use strict;
use warnings;
+use Class::MOP::Immutable;
+use Class::MOP::Instance;
+use Class::MOP::Method::Wrapped;
+
use Carp 'confess';
-use Scalar::Util 'blessed', 'reftype';
-use Sub::Name 'subname';
-use B 'svref_2object';
+use Scalar::Util 'blessed', 'weaken';
+
+our $VERSION = '0.78';
+$VERSION = eval $VERSION;
+our $AUTHORITY = 'cpan:STEVAN';
-our $VERSION = '0.01';
+use base 'Class::MOP::Module';
# Creation
-{
- # Metaclasses are singletons, so we cache them here.
- # there is no need to worry about destruction though
- # because they should die only when the program dies.
- # After all, do package definitions even get reaped?
- my %METAS;
- sub initialize {
- my ($class, $package_name) = @_;
- (defined $package_name && $package_name)
- || confess "You must pass a package name";
- $METAS{$package_name} ||= bless \$package_name => blessed($class) || $class;
+sub initialize {
+ my $class = shift;
+
+ my $package_name;
+
+ if ( @_ % 2 ) {
+ $package_name = shift;
+ } else {
+ my %options = @_;
+ $package_name = $options{package};
}
+
+ (defined $package_name && $package_name && !ref($package_name))
+ || confess "You must pass a package name and it cannot be blessed";
+
+ return Class::MOP::get_metaclass_by_name($package_name)
+ || $class->construct_class_instance(package => $package_name, @_);
}
-sub create {
- my ($class, $package_name, $package_version, %options) = @_;
+# NOTE: (meta-circularity)
+# this is a special form of &construct_instance
+# (see below), which is used to construct class
+# meta-object instances for any Class::MOP::*
+# class. All other classes will use the more
+# normal &construct_instance.
+sub construct_class_instance {
+ my $class = shift;
+ my $options = @_ == 1 ? $_[0] : {@_};
+ my $package_name = $options->{package};
(defined $package_name && $package_name)
|| confess "You must pass a package name";
- my $code = "package $package_name;";
- $code .= "\$$package_name\:\:VERSION = '$package_version';"
- if defined $package_version;
- eval $code;
- confess "creation of $package_name failed : $@" if $@;
- my $meta = $class->initialize($package_name);
+ # NOTE:
+ # return the metaclass if we have it cached,
+ # and it is still defined (it has not been
+ # reaped by DESTROY yet, which can happen
+ # annoyingly enough during global destruction)
+
+ if (defined(my $meta = Class::MOP::get_metaclass_by_name($package_name))) {
+ return $meta;
+ }
+
+ # NOTE:
+ # we need to deal with the possibility
+ # of class immutability here, and then
+ # get the name of the class appropriately
+ $class = (ref($class)
+ ? ($class->is_immutable
+ ? $class->get_mutable_metaclass_name()
+ : ref($class))
+ : $class);
+
+ # now create the metaclass
+ my $meta;
+ if ($class eq 'Class::MOP::Class') {
+ $meta = $class->_new($options);
+ }
+ else {
+ # NOTE:
+ # it is safe to use meta here because
+ # class will always be a subclass of
+ # Class::MOP::Class, which defines meta
+ $meta = $class->meta->construct_instance($options)
+ }
+
+ # and check the metaclass compatibility
+ $meta->check_metaclass_compatibility();
+
+ Class::MOP::store_metaclass_by_name($package_name, $meta);
+
+ # NOTE:
+ # we need to weaken any anon classes
+ # so that they can call DESTROY properly
+ Class::MOP::weaken_metaclass($package_name) if $meta->is_anon_class;
+
+ $meta;
+}
+
+sub _new {
+ my $class = shift;
+ my $options = @_ == 1 ? $_[0] : {@_};
+
+ bless {
+ # inherited from Class::MOP::Package
+ 'package' => $options->{package},
+
+ # NOTE:
+ # since the following attributes will
+ # actually be loaded from the symbol
+ # table, and actually bypass the instance
+ # entirely, we can just leave these things
+ # listed here for reference, because they
+ # should not actually have a value associated
+ # with the slot.
+ 'namespace' => \undef,
+
+ # inherited from Class::MOP::Module
+ 'version' => \undef,
+ 'authority' => \undef,
+
+ # defined in Class::MOP::Class
+ 'superclasses' => \undef,
+
+ 'methods' => {},
+ 'attributes' => {},
+ 'attribute_metaclass' => $options->{'attribute_metaclass'}
+ || 'Class::MOP::Attribute',
+ 'method_metaclass' => $options->{'method_metaclass'}
+ || 'Class::MOP::Method',
+ 'wrapped_method_metaclass' => $options->{'wrapped_method_metaclass'}
+ || 'Class::MOP::Method::Wrapped',
+ 'instance_metaclass' => $options->{'instance_metaclass'}
+ || 'Class::MOP::Instance',
+ }, $class;
+}
+
+sub reset_package_cache_flag { (shift)->{'_package_cache_flag'} = undef }
+sub update_package_cache_flag {
+ my $self = shift;
+ # NOTE:
+ # we can manually update the cache number
+ # since we are actually adding the method
+ # to our cache as well. This avoids us
+ # having to regenerate the method_map.
+ # - SL
+ $self->{'_package_cache_flag'} = Class::MOP::check_package_cache_flag($self->name);
+}
+
+sub check_metaclass_compatibility {
+ my $self = shift;
+
+ # this is always okay ...
+ return if ref($self) eq 'Class::MOP::Class' &&
+ $self->instance_metaclass eq 'Class::MOP::Instance';
+
+ my @class_list = $self->linearized_isa;
+ shift @class_list; # shift off $self->name
+
+ foreach my $superclass_name (@class_list) {
+ my $super_meta = Class::MOP::get_metaclass_by_name($superclass_name) || next;
+
+ # NOTE:
+ # we need to deal with the possibility
+ # of class immutability here, and then
+ # get the name of the class appropriately
+ my $super_meta_type
+ = $super_meta->is_immutable
+ ? $super_meta->get_mutable_metaclass_name()
+ : ref($super_meta);
+
+ ($self->isa($super_meta_type))
+ || confess $self->name . "->meta => (" . (ref($self)) . ")" .
+ " is not compatible with the " .
+ $superclass_name . "->meta => (" . ($super_meta_type) . ")";
+ # NOTE:
+ # we also need to check that instance metaclasses
+ # are compatibile in the same the class.
+ ($self->instance_metaclass->isa($super_meta->instance_metaclass))
+ || confess $self->name . "->meta->instance_metaclass => (" . ($self->instance_metaclass) . ")" .
