Support in Languages and Tools
The following are some of the most prominent programming languages that support metaclasses.
- Common Lisp, via CLOS
- Delphi and other versions of Object Pascal influenced by it
- Groovy
- Objective-C
- Python
- Perl, via the metaclass pragma, as well as Moose
- Ruby
- Smalltalk
Some less widespread languages that support metaclasses include OpenJava, OpenC++, OpenAda, CorbaScript, ObjVLisp, Object-Z, MODEL-K, XOTcl, and MELDC. Several of these languages date from the early 1990s and are of academic interest.
Logtalk, an object-oriented extension of Prolog, also supports metaclasses.
Resource Description Framework (RDF) and Unified Modeling Language (UML) both support metaclasses.
Read more about this topic: Metaclass
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