_;
904 push @{ $self->{dependent_meta_instances} }, $metaclass;
907 sub remove_dependent_meta_instance {
908 my ( $self, $metaclass ) = @_;
909 my $name = $metaclass->name;
910 @$_ = grep { $_->name ne $name } @$_ for $self->{dependent_meta_instances};
913 sub invalidate_meta_instances {
915 $_->invalidate_meta_instance() for $self, @{ $self->{dependent_meta_instances} };
918 sub invalidate_meta_instance {
920 undef $self->{_meta_instance};
924 my ($self, $attribute_name) = @_;
925 (defined $attribute_name && $attribute_name)
926 || confess "You must define an attribute name";
927 exists $self->get_attribute_map->{$attribute_name};
931 my ($self, $attribute_name) = @_;
932 (defined $attribute_name && $attribute_name)
933 || confess "You must define an attribute name";
934 return $self->get_attribute_map->{$attribute_name}
936 # this will return undef anyway, so no need ...
937 # if $self->has_attribute($attribute_name);
941 sub remove_attribute {
942 my ($self, $attribute_name) = @_;
943 (defined $attribute_name && $attribute_name)
944 || confess "You must define an attribute name";
945 my $removed_attribute = $self->get_attribute_map->{$attribute_name};
946 return unless defined $removed_attribute;
947 delete $self->get_attribute_map->{$attribute_name};
948 $self->invalidate_meta_instances();
949 $removed_attribute->remove_accessors();
950 $removed_attribute->detach_from_class();
951 return $removed_attribute;
954 sub get_attribute_list {
956 keys %{$self->get_attribute_map};
959 sub get_all_attributes {
960 shift->compute_all_applicable_attributes(@_);
963 sub compute_all_applicable_attributes {
965 my %attrs = map { %{ $self->initialize($_)->get_attribute_map } } reverse $self->linearized_isa;
966 return values %attrs;
969 sub find_attribute_by_name {
970 my ($self, $attr_name) = @_;
971 foreach my $class ($self->linearized_isa) {
972 # fetch the meta-class ...
973 my $meta = $self->initialize($class);
974 return $meta->get_attribute($attr_name)
975 if $meta->has_attribute($attr_name);
980 # check if we can reinitialize
984 # if any local attr is defined
985 return if $self->get_attribute_list;
987 # or any non-declared methods
988 if ( my @methods = values %{ $self->get_method_map } ) {
989 my $metaclass = $self->method_metaclass;
990 foreach my $method ( @methods ) {
991 return if $method->isa("Class::MOP::Method::Generated");
992 # FIXME do we need to enforce this too? return unless $method->isa($metaclass);
1001 sub is_mutable { 1 }
1002 sub is_immutable { 0 }
1005 # Why I changed this (groditi)
1006 # - One Metaclass may have many Classes through many Metaclass instances
1007 # - One Metaclass should only have one Immutable Transformer instance
1008 # - Each Class may have different Immutabilizing options
1009 # - Therefore each Metaclass instance may have different Immutabilizing options
1010 # - We need to store one Immutable Transformer instance per Metaclass
1011 # - We need to store one set of Immutable Transformer options per Class
1012 # - Upon make_mutable we may delete the Immutabilizing options
1013 # - We could clean the immutable Transformer instance when there is no more
1014 # immutable Classes of that type, but we can also keep it in case
1015 # another class with this same Metaclass becomes immutable. It is a case
1016 # of trading of storing an instance to avoid unnecessary instantiations of
1017 # Immutable Transformers. You may view this as a memory leak, however
1018 # Because we have few Metaclasses, in practice it seems acceptable
1019 # - To allow Immutable Transformers instances to be cleaned up we could weaken
1020 # the reference stored in $IMMUTABLE_TRANSFORMERS{$class} and ||= should DWIM
1024 my %IMMUTABLE_TRANSFORMERS;
1025 my %IMMUTABLE_OPTIONS;
1027 sub get_immutable_options {