+ " is not compatible with the " .
+ $superclass_name . "->meta->instance_metaclass => (" . ($super_meta->instance_metaclass) . ")";
+ }
+}
+
+## ANON classes
+
+{
+ # NOTE:
+ # this should be sufficient, if you have a
+ # use case where it is not, write a test and
+ # I will change it.
+ my $ANON_CLASS_SERIAL = 0;
+
+ # NOTE:
+ # we need a sufficiently annoying prefix
+ # this should suffice for now, this is
+ # used in a couple of places below, so
+ # need to put it up here for now.
+ my $ANON_CLASS_PREFIX = 'Class::MOP::Class::__ANON__::SERIAL::';
+
+ sub is_anon_class {
+ my $self = shift;
+ no warnings 'uninitialized';
+ $self->name =~ /^$ANON_CLASS_PREFIX/;
+ }
+
+ sub create_anon_class {
+ my ($class, %options) = @_;
+ my $package_name = $ANON_CLASS_PREFIX . ++$ANON_CLASS_SERIAL;
+ return $class->create($package_name, %options);
+ }
+
+ # NOTE:
+ # this will only get called for
+ # anon-classes, all other calls
+ # are assumed to occur during
+ # global destruction and so don't
+ # really need to be handled explicitly
+ sub DESTROY {
+ my $self = shift;
+
+ return if Class::MOP::in_global_destruction(); # it'll happen soon anyway and this just makes things more complicated
+
+ no warnings 'uninitialized';
+ return unless $self->name =~ /^$ANON_CLASS_PREFIX/;
+ # Moose does a weird thing where it replaces the metaclass for
+ # class when fixing metaclass incompatibility. In that case,
+ # we don't want to clean out the namespace now. We can detect
+ # that because Moose will explicitly update the singleton
+ # cache in Class::MOP.
+ my $current_meta = Class::MOP::get_metaclass_by_name($self->name);
+ return if $current_meta ne $self;
+
+ my ($serial_id) = ($self->name =~ /^$ANON_CLASS_PREFIX(\d+)/);
+ no strict 'refs';
+ foreach my $key (keys %{$ANON_CLASS_PREFIX . $serial_id}) {
+ delete ${$ANON_CLASS_PREFIX . $serial_id}{$key};
+ }
+ delete ${'main::' . $ANON_CLASS_PREFIX}{$serial_id . '::'};
+ }
+
+}
+
+# creating classes with MOP ...
+
+sub create {
+ my ( $class, @args ) = @_;
+
+ unshift @args, 'package' if @args % 2 == 1;
+
+ my (%options) = @args;
+ my $package_name = $options{package};
+
+ (ref $options{superclasses} eq 'ARRAY')
+ || confess "You must pass an ARRAY ref of superclasses"
+ if exists $options{superclasses};
+
+ (ref $options{attributes} eq 'ARRAY')
+ || confess "You must pass an ARRAY ref of attributes"
+ if exists $options{attributes};
+
+ (ref $options{methods} eq 'HASH')
+ || confess "You must pass a HASH ref of methods"
+ if exists $options{methods};
+
+ $class->SUPER::create(%options);
+
+ my (%initialize_options) = @args;
+ delete @initialize_options{qw(
+ package
+ superclasses
+ attributes
+ methods
+ version
+ authority
+ )};
+ my $meta = $class->initialize( $package_name => %initialize_options );
+
+ # FIXME totally lame
+ $meta->add_method('meta' => sub {
+ $class->initialize(ref($_[0]) || $_[0]);
+ });
+
$meta->superclasses(@{$options{superclasses}})
if exists $options{superclasses};
+ # NOTE:
+ # process attributes first, so that they can
+ # install accessors, but locally defined methods
+ # can then overwrite them. It is maybe a little odd, but
+ # I think this should be the order of things.
+ if (exists $options{attributes}) {
+ foreach my $attr (@{$options{attributes}}) {
+ $meta->add_attribute($attr);
+ }
+ }
if (exists $options{methods}) {
foreach my $method_name (keys %{$options{methods}}) {
$meta->add_method($method_name, $options{methods}->{$method_name});
return $meta;
}
-# Informational
+## Attribute readers
-sub name { ${$_[0]} }
+# NOTE:
+# all these attribute readers will be bootstrapped
+# away in the Class::MOP bootstrap section
-sub version {
+sub get_attribute_map { $_[0]->{'attributes'} }
+sub attribute_metaclass { $_[0]->{'attribute_metaclass'} }
+sub method_metaclass { $_[0]->{'method_metaclass'} }
+sub wrapped_method_metaclass { $_[0]->{'wrapped_method_metaclass'} }
+sub instance_metaclass { $_[0]->{'instance_metaclass'} }
+
+# Instance Construction & Cloning
+
+sub new_object {
+ my $class = shift;
+
+ # NOTE:
+ # we need to protect the integrity of the
+ # Class::MOP::Class singletons here, so we
+ # delegate this to &construct_class_instance
+ # which will deal with the singletons
+ return $class->construct_class_instance(@_)
+ if $class->name->isa('Class::MOP::Class');
+ return $class->construct_instance(@_);
+}
+
+sub construct_instance {
+ my $class = shift;
+ my $params = @_ == 1 ? $_[0] : {@_};
+ my $meta_instance = $class->get_meta_instance();
+ my $instance = $meta_instance->create_instance();
+ foreach my $attr ($class->compute_all_applicable_attributes()) {
+ $attr->initialize_instance_slot($meta_instance, $instance, $params);
+ }
+ # NOTE:
+ # this will only work for a HASH instance type
+ if ($class->is_anon_class) {
+ (Scalar::Util::reftype($instance) eq 'HASH')
+ || confess "Currently only HASH based instances are supported with instance of anon-classes";
+ # NOTE:
+ # At some point we should make this official
+ # as a reserved slot name, but right now I am
+ # going to keep it here.
+ # my $RESERVED_MOP_SLOT = '__MOP__';
+ $instance->{'__MOP__'} = $class;
+ }
+ return $instance;
+}
+
+
+sub get_meta_instance {
my $self = shift;
- no strict 'refs';
- ${$self->name . '::VERSION'};
+ $self->{'_meta_instance'} ||= $self->create_meta_instance();
+}
+
+sub create_meta_instance {
+ my $self = shift;
+
+ my $instance = $self->instance_metaclass->new(
+ associated_metaclass => $self,
+ attributes => [ $self->compute_all_applicable_attributes() ],
+ );
+
+ $self->add_meta_instance_dependencies()
+ if $instance->is_dependent_on_superclasses();
+
+ return $instance;
+}
+
+sub clone_object {
+ my $class = shift;
+ my $instance = shift;
+ (blessed($instance) && $instance->isa($class->name))
+ || confess "You must pass an instance of the metaclass (" . (ref $class ? $class->name : $class) . "), not ($instance)";
+
+ # NOTE:
+ # we need to protect the integrity of the
+ # Class::MOP::Class singletons here, they
+ # should not be cloned.
