The common Lisp object system metaobject kernel: a status report
LFP '88 Proceedings of the 1988 ACM conference on LISP and functional programming
The Dylan reference manual: the definitive guide to the new object-oriented dynamic language
The Dylan reference manual: the definitive guide to the new object-oriented dynamic language
The Art of the Metaobject Protocol
The Art of the Metaobject Protocol
Revised Report on the Algorithmic Language Scheme
Higher-Order and Symbolic Computation
Common Lisp: The Language
SBCL: A Sanely-Bootstrappable Common Lisp
Self-Sustaining Systems
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Common Lisp is often touted as the programmable programming language, yet it sometimes places large barriers in the way, with the best of intentions. One of those barriers is a limit to the extensibility by the user of certain core language constructs, such as the ability to define subclasses of built in classes usable with standard functions: even where this could be achievable with minimal penalties. We introduce the notion of user-extensible sequences, describing a protocol which implementations of such classes should follow. We show examples of their use, and discuss the issues observed in providing support for this protocol in a Common Lisp, including ensuring that there is no performance impact from its inclusion.