1029 return if $self->is_mutable;
1030 confess "unable to find immutabilizing options"
1031 unless exists $IMMUTABLE_OPTIONS{$self->name};
1032 my %options = %{$IMMUTABLE_OPTIONS{$self->name}};
1033 delete $options{IMMUTABLE_TRANSFORMER};
1037 sub get_immutable_transformer {
1039 if( $self->is_mutable ){
1040 my $class = ref $self || $self;
1041 return $IMMUTABLE_TRANSFORMERS{$class} ||= $self->create_immutable_transformer;
1043 confess "unable to find transformer for immutable class"
1044 unless exists $IMMUTABLE_OPTIONS{$self->name};
1045 return $IMMUTABLE_OPTIONS{$self->name}->{IMMUTABLE_TRANSFORMER};
1048 sub make_immutable {
1052 my $transformer = $self->get_immutable_transformer;
1053 $transformer->make_metaclass_immutable($self, \%options);
1054 $IMMUTABLE_OPTIONS{$self->name} =
1055 { %options, IMMUTABLE_TRANSFORMER => $transformer };
1057 if( exists $options{debug} && $options{debug} ){
1058 print STDERR "# of Metaclass options: ", keys %IMMUTABLE_OPTIONS;
1059 print STDERR "# of Immutable transformers: ", keys %IMMUTABLE_TRANSFORMERS;
1067 return if $self->is_mutable;
1068 my $options = delete $IMMUTABLE_OPTIONS{$self->name};
1069 confess "unable to find immutabilizing options" unless ref $options;
1070 my $transformer = delete $options->{IMMUTABLE_TRANSFORMER};
1071 $transformer->make_metaclass_mutable($self, $options);
1076 sub create_immutable_transformer {
1078 my $class = Class::MOP::Immutable->new($self, {
1079 read_only => [qw/superclasses/],
1086 remove_package_symbol
1089 class_precedence_list => 'ARRAY',
1090 linearized_isa => 'ARRAY', # FIXME perl 5.10 memoizes this on its own, no need?
1091 get_all_methods => 'ARRAY',
1092 #get_all_attributes => 'ARRAY', # it's an alias, no need, but maybe in the future
1093 compute_all_applicable_attributes => 'ARRAY',
1094 get_meta_instance => 'SCALAR',
1095 get_method_map => 'SCALAR',
1098 # this is ugly, but so are typeglobs,
1099 # so whattayahgonnadoboutit
1102 add_package_symbol => sub {
1103 my $original = shift;
1104 confess "Cannot add package symbols to an immutable metaclass"
1105 unless (caller(2))[3] eq 'Class::MOP::Package::get_package_symbol';
1107 # This is a workaround for a bug in 5.8.1 which thinks that
1108 # goto $original->body
1109 # is trying to go to a label
1110 my $body = $original->body;
1126 Class::MOP::Class - Class Meta Object
1130 # assuming that class Foo
1131 # has been defined, you can
1133 # use this for introspection ...
1135 # add a method to Foo ...
1136 Foo->meta->add_method('bar' => sub { ... })
1138 # get a list of all the classes searched
1139 # the method dispatcher in the correct order
1140 Foo->meta->class_precedence_list()
1142 # remove a method from Foo
1143 Foo->meta->remove_method('bar');
1145 # or use this to actually create classes ...
1147 Class::MOP::Class->create('Bar' => (
1149 superclasses => [ 'Foo' ],
1151 Class::MOP:::Attribute->new('$bar'),
1152 Class::MOP:::Attribute->new('$baz'),
1155 calculate_bar => sub { ... },
1156 construct_baz => sub { ... }
1162 This is the largest and currently most complex part of the Perl 5
1163 meta-object protocol. It controls the introspection and
1164 manipulation of Perl 5 classes (and it can create them too). The
1165 best way to understand what this module can do, is to read the
1166 documentation for each of it's methods.
1170 =head2 Self Introspection
1176 This will return a B<Class::MOP::Class> instance which is related
1177 to this class. Thereby allowing B<Class::MOP::Class> to actually
1180 As with B<Class::MOP::Attribute>, B<Class::MOP> will actually
1181 bootstrap this module by installing a number of attribute meta-objects
1182 into it's metaclass. This will allow this class to reap all the benifits
1183 of the MOP when subclassing it.
