3 ms·

We already have all of the above in the form of libraries. Common Lisp is extensible.

• quotemstr 7y ago
  We don't have any of those. #'+ is part of the core and can't be extended. There's also no facility for type propagation in library form.
  • kgwgk 7y ago
    You can shadow + and use your own implementation in your code, falling back to cl:+ when appropriate. Changing the existing language may be difficult, but building a modified language on top of it is possible: see Shen.
  • vindarel 7y ago
    To extend #'+, equality functions and much more, see https://github.com/alex-gutev/generic-cl/ https://github.com/alex-gutev/generic-cl/. See also https://github.com/pnathan/generic-comparability https://github.com/pnathan/generic-comparability