Metaobject The Art of the Metaobject Protocol Signals and slots Common Lisp Object System Gauche (Scheme implementation) Joose (framework) OJ (programming tool) Open implementation Gregor Kiczales CLISP MOP First-class citizen Generic function LispWorks Department of Computer Science, University of British Columbia CMU Common Lisp Moose (Perl) CommonLoops Metaclass Class (computer programming) EuLisp WebSphere sMash Metaprogramming Programming language theory ProActive Reification (computer science) Multiple inheritance Design by contract Aspect-oriented programming Qt (software) Lisp (programming language) Common Lisp Object-oriented programming GObject Oberon-2 …

Mixin Meta-Object Facility Julia (programming language) List of programming languages by type Symbolic artificial intelligence Mutator method Pointer (computer programming) Python (programming language)