1187 =head2 Class construction
1189 These methods will handle creating B<Class::MOP::Class> objects,
1190 which can be used to both create new classes, and analyze
1191 pre-existing classes.
1193 This module will internally store references to all the instances
1194 you create with these methods, so that they do not need to be
1195 created any more than nessecary. Basically, they are singletons.
1199 =item B<create ($package_name,
1200 version =E<gt> ?$version,
1201 authority =E<gt> ?$authority,
1202 superclasses =E<gt> ?@superclasses,
1203 methods =E<gt> ?%methods,
1204 attributes =E<gt> ?%attributes)>
1206 This returns a B<Class::MOP::Class> object, bringing the specified
1207 C<$package_name> into existence and adding any of the C<$version>,
1208 C<$authority>, C<@superclasses>, C<%methods> and C<%attributes> to
1211 =item B<create_anon_class (superclasses =E<gt> ?@superclasses,
1212 methods =E<gt> ?%methods,
1213 attributes =E<gt> ?%attributes)>
1215 This will create an anonymous class, it works much like C<create> but
1216 it does not need a C<$package_name>. Instead it will create a suitably
1217 unique package name for you to stash things into.
1219 On very important distinction is that anon classes are destroyed once
1220 the metaclass they are attached to goes out of scope. In the DESTROY
1221 method, the created package will be removed from the symbol table.
1223 It is also worth noting that any instances created with an anon-class
1224 will keep a special reference to the anon-meta which will prevent the
1225 anon-class from going out of scope until all instances of it have also
1226 been destroyed. This however only works for HASH based instance types,
1227 as we use a special reserved slot (C<__MOP__>) to store this.
1229 =item B<initialize ($package_name, %options)>
1231 This initializes and returns returns a B<Class::MOP::Class> object
1232 for a given a C<$package_name>.
1234 =item B<construct_class_instance (%options)>
1236 This will construct an instance of B<Class::MOP::Class>, it is
1237 here so that we can actually "tie the knot" for B<Class::MOP::Class>
1238 to use C<construct_instance> once all the bootstrapping is done. This
1239 method is used internally by C<initialize> and should never be called
1240 from outside of that method really.
1242 =item B<check_metaclass_compatability>
1244 This method is called as the very last thing in the
1245 C<construct_class_instance> method. This will check that the
1246 metaclass you are creating is compatible with the metaclasses of all
1247 your ancestors. For more inforamtion about metaclass compatibility
1248 see the C<About Metaclass compatibility> section in L<Class::MOP>.
1250 =item B<update_package_cache_flag>
1252 This will reset the package cache flag for this particular metaclass
1253 it is basically the value of the C<Class::MOP::get_package_cache_flag>
1254 function. This is very rarely needed from outside of C<Class::MOP::Class>
1255 but in some cases you might want to use it, so it is here.
1257 =item B<reset_package_cache_flag>
1259 Clears the package cache flag to announce to the internals that we need
1260 to rebuild the method map.
1262 =item B<add_meta_instance_dependencies>
1264 Registers this class as dependent on its superclasses.
1266 Only superclasses from which this class inherits attributes will be added.
1268 =item B<remove_meta_instance_depdendencies>
1270 Unregisters this class from its superclasses.
1272 =item B<update_meta_instance_dependencies>
1274 Reregisters if necessary.
1276 =item B<add_dependent_meta_instance> $metaclass
1278 Registers the class as having a meta instance dependent on this class.
1280 =item B<remove_dependent_meta_instance> $metaclass
1282 Remove the class from the list of dependent classes.
1284 =item B<invalidate_meta_instances>
1286 Clears the cached meta instance for this metaclass and all of the registered
1287 classes with dependent meta instances.
1289 Called by C<add_attribute> and C<remove_attribute> to recalculate the attribute
1292 =item B<invalidate_meta_instance>
1294 Used by C<invalidate_meta_instances>.
1298 =head2 Object instance construction and cloning
1300 These methods are B<entirely optional>, it is up to you whether you want
1305 =item B<instance_metaclass>
1307 Returns the class name of the instance metaclass, see L<Class::MOP::Instance>
1308 for more information on the instance metaclasses.
