:for code :solo class Metamodel::ParametricRoleGroupHOW does Metamodel::Naming does Metamodel::Documenting does Metamodel::Stashing does Metamodel::TypePretense does Metamodel::RolePunning does Metamodel::BoolificationProtocol {}
Warning: this role is part of the Rakudo implementation, and is not a part of the language specification.
A ParametricRoleGroupHOW
groups a set of ParametricRoleHOW
, every one of them representing a single role declaration with their own parameter sets.
(role Zape[::T] {}).HOW.say; # OUTPUT: «Perl6::Metamodel::ParametricRoleHOW.new» Zape.HOW.say ; # OUTPUT: «Perl6::Metamodel::ParametricRoleGroupHOW.new»
ParametricRoleHOW
s need to be added to this kind of group:
my \zape := Metamodel::ParametricRoleGroupHOW.new_type( name => "zape"); my \zipi := Metamodel::ParametricRoleHOW.new_type( name => "zipi", group => zape); say zipi.HOW; # OUTPUT: «Perl6::Metamodel::ParametricRoleHOW.new»
Role groups 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.