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Core.logic equivalent of multimethods

Description

I need to define predicates to which I can later (and from other namespaces) attach further clauses (so not just facts). I couldn't find any such functionality in the source. Due to the extensive use of macros, hacking such a system onto core.logic from the outside is extremely difficult, if not impossible (to me at least).

I'd love to implement this myself too, if given an OK and rough direction.

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David Nolen December 28, 2012 at 6:48 AM

I don't think the current implementation can really support this and I don't think it's wise to try to hack around the current implementation. I'd be willing to consider a comprehensive solution if someone is willing to do the legwork.

import April 4, 2012 at 12:27 AM

Comment made by: werg

I actually did manage to tack on a prototype that covers the basic behavior I would like to see: https://github.com/werg/herpderp/blob/master/src/herpderp/multo.clj

I use a set stored in a ref in the defne's metadata to manage dynamic changes to the clauses. Upon changing that set using defclause I use eval to re-define the var using defne.

This might not be nice, but allows me to continue developing features against it.

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Created April 3, 2012 at 1:32 AM
Updated December 28, 2012 at 6:48 AM