1310 =item B<get_meta_instance>
1312 Returns an instance of L<Class::MOP::Instance> to be used in the construction
1313 of a new instance of the class.
1315 =item B<create_meta_instance>
1317 Called by C<get_meta_instance> if necessary.
1319 =item B<new_object (%params)>
1321 This is a convience method for creating a new object of the class, and
1322 blessing it into the appropriate package as well. Ideally your class
1323 would call a C<new> this method like so:
1326 my ($class, %param) = @_;
1327 $class->meta->new_object(%params);
1330 =item B<construct_instance (%params)>
1332 This method is used to construct an instance structure suitable for
1333 C<bless>-ing into your package of choice. It works in conjunction
1334 with the Attribute protocol to collect all applicable attributes.
1336 This will construct and instance using a HASH ref as storage
1337 (currently only HASH references are supported). This will collect all
1338 the applicable attributes and layout out the fields in the HASH ref,
1339 it will then initialize them using either use the corresponding key
1340 in C<%params> or any default value or initializer found in the
1341 attribute meta-object.
1343 =item B<clone_object ($instance, %params)>
1345 This is a convience method for cloning an object instance, then
1346 blessing it into the appropriate package. This method will call
1347 C<clone_instance>, which performs a shallow copy of the object,
1348 see that methods documentation for more details. Ideally your
1349 class would call a C<clone> this method like so:
1351 sub MyClass::clone {
1352 my ($self, %param) = @_;
1353 $self->meta->clone_object($self, %params);
1356 =item B<clone_instance($instance, %params)>
1358 This method is a compliment of C<construct_instance> (which means if
1359 you override C<construct_instance>, you need to override this one too),
1360 and clones the instance shallowly.
1362 The cloned structure returned is (like with C<construct_instance>) an
1363 unC<bless>ed HASH reference, it is your responsibility to then bless
1364 this cloned structure into the right class (which C<clone_object> will
1367 As of 0.11, this method will clone the C<$instance> structure shallowly,
1368 as opposed to the deep cloning implemented in prior versions. After much
1369 thought, research and discussion, I have decided that anything but basic
1370 shallow cloning is outside the scope of the meta-object protocol. I
1371 think Yuval "nothingmuch" Kogman put it best when he said that cloning
1372 is too I<context-specific> to be part of the MOP.
1374 =item B<rebless_instance($instance, ?%params)>
1376 This will change the class of C<$instance> to the class of the invoking
1377 C<Class::MOP::Class>. You may only rebless the instance to a subclass of
1378 itself. You may pass in optional C<%params> which are like constructor
1379 params and will override anything already defined in the instance.
1383 =head2 Informational
1385 These are a few predicate methods for asking information about the class.
1389 =item B<is_anon_class>
1391 This returns true if the class is a C<Class::MOP::Class> created anon class.
1395 This returns true if the class is still mutable.
1397 =item B<is_immutable>
1399 This returns true if the class has been made immutable.
1401 =item B<is_pristine>
1403 Checks whether the class has any data that will be lost if C<reinitialize> is
1408 =head2 Inheritance Relationships
1412 =item B<superclasses (?@superclasses)>
1414 This is a read-write attribute which represents the superclass
1415 relationships of the class the B<Class::MOP::Class> instance is
1416 associated with. Basically, it can get and set the C<@ISA> for you.
1418 =item B<class_precedence_list>
1420 This computes the a list of all the class's ancestors in the same order
1421 in which method dispatch will be done. This is similair to what
1422 B<Class::ISA::super_path> does, but we don't remove duplicate names.
1424 =item B<linearized_isa>
1426 This returns a list based on C<class_precedence_list> but with all
1431 This returns a list of subclasses for this class.
1439 =item B<get_method_map>
1441 Returns a HASH ref of name to CODE reference mapping for this class.
1443 =item B<method_metaclass>
1445 Returns the class name of the method metaclass, see L<Class::MOP::Method>
1446 for more information on the method metaclasses.
