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package Moose::Meta::TypeConstraint::Parameterized;
use strict;
use warnings;
use metaclass;
use Scalar::Util 'blessed';
use Moose::Util::TypeConstraints;
use Moose::Meta::TypeConstraint::Parameterizable;
our $VERSION = '1.09';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::TypeConstraint';
__PACKAGE__->meta->add_attribute('type_parameter' => (
accessor => 'type_parameter',
predicate => 'has_type_parameter',
));
sub equals {
my ( $self, $type_or_name ) = @_;
my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
return unless $other->isa(__PACKAGE__);
return (
$self->type_parameter->equals( $other->type_parameter )
and
$self->parent->equals( $other->parent )
);
}
sub compile_type_constraint {
my $self = shift;
unless ( $self->has_type_parameter ) {
require Moose;
Moose->throw_error("You cannot create a Higher Order type without a type parameter");
}
my $type_parameter = $self->type_parameter;
unless ( blessed $type_parameter && $type_parameter->isa('Moose::Meta::TypeConstraint') ) {
require Moose;
Moose->throw_error("The type parameter must be a Moose meta type");
}
foreach my $type (Moose::Util::TypeConstraints::get_all_parameterizable_types()) {
if (my $constraint = $type->generate_constraint_for($self)) {
$self->_set_constraint($constraint);
return $self->SUPER::compile_type_constraint;
}
}
# if we get here, then we couldn't
# find a way to parameterize this type
require Moose;
Moose->throw_error("The " . $self->name . " constraint cannot be used, because "
. $self->parent->name . " doesn't subtype or coerce from a parameterizable type.");
}
sub create_child_type {
my ($self, %opts) = @_;
return Moose::Meta::TypeConstraint::Parameterizable->new(%opts, parent=>$self);
}
1;
__END__
=pod
=head1 NAME
Moose::Meta::TypeConstraint::Parameterized - Type constraints with a bound parameter (ArrayRef[Int])
=head1 METHODS
This class is intentionally not documented because the API is
confusing and needs some work.
=head1 INHERITANCE
C<Moose::Meta::TypeConstraint::Parameterized> is a subclass of
L<Moose::Meta::TypeConstraint>.
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Stevan Little E<lt>stevan@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 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.
=cut
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