+ return $instance if $instance->isa('Class::MOP::Class');
+ $class->clone_instance($instance, @_);
+}
+
+sub clone_instance {
+ my ($class, $instance, %params) = @_;
+ (blessed($instance))
+ || confess "You can only clone instances, ($instance) is not a blessed instance";
+ my $meta_instance = $class->get_meta_instance();
+ my $clone = $meta_instance->clone_instance($instance);
+ foreach my $attr ($class->compute_all_applicable_attributes()) {
+ if ( defined( my $init_arg = $attr->init_arg ) ) {
+ if (exists $params{$init_arg}) {
+ $attr->set_value($clone, $params{$init_arg});
+ }
+ }
+ }
+ return $clone;
+}
+
+sub rebless_instance {
+ my ($self, $instance, %params) = @_;
+
+ my $old_metaclass;
+ if ($instance->can('meta')) {
+ ($instance->meta->isa('Class::MOP::Class'))
+ || confess 'Cannot rebless instance if ->meta is not an instance of Class::MOP::Class';
+ $old_metaclass = $instance->meta;
+ }
+ else {
+ $old_metaclass = $self->initialize(ref($instance));
+ }
+
+ my $meta_instance = $self->get_meta_instance();
+
+ $self->name->isa($old_metaclass->name)
+ || confess "You may rebless only into a subclass of (". $old_metaclass->name ."), of which (". $self->name .") isn't.";
+
+ # rebless!
+ # we use $_[1] here because of t/306_rebless_overload.t regressions on 5.8.8
+ $meta_instance->rebless_instance_structure($_[1], $self);
+
+ foreach my $attr ( $self->compute_all_applicable_attributes ) {
+ if ( $attr->has_value($instance) ) {
+ if ( defined( my $init_arg = $attr->init_arg ) ) {
+ $params{$init_arg} = $attr->get_value($instance)
+ unless exists $params{$init_arg};
+ }
+ else {
+ $attr->set_value($instance, $attr->get_value($instance));
+ }
+ }
+ }
+
+ foreach my $attr ($self->compute_all_applicable_attributes) {
+ $attr->initialize_instance_slot($meta_instance, $instance, \%params);
+ }
+
+ $instance;
}
# Inheritance
sub superclasses {
- my $self = shift;
- no strict 'refs';
+ my $self = shift;
+ my $var_spec = { sigil => '@', type => 'ARRAY', name => 'ISA' };
if (@_) {
my @supers = @_;
- @{$self->name . '::ISA'} = @supers;
+ @{$self->get_package_symbol($var_spec)} = @supers;
+
+ # NOTE:
+ # on 5.8 and below, we need to call
+ # a method to get Perl to detect
+ # a cycle in the class hierarchy
+ my $class = $self->name;
+ $class->isa($class);
+
+ # NOTE:
+ # we need to check the metaclass
+ # compatibility here so that we can
+ # be sure that the superclass is
+ # not potentially creating an issues
+ # we don't know about
+
+ $self->check_metaclass_compatibility();
+ $self->update_meta_instance_dependencies();
+ }
+ @{$self->get_package_symbol($var_spec)};
+}
+
+sub subclasses {
+ my $self = shift;
+
+ my $super_class = $self->name;
+
+ if ( Class::MOP::HAVE_ISAREV() ) {
+ return @{ $super_class->mro::get_isarev() };
+ } else {
+ my @derived_classes;
+
+ my $find_derived_classes;
+ $find_derived_classes = sub {
+ my ($outer_class) = @_;
+
+ my $symbol_table_hashref = do { no strict 'refs'; \%{"${outer_class}::"} };
+
+ SYMBOL:
+ for my $symbol ( keys %$symbol_table_hashref ) {
+ next SYMBOL if $symbol !~ /\A (\w+):: \z/x;
+ my $inner_class = $1;
+
+ next SYMBOL if $inner_class eq 'SUPER'; # skip '*::SUPER'
+
+ my $class =
+ $outer_class
+ ? "${outer_class}::$inner_class"
+ : $inner_class;
+
+ if ( $class->isa($super_class) and $class ne $super_class ) {
+ push @derived_classes, $class;
+ }
+
+ next SYMBOL if $class eq 'main'; # skip 'main::*'
+
+ $find_derived_classes->($class);
+ }
+ };
+
+ my $root_class = q{};
+ $find_derived_classes->($root_class);
+
+ undef $find_derived_classes;
+
+ @derived_classes = sort { $a->isa($b) ? 1 : $b->isa($a) ? -1 : 0 } @derived_classes;
+
+ return @derived_classes;
}
- @{$self->name . '::ISA'};
+}
+
+
+sub linearized_isa {
+ return @{ mro::get_linear_isa( (shift)->name ) };
}
sub class_precedence_list {
my $self = shift;
- # NOTE:
- # We need to check for ciruclar inheirtance here.
- # This will do nothing if all is well, and blow
- # up otherwise. Yes, it's an ugly hack, better
- # suggestions are welcome.
- { $self->name->isa('This is a test for circular inheritance') }
- # ... and no back to our regularly scheduled program
- (
- $self->name,
- map {
- $self->initialize($_)->class_precedence_list()
- } $self->superclasses()
- );
+ my $name = $self->name;
+
+ unless (Class::MOP::IS_RUNNING_ON_5_10()) {
+ # NOTE:
+ # We need to check for circular inheritance here
+ # if we are are not on 5.10, cause 5.8 detects it
+ # late. This will do nothing if all is well, and
+ # blow up otherwise. Yes, it's an ugly hack, better
+ # suggestions are welcome.
+ # - SL
+ ($name || return)->isa('This is a test for circular inheritance')
+ }
+
+ # if our mro is c3, we can
+ # just grab the linear_isa
+ if (mro::get_mro($name) eq 'c3') {
+ return @{ mro::get_linear_isa($name) }
+ }
+ else {
+ # NOTE:
+ # we can't grab the linear_isa for dfs
+ # since it has all the duplicates
+ # already removed.