1448 =item B<wrap_method_body(%attrs)>
1450 Wrap a code ref (C<$attrs{body>) with C<method_metaclass>.
1452 =item B<add_method ($method_name, $method, %attrs)>
1454 This will take a C<$method_name> and CODE reference or meta method
1455 objectand install it into the class's package.
1457 You are strongly encouraged to pass a meta method object instead of a
1458 code reference. If you do so, that object gets stored as part of the
1459 class's method map, providing more useful information about the method
1463 This does absolutely nothing special to C<$method>
1464 other than use B<Sub::Name> to make sure it is tagged with the
1465 correct name, and therefore show up correctly in stack traces and
1468 =item B<has_method ($method_name)>
1470 This just provides a simple way to check if the class implements
1471 a specific C<$method_name>. It will I<not> however, attempt to check
1472 if the class inherits the method (use C<UNIVERSAL::can> for that).
1474 This will correctly handle functions defined outside of the package
1475 that use a fully qualified name (C<sub Package::name { ... }>).
1477 This will correctly handle functions renamed with B<Sub::Name> and
1478 installed using the symbol tables. However, if you are naming the
1479 subroutine outside of the package scope, you must use the fully
1480 qualified name, including the package name, for C<has_method> to
1481 correctly identify it.
1483 This will attempt to correctly ignore functions imported from other
1484 packages using B<Exporter>. It breaks down if the function imported
1485 is an C<__ANON__> sub (such as with C<use constant>), which very well
1486 may be a valid method being applied to the class.
1488 In short, this method cannot always be trusted to determine if the
1489 C<$method_name> is actually a method. However, it will DWIM about
1490 90% of the time, so it's a small trade off I think.
1492 =item B<get_method ($method_name)>
1494 This will return a Class::MOP::Method instance related to the specified
1495 C<$method_name>, or return undef if that method does not exist.
1497 The Class::MOP::Method is codifiable, so you can use it like a normal
1498 CODE reference, see L<Class::MOP::Method> for more information.
1500 =item B<find_method_by_name ($method_name)>
1502 This will return a CODE reference of the specified C<$method_name>,
1503 or return undef if that method does not exist.
1505 Unlike C<get_method> this will also look in the superclasses.
1507 =item B<remove_method ($method_name)>
1509 This will attempt to remove a given C<$method_name> from the class.
1510 It will return the CODE reference that it has removed, and will
1511 attempt to use B<Sub::Name> to clear the methods associated name.
1513 =item B<get_method_list>
1515 This will return a list of method names for all I<locally> defined
1516 methods. It does B<not> provide a list of all applicable methods,
1517 including any inherited ones. If you want a list of all applicable
1518 methods, use the C<compute_all_applicable_methods> method.
1520 =item B<get_all_methods>
1522 This will traverse the inheritance heirachy and return a list of all
1523 the applicable L<Class::MOP::Method> objects for this class.
1525 =item B<compute_all_applicable_methods>
1529 This method returns a list of hashes describing the all the methods of the
1532 Use L<get_all_methods>, which is easier/better/faster. This method predates
1533 L<Class::MOP::Method>.
1535 =item B<find_all_methods_by_name ($method_name)>
1537 This will traverse the inheritence hierarchy and locate all methods
1538 with a given C<$method_name>. Similar to
1539 C<compute_all_applicable_methods> it returns a list of HASH references
1540 with the following information; method name (which will always be the
1541 same as C<$method_name>), the name of the class in which the method
1542 lives and a CODE reference for the actual method.
1544 The list of methods produced is a distinct list, meaning there are no
1545 duplicates in it. This is especially useful for things like object
1546 initialization and destruction where you only want the method called
1547 once, and in the correct order.
