EIEIO EIEIO (“Enhanced Implementation of Emacs Interpreted Objects”) provides an Object Oriented layer for Emacs Lisp, following the basic concepts of the Common Lisp Object System (CLOS). It provides a framework for writing object-oriented applications in Emacs. This manual documents EIEIO, an object framework for Emacs Lisp. Copyright © 2007–2024 Free Software Foundation, Inc. Permission is gran