+ return (
+ $name,
+ map {
+ $self->initialize($_)->class_precedence_list()
+ } $self->superclasses()
+ );
+ }
}
## Methods
+sub wrap_method_body {
+ my ( $self, %args ) = @_;
+
+ ('CODE' eq ref $args{body})
+ || confess "Your code block must be a CODE reference";
+
+ $self->method_metaclass->wrap(
+ package_name => $self->name,
+ %args,
+ );
+}
+
sub add_method {
my ($self, $method_name, $method) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name";
- (reftype($method) && reftype($method) eq 'CODE')
- || confess "Your code block must be a CODE reference";
+
+ my $body;
+ if (blessed($method)) {
+ $body = $method->body;
+ if ($method->package_name ne $self->name) {
+ $method = $method->clone(
+ package_name => $self->name,
+ name => $method_name
+ ) if $method->can('clone');
+ }
+ }
+ else {
+ $body = $method;
+ $method = $self->wrap_method_body( body => $body, name => $method_name );
+ }
+
+ $method->attach_to_class($self);
+
+ # This used to call get_method_map, which meant we would build all
+ # the method objects for the class just because we added one
+ # method. This is hackier, but quicker too.
+ $self->{methods}{$method_name} = $method;
+
my $full_method_name = ($self->name . '::' . $method_name);
-
- no strict 'refs';
- *{$full_method_name} = subname $full_method_name => $method;
+ $self->add_package_symbol(
+ { sigil => '&', type => 'CODE', name => $method_name },
+ Class::MOP::subname($full_method_name => $body)
+ );
}
{
+ my $fetch_and_prepare_method = sub {
+ my ($self, $method_name) = @_;
+ my $wrapped_metaclass = $self->wrapped_method_metaclass;
+ # fetch it locally
+ my $method = $self->get_method($method_name);
+ # if we dont have local ...
+ unless ($method) {
+ # try to find the next method
+ $method = $self->find_next_method_by_name($method_name);
+ # die if it does not exist
+ (defined $method)
+ || confess "The method '$method_name' was not found in the inheritance hierarchy for " . $self->name;
+ # and now make sure to wrap it
+ # even if it is already wrapped
+ # because we need a new sub ref
+ $method = $wrapped_metaclass->wrap($method);
+ }
+ else {
+ # now make sure we wrap it properly
+ $method = $wrapped_metaclass->wrap($method)
+ unless $method->isa($wrapped_metaclass);
+ }
+ $self->add_method($method_name => $method);
+ return $method;
+ };
- ## private utility functions for has_method
- my $_find_subroutine_package_name = sub { eval { svref_2object($_[0])->GV->STASH->NAME } };
- my $_find_subroutine_name = sub { eval { svref_2object($_[0])->GV->NAME } };
+ sub add_before_method_modifier {
+ my ($self, $method_name, $method_modifier) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must pass in a method name";
+ my $method = $fetch_and_prepare_method->($self, $method_name);
+ $method->add_before_modifier(
+ Class::MOP::subname(':before' => $method_modifier)
+ );
+ }
- sub has_method {
- my ($self, $method_name, $method) = @_;
+ sub add_after_method_modifier {
+ my ($self, $method_name, $method_modifier) = @_;
(defined $method_name && $method_name)
- || confess "You must define a method name";
-
- my $sub_name = ($self->name . '::' . $method_name);
-
- no strict 'refs';
- return 0 if !defined(&{$sub_name});
- return 0 if $_find_subroutine_package_name->(\&{$sub_name}) ne $self->name &&
- $_find_subroutine_name->(\&{$sub_name}) ne '__ANON__';
- return 1;
+ || confess "You must pass in a method name";
+ my $method = $fetch_and_prepare_method->($self, $method_name);
+ $method->add_after_modifier(
+ Class::MOP::subname(':after' => $method_modifier)
+ );
}
+ sub add_around_method_modifier {
+ my ($self, $method_name, $method_modifier) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must pass in a method name";
+ my $method = $fetch_and_prepare_method->($self, $method_name);
+ $method->add_around_modifier(
+ Class::MOP::subname(':around' => $method_modifier)
+ );
+ }
+
+ # NOTE:
+ # the methods above used to be named like this:
+ # ${pkg}::${method}:(before|after|around)
+ # but this proved problematic when using one modifier
+ # to wrap multiple methods (something which is likely
+ # to happen pretty regularly IMO). So instead of naming
+ # it like this, I have chosen to just name them purely
+ # with their modifier names, like so:
+ # :(before|after|around)
+ # The fact is that in a stack trace, it will be fairly
+ # evident from the context what method they are attached
+ # to, and so don't need the fully qualified name.
