role Metamodel::Versioning { ... }

Warning: this role is part of the Rakudo implementation, and is not a part of the language specification.

Metamodel role for (optionally) versioning metaobjects.

When you declare a type, you can pass it a version, author, and/or API and get them, like so:

class Versioned:ver<0.0.1>:auth<github:Kaiepi>:api<1> { }

say Versioned.^ver;  # OUTPUT: «v0.0.1␤»
say Versioned.^auth; # OUTPUT: «github:Kaiepi␤»
say Versioned.^api;  # OUTPUT: «1␤»

This is roughly equivalent to the following, which also sets them explicitly:

BEGIN {
    class Versioned { }
    Versioned.^set_ver:  v0.0.1;
    Versioned.^set_auth: 'github:Kaiepi';
    Versioned.^set_api:  <1>;
}

say Versioned.^ver;  # OUTPUT: «v0.0.1␤»
say Versioned.^auth; # OUTPUT: «github:Kaiepi␤»
say Versioned.^api;  # OUTPUT: «1␤»

Methods

method ver

method ver($obj)

Returns the version of the metaobject, if any, otherwise returns Mu.

method auth

method auth($obj)

Returns the author of the metaobject, if any, otherwise returns an empty string.

method api

method api($obj)

Returns the API of the metaobject, if any, otherwise returns an empty string.

method set_ver

method set_ver($obj, $ver)

Sets the version of the metaobject.

method set_auth

method set_auth($obj, $auth)

Sets the author of the metaobject.

method set_api

method set_api($obj, $api)

Sets the API of the metaobject.

Type Graph