role Metamodel::ParametricRoleHOW
Represents a non-instantiated, parameterized, role.
class Metamodel::ParametricRoleHOW
does Metamodel::Naming
does Metamodel::Documenting
does Metamodel::Versioning
does Metamodel::MethodContainer
does Metamodel::PrivateMethodContainer
does Metamodel::MultiMethodContainer
does Metamodel::AttributeContainer
does Metamodel::RoleContainer
does Metamodel::MultipleInheritance
does Metamodel::Stashing
does Metamodel::TypePretense
does Metamodel::RolePunning
does Metamodel::ArrayType {}
Warning: this class is part of the Rakudo implementation, and is not a part of the language specification.
A Metamodel::ParametricRoleHOW represents a non-instantiated, possibly
parameterized, role:
(role Zape[::T] {}).HOW.say;# OUTPUT: «Perl6::Metamodel::ParametricRoleHOW.new»
(role Zape {}).HOW.say; # OUTPUT: «Perl6::Metamodel::ParametricRoleHOW.new»
As usual, .new_type will create a new object of this class.
my \zipi := Metamodel::ParametricRoleHOW.new_type( name => "zape", group => "Zape");
say zipi.HOW; # OUTPUT: «Perl6::Metamodel::ParametricRoleHOW.new»
The extra group argument will need to be used to integrate it in a parametric
role group, which will need to be defined in advance.
Roles pretend to be of types Mu, Any, and Cool, and delegate methods to Any.
Note: As with most of the Metamodel classes, this one is mainly for illustration
purposes and is not intended for the end user to instantiate.