+}
+
+sub alias_method {
+ my $self = shift;
+
+ $self->add_method(@_);
+}
+
+sub has_method {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name";
+
+ exists $self->{methods}{$method_name} || exists $self->get_method_map->{$method_name};
}
sub get_method {
- my ($self, $method_name, $method) = @_;
+ my ($self, $method_name) = @_;
(defined $method_name && $method_name)
|| confess "You must define a method name";
- no strict 'refs';
- return \&{$self->name . '::' . $method_name}
- if $self->has_method($method_name);
- return; # <--- make sure to return undef
+ return $self->{methods}{$method_name} || $self->get_method_map->{$method_name};
+}
+
+sub remove_method {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name";
+
+ my $removed_method = delete $self->get_method_map->{$method_name};
+
+ $self->remove_package_symbol(
+ { sigil => '&', type => 'CODE', name => $method_name }
+ );
+
+ $removed_method->detach_from_class if $removed_method;
+
+ $self->update_package_cache_flag; # still valid, since we just removed the method from the map
+
+ return $removed_method;
+}
+
+sub get_method_list {
+ my $self = shift;
+ keys %{$self->get_method_map};
+}
+
+sub find_method_by_name {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name to find";
+ foreach my $class ($self->linearized_isa) {
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ return $meta->get_method($method_name)
+ if $meta->has_method($method_name);
+ }
+ return;
+}
+
+sub get_all_methods {
+ my $self = shift;
+ my %methods = map { %{ $self->initialize($_)->get_method_map } } reverse $self->linearized_isa;
+ return values %methods;
+}
+
+# compatibility
+sub compute_all_applicable_methods {
+ return map {
+ {
+ name => $_->name,
+ class => $_->package_name,
+ code => $_, # sigh, overloading
+ },
+ } shift->get_all_methods(@_);
+}
+
+sub get_all_method_names {
+ my $self = shift;
+ my %uniq;
+ grep { $uniq{$_}++ == 0 } map { $_->name } $self->get_all_methods;
+}
+
+sub find_all_methods_by_name {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name to find";
+ my @methods;
+ foreach my $class ($self->linearized_isa) {
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ push @methods => {
+ name => $method_name,
+ class => $class,
+ code => $meta->get_method($method_name)
+ } if $meta->has_method($method_name);
+ }
+ return @methods;
+}
+
+sub find_next_method_by_name {
+ my ($self, $method_name) = @_;
+ (defined $method_name && $method_name)
+ || confess "You must define a method name to find";
+ my @cpl = $self->linearized_isa;
+ shift @cpl; # discard ourselves
+ foreach my $class (@cpl) {
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ return $meta->get_method($method_name)
+ if $meta->has_method($method_name);
+ }
+ return;
+}
+
+## Attributes
+
+sub add_attribute {
+ my $self = shift;
+ # either we have an attribute object already
+ # or we need to create one from the args provided
+ my $attribute = blessed($_[0]) ? $_[0] : $self->attribute_metaclass->new(@_);
+ # make sure it is derived from the correct type though
+ ($attribute->isa('Class::MOP::Attribute'))
+ || confess "Your attribute must be an instance of Class::MOP::Attribute (or a subclass)";
+
+ # first we attach our new attribute
+ # because it might need certain information
+ # about the class which it is attached to
+ $attribute->attach_to_class($self);
+
+ # then we remove attributes of a conflicting
+ # name here so that we can properly detach
+ # the old attr object, and remove any
+ # accessors it would have generated
+ if ( $self->has_attribute($attribute->name) ) {
+ $self->remove_attribute($attribute->name);
+ } else {
+ $self->invalidate_meta_instances();
+ }
+
+ # then onto installing the new accessors
+ $self->get_attribute_map->{$attribute->name} = $attribute;
+
+ # invalidate package flag here
+ my $e = do { local $@; eval { $attribute->install_accessors() }; $@ };
+ if ( $e ) {
+ $self->remove_attribute($attribute->name);
+ die $e;
+ }
+
+ return $attribute;
+}
+
+sub update_meta_instance_dependencies {
+ my $self = shift;
+
+ if ( $self->{meta_instance_dependencies} ) {
+ return $self->add_meta_instance_dependencies;
+ }
+}
+
+sub add_meta_instance_dependencies {
+ my $self = shift;
+
+ $self->remove_meta_instance_dependencies;
+
+ my @attrs = $self->compute_all_applicable_attributes();
+
+ my %seen;
+ my @classes = grep { not $seen{$_->name}++ } map { $_->associated_class } @attrs;
+
+ foreach my $class ( @classes ) {
+ $class->add_dependent_meta_instance($self);
+ }
+
+ $self->{meta_instance_dependencies} = \@classes;
+}
+
+sub remove_meta_instance_dependencies {
+ my $self = shift;
+
+ if ( my $classes = delete $self->{meta_instance_dependencies} ) {
+ foreach my $class ( @$classes ) {
+ $class->remove_dependent_meta_instance($self);
+ }
+
+ return $classes;
+ }
+
+ return;
+
+}
+
+sub add_dependent_meta_instance {
+ my ( $self, $metaclass ) = @_;
+ push @{ $self->{dependent_meta_instances} }, $metaclass;
+}
+
+sub remove_dependent_meta_instance {
+ my ( $self, $metaclass ) = @_;
+ my $name = $metaclass->name;
+ @$_ = grep { $_->name ne $name } @$_ for $self->{dependent_meta_instances};
+}
+
+sub invalidate_meta_instances {
+ my $self = shift;
+ $_->invalidate_meta_instance() for $self, @{ $self->{dependent_meta_instances} };
+}
+
+sub invalidate_meta_instance {
+ my $self = shift;
+ undef $self->{_meta_instance};
+}
+
+sub has_attribute {
+ my ($self, $attribute_name) = @_;
+ (defined $attribute_name && $attribute_name)
+ || confess "You must define an attribute name";
+ exists $self->get_attribute_map->{$attribute_name};
+}
+
+sub get_attribute {
+ my ($self, $attribute_name) = @_;
+ (defined $attribute_name && $attribute_name)
+ || confess "You must define an attribute name";
+ return $self->get_attribute_map->{$attribute_name}
+ # NOTE:
+ # this will return undef anyway, so no need ...
+ # if $self->has_attribute($attribute_name);
+ #return;
+}
+
+sub remove_attribute {
+ my ($self, $attribute_name) = @_;
+ (defined $attribute_name && $attribute_name)
+ || confess "You must define an attribute name";
+ my $removed_attribute = $self->get_attribute_map->{$attribute_name};
+ return unless defined $removed_attribute;
+ delete $self->get_attribute_map->{$attribute_name};
+ $self->invalidate_meta_instances();
+ $removed_attribute->remove_accessors();
+ $removed_attribute->detach_from_class();
+ return $removed_attribute;
+}
+
+sub get_attribute_list {
+ my $self = shift;
+ keys %{$self->get_attribute_map};
+}
+
+sub get_all_attributes {
+ shift->compute_all_applicable_attributes(@_);
+}
+
+sub compute_all_applicable_attributes {
+ my $self = shift;
+ my %attrs = map { %{ $self->initialize($_)->get_attribute_map } } reverse $self->linearized_isa;
+ return values %attrs;
+}
+
+sub find_attribute_by_name {
+ my ($self, $attr_name) = @_;
+ foreach my $class ($self->linearized_isa) {
+ # fetch the meta-class ...
+ my $meta = $self->initialize($class);
+ return $meta->get_attribute($attr_name)
+ if $meta->has_attribute($attr_name);
+ }
+ return;
+}
+
+# check if we can reinitialize
+sub is_pristine {
+ my $self = shift;
+
+ # if any local attr is defined
+ return if $self->get_attribute_list;
+
+ # or any non-declared methods
+ if ( my @methods = values %{ $self->get_method_map } ) {
+ my $metaclass = $self->method_metaclass;
+ foreach my $method ( @methods ) {
+ return if $method->isa("Class::MOP::Method::Generated");
+ # FIXME do we need to enforce this too? return unless $method->isa($metaclass);
+ }
+ }
+
+ return 1;
+}
+
+## Class closing
+
+sub is_mutable { 1 }
+sub is_immutable { 0 }
+
+sub immutable_transformer { $_[0]->{immutable_transformer} }
+sub _set_immutable_transformer { $_[0]->{immutable_transformer} = $_[1] }
+
+{
+ my %Default_Immutable_Options = (
+ read_only => [qw/superclasses/],
+ cannot_call => [
+ qw/
+ add_method
+ alias_method
+ remove_method
+ add_attribute
+ remove_attribute
+ remove_package_symbol
+ /
+ ],
+ memoize => {
+ class_precedence_list => 'ARRAY',
+ # FIXME perl 5.10 memoizes this on its own, no need?
