1 package MooseX::Singleton::Role::Meta::Method::Constructor;
5 $VERSION = eval $VERSION;
7 override _initialize_body => sub {
11 # the %options should also include a both
12 # a call 'initializer' and call 'SUPER::'
13 # options, which should cover approx 90%
14 # of the possible use cases (even if it
15 # requires some adaption on the part of
16 # the author, after all, nothing is free)
18 $source .= "\n" . 'my $class = shift;';
21 . 'my $existing = do { no strict "refs"; no warnings "once"; \${"$class\::singleton"}; };';
22 $source .= "\n" . 'return ${$existing} if ${$existing};';
24 $source .= "\n" . 'return $class->Moose::Object::new(@_)';
28 . $self->associated_metaclass->name . '\';';
30 $source .= $self->_generate_params( '$params', '$class' );
31 $source .= $self->_generate_instance( '$instance', '$class' );
32 $source .= $self->_generate_slot_initializers;
34 $source .= ";\n" . $self->_generate_triggers();
35 $source .= ";\n" . $self->_generate_BUILDALL();
37 $source .= ";\n" . 'return ${$existing} = $instance';
38 $source .= ";\n" . '}';
39 warn $source if $self->options->{debug};
41 my $attrs = $self->_attributes;
44 = map { $_->can('type_constraint') ? $_->type_constraint : undef }
47 my @type_constraint_bodies
48 = map { defined $_ ? $_->_compiled_type_constraint : undef; }
51 my $defaults = [map { $_->default } @$attrs];
53 my ( $code, $e ) = $self->_compile_code(
58 '$defaults' => \$defaults,
59 '@type_constraints' => \@type_constraints,
60 '@type_constraint_bodies' => \@type_constraint_bodies,
65 "Could not eval the constructor :\n\n$source\n\nbecause :\n\n$e",
66 error => $e, data => $source )
69 $self->{'body'} = $code;
72 # Ideally we'd be setting this in the constructor, but the new() methods in
73 # what the parent classes are not well-factored.
75 # This is all a nasty hack, though. We need to fix Class::MOP::Inlined to
76 # allow constructor class roles to say "if the parent class has role X,
78 override _expected_method_class => sub {
81 my $super_value = super();
82 if ( $super_value eq 'Moose::Object' ) {
83 for my $parent ( map { Class::MOP::class_of($_) }
84 $self->associated_metaclass->superclasses ) {
86 if $parent->is_anon_class
87 && grep { $_->name eq 'Moose::Object' }
88 map { Class::MOP::class_of($_) } $parent->superclasses;
105 MooseX::Singleton::Role::Meta::Method::Constructor - Constructor method role for MooseX::Singleton
109 This role overrides the generated object C<new> method so that it returns the
110 singleton if it already exists.