1549 =item B<find_next_method_by_name ($method_name)>
1551 This will return the first method to match a given C<$method_name> in
1552 the superclasses, this is basically equivalent to calling
1553 C<SUPER::$method_name>, but it can be dispatched at runtime.
1555 =item B<alias_method ($method_name, $method)>
1557 B<NOTE>: This method is now deprecated. Just use C<add_method>
1562 =head2 Method Modifiers
1564 Method modifiers are a concept borrowed from CLOS, in which a method
1565 can be wrapped with I<before>, I<after> and I<around> method modifiers
1566 that will be called everytime the method is called.
1568 =head3 How method modifiers work?
1570 Method modifiers work by wrapping the original method and then replacing
1571 it in the classes symbol table. The wrappers will handle calling all the
1572 modifiers in the appropariate orders and preserving the calling context
1573 for the original method.
1575 Each method modifier serves a particular purpose, which may not be
1576 obvious to users of other method wrapping modules. To start with, the
1577 return values of I<before> and I<after> modifiers are ignored. This is
1578 because thier purpose is B<not> to filter the input and output of the
1579 primary method (this is done with an I<around> modifier). This may seem
1580 like an odd restriction to some, but doing this allows for simple code
1581 to be added at the begining or end of a method call without jeapordizing
1582 the normal functioning of the primary method or placing any extra
1583 responsibility on the code of the modifier. Of course if you have more
1584 complex needs, then use the I<around> modifier, which uses a variation
1585 of continutation passing style to allow for a high degree of flexibility.
1587 Before and around modifiers are called in last-defined-first-called order,
1588 while after modifiers are called in first-defined-first-called order. So
1589 the call tree might looks something like this:
1599 To see examples of using method modifiers, see the following examples
1600 included in the distribution; F<InstanceCountingClass>, F<Perl6Attribute>,
1601 F<AttributesWithHistory> and F<C3MethodDispatchOrder>. There is also a
1602 classic CLOS usage example in the test F<017_add_method_modifier.t>.
1604 =head3 What is the performance impact?
1606 Of course there is a performance cost associated with method modifiers,
1607 but we have made every effort to make that cost be directly proportional
1608 to the amount of modifier features you utilize.
1610 The wrapping method does it's best to B<only> do as much work as it
1611 absolutely needs to. In order to do this we have moved some of the
1612 performance costs to set-up time, where they are easier to amortize.
1614 All this said, my benchmarks have indicated the following:
1616 simple wrapper with no modifiers 100% slower
1617 simple wrapper with simple before modifier 400% slower
1618 simple wrapper with simple after modifier 450% slower
1619 simple wrapper with simple around modifier 500-550% slower
1620 simple wrapper with all 3 modifiers 1100% slower
1622 These numbers may seem daunting, but you must remember, every feature
1623 comes with some cost. To put things in perspective, just doing a simple
1624 C<AUTOLOAD> which does nothing but extract the name of the method called
1625 and return it costs about 400% over a normal method call.
1629 =item B<add_before_method_modifier ($method_name, $code)>
1631 This will wrap the method at C<$method_name> and the supplied C<$code>
1632 will be passed the C<@_> arguments, and called before the original
1633 method is called. As specified above, the return value of the I<before>
1634 method modifiers is ignored, and it's ability to modify C<@_> is
1635 fairly limited. If you need to do either of these things, use an
1636 C<around> method modifier.
1638 =item B<add_after_method_modifier ($method_name, $code)>
1640 This will wrap the method at C<$method_name> so that the original
1641 method will be called, it's return values stashed, and then the
1642 supplied C<$code> will be passed the C<@_> arguments, and called.
1643 As specified above, the return value of the I<after> method
1644 modifiers is ignored, and it cannot modify the return values of
1645 the original method. If you need to do either of these things, use an
1646 C<around> method modifier.
1648 =item B<add_around_method_modifier ($method_name, $code)>
1650 This will wrap the method at C<$method_name> so that C<$code>
1651 will be called and passed the original method as an extra argument
1652 at the begining of the C<@_> argument list. This is a variation of
1653 continuation passing style, where the function prepended to C<@_>
1654 can be considered a continuation. It is up to C<$code> if it calls
1655 the original method or not, there is no restriction on what the
1656 C<$code> can or cannot do.
1662 It should be noted that since there is no one consistent way to define
1663 the attributes of a class in Perl 5. These methods can only work with
1664 the information given, and can not easily discover information on
1665 their own. See L<Class::MOP::Attribute> for more details.