+ linearized_isa => 'ARRAY',
+ get_all_methods => 'ARRAY',
+ get_all_method_names => 'ARRAY',
+ compute_all_applicable_attributes => 'ARRAY',
+ get_meta_instance => 'SCALAR',
+ get_method_map => 'SCALAR',
+ },
+
+ # NOTE:
+ # this is ugly, but so are typeglobs,
+ # so whattayahgonnadoboutit
+ # - SL
+ wrapped => {
+ add_package_symbol => sub {
+ my $original = shift;
+ confess "Cannot add package symbols to an immutable metaclass"
+ unless ( caller(2) )[3] eq
+ 'Class::MOP::Package::get_package_symbol';
+
+ # This is a workaround for a bug in 5.8.1 which thinks that
+ # goto $original->body
+ # is trying to go to a label
+ my $body = $original->body;
+ goto $body;
+ },
+ },
+ );
+
+ sub make_immutable {
+ my $self = shift;
+
+ return if $self->is_immutable;
+
+ my $transformer = $self->immutable_transformer
+ || Class::MOP::Immutable->new(
+ $self,
+ %Default_Immutable_Options,
+ @_
+ );
+
+ $self->_set_immutable_transformer($transformer);
+
+ $transformer->make_metaclass_immutable;
+ }
+}
+
+sub make_mutable {
+ my $self = shift;
+
+ return if $self->is_mutable;
+
+ $self->immutable_transformer->make_metaclass_mutable;
}
1;
=pod
-=head1 NAME
+=head1 NAME
Class::MOP::Class - Class Meta Object
=head1 SYNOPSIS
+ # assuming that class Foo
+ # has been defined, you can
+
+ # use this for introspection ...
+
+ # add a method to Foo ...
+ Foo->meta->add_method( 'bar' => sub {...} )
+
+ # get a list of all the classes searched
+ # the method dispatcher in the correct order
+ Foo->meta->class_precedence_list()
+
+ # remove a method from Foo
+ Foo->meta->remove_method('bar');
+
+ # or use this to actually create classes ...
+
+ Class::MOP::Class->create(
+ 'Bar' => (
+ version => '0.01',
+ superclasses => ['Foo'],
+ attributes => [
+ Class::MOP:: : Attribute->new('$bar'),
+ Class::MOP:: : Attribute->new('$baz'),
+ ],
+ methods => {
+ calculate_bar => sub {...},
+ construct_baz => sub {...}
+ }
+ )
+ );
+
=head1 DESCRIPTION
-=head1 AUTHOR
+The Class Protocol is the largest and most complex part of the
+Class::MOP meta-object protocol. It controls the introspection and
+manipulation of Perl 5 classes, and it can create them as well. The
+best way to understand what this module can do, is to read the
+documentation for each of its methods.
+
+=head1 INHERITANCE
+
+C<Class::MOP::Class> is a subclass of L<Class::MOP::Module>.
+
+=head1 METHODS
+
+=head2 Class construction
+
+These methods all create new C<Class::MOP::Class> objects. These
+objects can represent existing classes, or they can be used to create
+new classes from scratch.
+
+The metaclass object for a given class is a singleton. If you attempt
+to create a metaclass for the same class twice, you will just get the
+existing object.
+
+=over 4
+
+=item B<< Class::MOP::Class->create($package_name, %options) >>
+
+This method creates a new C<Class::MOP::Class> object with the given
+package name. It accepts a number of options.
+
+=over 8
+
+=item * version
+
+An optional version number for the newly created package.
+
+=item * authority
+
+An optional authority for the newly created package.
+
+=item * superclasses
+
+An optional array reference of superclass names.
+
+=item * methods
+
+An optional hash reference of methods for the class. The keys of the
+hash reference are method names, and values are subroutine references.
+
+=item * attributes
+
+An optional array reference of attributes.
+
+An attribute can be passed as an existing L<Class::MOP::Attribute>
+object, I<or> or as a hash reference of options which will be passed
+to the attribute metaclass's constructor.
+
+=back
+
+=item B<< Class::MOP::Class->create_anon_class(%options) >>
+
+This method works just like C<< Class::MOP::Class->create >> but it
+creates an "anonymous" class. In fact, the class does have a name, but
+that name is a unique name generated internally by this module.
+
+It accepts the same C<superclasses>, C<methods>, and C<attributes>
+parameters that C<create> accepts.
+
+Anonymous classes are destroyed once the metaclass they are attached
+to goes out of scope, and will be removed from Perl's internal symbol
+table.
+
+All instances of an anonymous class keep a special reference to the
+metaclass object, which prevents the metaclass from going out of scope
+while any instances exist.
+
+This only works if the instance if based on a hash reference, however.
+
+=item B<< Class::MOP::Class->initialize($package_name, %options) >>
+
+This method will initialize a C<Class::MOP::Class> object for the
+named package. Unlike C<create>, this method I<will not> create a new
+class.
+
+The purpose of this method is to retrieve a C<Class::MOP::Class>
+object for introspecting an existing class.
+
+If an existing C<Class::MOP::Class> object exists for the named
+package, it will be returned, and any options provided will be
+ignored!
+
+If the object does not yet exist, it will be created.
+
+The valid options that can be passed to this method are
+C<attribute_metaclass>, C<method_metaclass>,
+C<wrapped_method_metaclass>, and C<instance_metaclass>. These are all
+optional, and default to the appropriate class in the C<Class::MOP>
+distribution.
+
+=back
+
+=head2 Object instance construction and cloning
+
+These methods are all related to creating and/or cloning object
+instances.
+
+=over 4
+
+=item B<< $metaclass->clone_object($instance, %params) >>
+
+This method clones an existing object instance. Any parameters you
+provide are will override existing attribute values in the object.
+
+This is a convenience method for cloning an object instance, then
+blessing it into the appropriate package.
+
+You could implement a clone method in your class, using this method:
+
+ sub clone {
+ my ($self, %params) = @_;
+ $self->meta->clone_object($self, %params);
+ }
+
+=item B<< $metaclass->rebless_instance($instance, %params) >>
+
+This method changes the class of C<$instance> to the metaclass's class.
