LisPi@natty Because it's completely unnecessary in proper #Object systems like #CLOS.
That is to say, #multimethod / #GenericFunction based object systems.
Jörg PreisendörferNote that the #PrettyPrinting dispatch tables of #CommonLisp conceptionally are a #GenericFunction with #ParametricDispatch.
The function SET-PPRINT-DISPATCH is essentially an ADD-METHOD to the pretty printing parametric dispatch.
(Unfortunatly, the canonical, #ProofOfConcept implementation of PP by #RichardWaters is one single convoluted mess; basically a negative example of software design, even by standards of its time.)
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Jörg Preisendörfer@thatgeoguy The #PrettyPrint dispatch table of #CommonLisp is conceptually a #GenericFunction with parametric dispatch, altough not formalized as such and not a formal part of the Common Lisp Object System (CLOS).
However, it is possibly to extend #CLOS for #ParametricDispatch using the #MetaObjectProtocol (#MOP).
The Metaobject Protocol is not part of the formal CL standard, but is respected as de-facto standard, since about every CL implementation will stick to it. The protocol is described in The Art of the Meta-Object Protocol by Gregor Kiczales, Jim des Rivieres and Daniel G. Bobrow.
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🦎 https://t.me/FamilyOfLisp
🏷️ #Lisp #Scheme
However, it is possibly to extend #CLOS for #ParametricDispatch using the #MetaObjectProtocol (#MOP).
The Metaobject Protocol is not part of the formal CL standard, but is respected as de-facto standard, since about every CL implementation will stick to it. The protocol is described in The Art of the Meta-Object Protocol by Gregor Kiczales, Jim des Rivieres and Daniel G. Bobrow.
🌺
🦎 https://t.me/FamilyOfLisp
🏷️ #Lisp #Scheme