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.
Note: As most of the Metamodel classes, this one is here mainly for illustration purposes and it's not intended for the final user to instantiate, unless their intention is really to create a parametric role group.