+
+You can only rebless an instance into a subclass of its current
+class. If you pass any additional parameters, these will be treated
+like constructor parameters and used to initialize the object's
+attributes. Any existing attributes that are already set will be
+overwritten.
+
+=item B<< $metaclass->new_object(%params) >>
+
+This method is used to create a new object of the metaclass's
+class. Any parameters you provide are used to initialize the
+instance's attributes.
+
+=item B<< $metaclass->instance_metaclass >>
+
+Returns the class name of the instance metaclass, see
+L<Class::MOP::Instance> for more information on the instance
+metaclasses.
+
+=item B<< $metaclass->get_meta_instance >>
+
+Returns an instance of the C<instance_metaclass> to be used in the
+construction of a new instance of the class.
+
+=back
+
+=head2 Informational predicates
+
+These are a few predicate methods for asking information about the
+class itself.
+
+=over 4
+
+=item B<< $metaclass->is_anon_class >>
+
+This returns true if the class was created by calling C<<
+Class::MOP::Class->create_anon_class >>.
+
+=item B<< $metaclass->is_mutable >>
+
+This returns true if the class is still mutable.
+
+=item B<< $metaclass->is_immutable >>
+
+This returns true if the class has been made immutable.
+
+=item B<< $metaclass->is_pristine >>
+
+A class is I<not> pristine if it has non-inherited attributes or if it
+has any generated methods.
+
+=back
+
+=head2 Inheritance Relationships
+
+=over 4
+
+=item B<< $metaclass->superclasses(@superclasses) >>
+
+This is a read-write accessor which represents the superclass
+relationships of the metaclass's class.
+
+This is basically sugar around getting and setting C<@ISA>.
+
+=item B<< $metaclass->class_precedence_list >>
+
+This returns a list of all of the class's ancestor classes. The
+classes are returned in method dispatch order.
+
+=item B<< $metaclass->linearized_isa >>
+
+This returns a list based on C<class_precedence_list> but with all
+duplicates removed.
+
+=item B<< $metaclass->subclasses >>
+
+This returns a list of subclasses for this class.
+
+=back
+
+=head2 Method introspection and creation
+
+These methods allow you to introspect a class's methods, as well as
+add, remove, or change methods.
+
+Determining what is truly a method in a Perl 5 class requires some
+heuristics (aka guessing).
+
+Methods defined outside the package with a fully qualified name (C<sub
+Package::name { ... }>) will be included. Similarly, methods named
+with a fully qualified name using L<Sub::Name> are also included.
+
+However, we attempt to ignore imported functions.
+
+Ultimately, we are using heuristics to determine what truly is a
+method in a class, and these heuristics may get the wrong answer in
+some edge cases. However, for most "normal" cases the heuristics work
+correctly.
+
+=over 4
+
+=item B<< $metaclass->get_method($method_name) >>
+
+This will return a L<Class::MOP::Method> for the specified
+C<$method_name>. If the class does not have the specified method, it
+returns C<undef>
+
+=item B<< $metaclass->has_method($method_name) >>
+
+Returns a boolean indicating whether or not the class defines the
+named method. It does not include methods inherited from parent
+classes.
+
+=item B<< $metaclass->get_method_map >>
+
+Returns a hash reference representing the methods defined in this
+class. The keys are method names and the values are
+L<Class::MOP::Method> objects.
+
+=item B<< $metaclass->get_method_list >>
+
+This will return a list of method I<names> for all methods defined in
+this class.
+
+=item B<< $metaclass->get_all_methods >>
+
+This will traverse the inheritance hierarchy and return a list of all
+the L<Class::MOP::Method> objects for this class and its parents.
+
+=item B<< $metaclass->find_method_by_name($method_name) >>
+
+This will return a L<Class::MOP::Method> for the specified
+C<$method_name>. If the class does not have the specified method, it
+returns C<undef>
+
+Unlike C<get_method>, this method I<will> look for the named method in
+superclasses.
+
+=item B<< $metaclass->get_all_method_names >>
+
+This will return a list of method I<names> for all of this class's
+methods, including inherited methods.
+
+=item B<< $metaclass->find_all_methods_by_name($method_name) >>
+
+This method looks for the named method in the class and all of its
+parents. It returns every matching method it finds in the inheritance
+tree, so it returns a list of methods.
+
+Each method is returned as a hash reference with three keys. The keys
+are C<name>, C<class>, and C<code>. The C<code> key has a
+L<Class::MOP::Method> object as its value.
+
+The list of methods is distinct.
+
+=item B<< $metaclass->find_next_method_by_name($method_name) >>
+
+This method returns the first method in any superclass matching the
+given name. It is effectively the method that C<SUPER::$method_name>
+would dispatch to.
+
+=item B<< $metaclass->add_method($method_name, $method) >>
+
+This method takes a method name and a subroutine reference, and adds
+the method to the class.
+
+The subroutine reference can be a L<Class::MOP::Method>, and you are
+strongly encouraged to pass a meta method object instead of a code
+reference. If you do so, that object gets stored as part of the
+class's method map directly. If not, the meta information will have to
+be recreated later, and may be incorrect.
+
+If you provide a method object, this method will clone that object if
+the object's package name does not match the class name. This lets us
+track the original source of any methods added from other classes
+(notably Moose roles).
+
+=item B<< $metaclass->remove_method($method_name) >>
+
+Remove the named method from the class. This method returns the
+L<Class::MOP::Method> object for the method.
+
+=back
+
+=head2 Attribute introspection and creation
+
+Because Perl 5 does not have a core concept of attributes in classes,
+we can only return information about attributes which have been added
+via this class's methods. We cannot discover information about
+attributes which are defined in terms of "regular" Perl 5 methods.
+
+=over 4
+
+=item B<< $metaclass->get_attribute($attribute_name) >>
+
+This will return a L<Class::MOP::Attribute> for the specified
+C<$attribute_name>. If the class does not have the specified
+attribute, it returns C<undef>
+
+=item B<< $metaclass->has_attribute($attribute_name) >>
+
+Returns a boolean indicating whether or not the class defines the
+named attribute. It does not include attributes inherited from parent
+classes.
+
+=item B<< $metaclass->get_attribute_map >>
+
+Returns a hash reference representing the attributes defined in this
+class. The keys are attribute names and the values are
+L<Class::MOP::Attribute> objects.
+
+=item B<< $metaclass->get_attribute_list >>
+
+This will return a list of attributes I<names> for all attributes
+defined in this class.