1669 =item B<attribute_metaclass>
1671 Returns the class name of the attribute metaclass, see L<Class::MOP::Attribute>
1672 for more information on the attribute metaclasses.
1674 =item B<get_attribute_map>
1676 This returns a HASH ref of name to attribute meta-object mapping.
1678 =item B<add_attribute ($attribute_meta_object | ($attribute_name, %attribute_spec))>
1680 This stores the C<$attribute_meta_object> (or creates one from the
1681 C<$attribute_name> and C<%attribute_spec>) in the B<Class::MOP::Class>
1682 instance associated with the given class. Unlike methods, attributes
1683 within the MOP are stored as meta-information only. They will be used
1684 later to construct instances from (see C<construct_instance> above).
1685 More details about the attribute meta-objects can be found in the
1686 L<Class::MOP::Attribute> or the L<Class::MOP/The Attribute protocol>
1689 It should be noted that any accessor, reader/writer or predicate
1690 methods which the C<$attribute_meta_object> has will be installed
1691 into the class at this time.
1694 If an attribute already exists for C<$attribute_name>, the old one
1695 will be removed (as well as removing all it's accessors), and then
1698 =item B<has_attribute ($attribute_name)>
1700 Checks to see if this class has an attribute by the name of
1701 C<$attribute_name> and returns a boolean.
1703 =item B<get_attribute ($attribute_name)>
1705 Returns the attribute meta-object associated with C<$attribute_name>,
1706 if none is found, it will return undef.
1708 =item B<remove_attribute ($attribute_name)>
1710 This will remove the attribute meta-object stored at
1711 C<$attribute_name>, then return the removed attribute meta-object.
1714 Removing an attribute will only affect future instances of
1715 the class, it will not make any attempt to remove the attribute from
1716 any existing instances of the class.
1718 It should be noted that any accessor, reader/writer or predicate
1719 methods which the attribute meta-object stored at C<$attribute_name>
1720 has will be removed from the class at this time. This B<will> make
1721 these attributes somewhat inaccessable in previously created
1722 instances. But if you are crazy enough to do this at runtime, then
1723 you are crazy enough to deal with something like this :).
1725 =item B<get_attribute_list>
1727 This returns a list of attribute names which are defined in the local
1728 class. If you want a list of all applicable attributes for a class,
1729 use the C<compute_all_applicable_attributes> method.
1731 =item B<compute_all_applicable_attributes>
1733 =item B<get_all_attributes>
1735 This will traverse the inheritance heirachy and return a list of all
1736 the applicable L<Class::MOP::Attribute> objects for this class.
1738 C<get_all_attributes> is an alias for consistency with C<get_all_methods>.
1740 =item B<find_attribute_by_name ($attr_name)>
1742 This method will traverse the inheritance heirachy and find the
1743 first attribute whose name matches C<$attr_name>, then return it.
1744 It will return undef if nothing is found.
1748 =head2 Class Immutability
1752 =item B<make_immutable (%options)>
1754 This method will invoke a tranforamtion upon the class which will
1755 make it immutable. Details of this transformation can be found in
1756 the L<Class::MOP::Immutable> documentation.
1758 =item B<make_mutable>
1760 This method will reverse tranforamtion upon the class which
1763 =item B<get_immutable_transformer>
1765 Return a transformer suitable for making this class immutable or, if this
1766 class is immutable, the transformer used to make it immutable.
1768 =item B<get_immutable_options>
1770 If the class is immutable, return the options used to make it immutable.
1772 =item B<create_immutable_transformer>
1774 Create a transformer suitable for making this class immutable
1780 Stevan Little E<lt>stevan@iinteractive.comE<gt>
1782 =head1 COPYRIGHT AND LICENSE
1784 Copyright 2006-2008 by Infinity Interactive, Inc.
1786 L<http://www.iinteractive.com>
1788 This library is free software; you can redistribute it and/or modify
1789 it under the same terms as Perl itself.