+
+=item B<< $metaclass->get_all_attributes >>
+
+This will traverse the inheritance hierarchy and return a list of all
+the L<Class::MOP::Attribute> objects for this class and its parents.
+
+This method can also be called as C<compute_all_applicable_attributes>.
+
+=item B<< $metaclass->find_attribute_by_name($attribute_name) >>
+
+This will return a L<Class::MOP::Attribute> for the specified
+C<$attribute_name>. If the class does not have the specified
+attribute, it returns C<undef>
+
+Unlike C<get_attribute>, this attribute I<will> look for the named
+attribute in superclasses.
+
+=item B<< $metaclass->add_attribute(...) >>
+
+This method accepts either an existing L<Class::MOP::Attribute>
+object, or parameters suitable for passing to that class's C<new>
+method.
+
+The attribute provided will be added to the class.
+
+Any accessor methods defined by the attribute will be added to the
+class when the attribute is added.
+
+If an attribute of the same name already exists, the old attribute
+will be removed first.
+
+=item B<< $metaclass->remove_attribute($attribute_name) >>
+
+This will remove the named attribute from the class, and
+L<Class::MOP::Attribute> object.
+
+Removing an attribute also removes any accessor methods defined by the
+attribute.
+
+However, note that removing an attribute will only affect I<future>
+object instances created for this class, not existing instances.
+
+=item B<< $metaclass->attribute_metaclass >>
+
+Returns the class name of the attribute metaclass for this class. By
+default, this is L<Class::MOP::Attribute>. for more information on
+
+=back
+
+=head2 Class Immutability
+
+Making a class immutable "freezes" the class definition. You can no
+longer call methods which alter the class, such as adding or removing
+methods or attributes.
+
+Making a class immutable lets us optimize the class by inlining some
+methods, and also allows us to optimize some methods on the metaclass
+object itself.
+
+The immutabilization system in L<Moose> takes much greater advantage
+of the inlining features than Class::MOP itself does.
+
+=over 4
+
+=item B<< $metaclass->make_immutable(%options) >>
+
+This method will create an immutable transformer and uses it to make
+the class and its metaclass object immutable.
+
+Details of how immutabilization works are in L<Class::MOP::Immutable>
+documentation.
+
+=item B<< $metaclass->make_mutable >>
+
+Calling this method reverse the immutabilization transformation.
+
+=item B<< $metaclass->immutable_transformer >>
+
+If the class has been made immutable previously, this returns the
+L<Class::MOP::Immutable> object that was created to do the
+transformation.
+
+If the class was never made immutable, this method will die.
+
+=back
+
+=head2 Method Modifiers
+
+Method modifiers are hooks which allow a method to be wrapped with
+I<before>, I<after> and I<around> method modifiers. Every time a
+method is called, it's modifiers are also called.
+
+A class can modify its own methods, as well as methods defined in
+parent classes.
+
+=head3 How method modifiers work?
+
+Method modifiers work by wrapping the original method and then
+replacing it in the class's symbol table. The wrappers will handle
+calling all the modifiers in the appropriate order and preserving the
+calling context for the original method.
+
+The return values of C<before> and C<after> modifiers are
+ignored. This is because their purpose is B<not> to filter the input
+and output of the primary method (this is done with an I<around>
+modifier).
+
+This may seem like an odd restriction to some, but doing this allows
+for simple code to be added at the beginning or end of a method call
+without altering the function of the wrapped method or placing any
+extra responsibility on the code of the modifier.
+
+Of course if you have more complex needs, you can use the C<around>
+modifier which allows you to change both the parameters passed to the
+wrapped method, as well as its return value.
+
+Before and around modifiers are called in last-defined-first-called
+order, while after modifiers are called in first-defined-first-called
+order. So the call tree might looks something like this:
+
+ before 2
+ before 1
+ around 2
+ around 1
+ primary
+ around 1
+ around 2
+ after 1
+ after 2
+
+=head3 What is the performance impact?
+
+Of course there is a performance cost associated with method
+modifiers, but we have made every effort to make that cost directly
+proportional to the number of modifier features you utilize.
+
+The wrapping method does it's best to B<only> do as much work as it
+absolutely needs to. In order to do this we have moved some of the
+performance costs to set-up time, where they are easier to amortize.
+
+All this said, our benchmarks have indicated the following:
+
+ simple wrapper with no modifiers 100% slower
+ simple wrapper with simple before modifier 400% slower
+ simple wrapper with simple after modifier 450% slower
+ simple wrapper with simple around modifier 500-550% slower
+ simple wrapper with all 3 modifiers 1100% slower
+
+These numbers may seem daunting, but you must remember, every feature
+comes with some cost. To put things in perspective, just doing a
+simple C<AUTOLOAD> which does nothing but extract the name of the
+method called and return it costs about 400% over a normal method
+call.
+
+=over 4
+
+=item B<< $metaclass->add_before_method_modifier($method_name, $code) >>
+
+This wraps the specified method with the supplied subroutine
+reference. The modifier will be called as a method itself, and will
+receive the same arguments as are passed to the method.
+
+When the modifier exits, the wrapped method will be called.
+
+The return value of the modifier will be ignored.
+
+=item B<< $metaclass->add_after_method_modifier($method_name, $code) >>
+
+This wraps the specified method with the supplied subroutine
+reference. The modifier will be called as a method itself, and will
+receive the same arguments as are passed to the method.
+
+When the wrapped methods exits, the modifier will be called.
+
+The return value of the modifier will be ignored.
+
+=item B<< $metaclass->add_around_method_modifier($method_name, $code) >>
+
+This wraps the specified method with the supplied subroutine
+reference.
+
+The first argument passed to the modifier will be a subroutine
+reference to the wrapped method. The second argument is the object,
+and after that come any arguments passed when the method is called.
+
+The around modifier can choose to call the original method, as well as
+what arguments to pass if it does so.
+
+The return value of the modifier is what will be seen by the caller.
+
+=back
+
+=head2 Introspection
+
+=over 4
+
+=item B<< Class::MOP::Class->meta >>
+
+This will return a L<Class::MOP::Class> instance for this class.
+
+It should also be noted that L<Class::MOP> will actually bootstrap
+this module by installing a number of attribute meta-objects into its
+metaclass.
+
+=back
+
+=head1 AUTHORS
-Stevan Little E<gt>stevan@iinteractive.comE<lt>
+Stevan Little E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
-Copyright 2006 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
-it under the same terms as Perl itself.
+it under the same terms as Perl itself.
-=cut
\ No newline at end of file
+=cut
projects / gitmo/Class-MOP.git / blobdiff