I use a lot of multimethods with my framework, Ciste[0] and it can work,
the only thing is you have to be very careful about what you put where,
and it helps to have a lot of namespaces.
What I do is try to keep all of my defmulti's in one namespace and have
only defmethod's in another namespace.
On Friday, March 2, 2012 7:03:10 AM UTC-6, tim.visher wrote:
>
> I will not in any way claim to know how or why this works. I'm just
> starting to use multimethods myself, but I'll give you my set up that
> appears to be working at the moment.
>
> I have a namespace:
>
> (ns store.store)
>
>
I built a modeling system that uses the multi-method namespace separation
you are talking about. The solution that I use simply leverages the
difference between require, use, and refer. In each namespace that
implements the multi-method, put (refer 'parent) after the ns form. In the
parent name
On Thu, Mar 1, 2012 at 8:33 PM, Cymen Vig wrote:
> I attempted to do something like this:
>
> (ns parent)
> (defmulti my-method (fn [x] (:method x))
>
> (ns child1)
> (defmethod my-method :zzz
> ...)
>
> (ns child2)
> (defmethod my-method :aaa
> ...)
>
> However the problem is the children nee
I attempted to do something like this:
(ns parent)
(defmulti my-method (fn [x] (:method x))
(ns child1)
(defmethod my-method :zzz
...)
(ns child2)
(defmethod my-method :aaa
...)
However the problem is the children need to use the parent namespace in
order to have the method definition and
a reference (pointer) to ref1
user=> (dosync (ref-set aref2 {:a aref1}))
{:a #
{:java.lang.StackOverflowError
4. So, I've got a stack overflow... What's the proper way to deal with
this? Are circular references like this not allowed?
Circular references are allowed, the problem is with
ror
>>
>>
>>
>> 4. So, I've got a stack overflow... What's the proper way to deal with
>> this? Are circular references like this not allowed?
>
> Circular references are allowed, the problem is with the repl trying to
> print them. You can set the
Todd writes:
> 3. alter ref2 to have a reference (pointer) to ref1
>
> user=> (dosync (ref-set aref2 {:a aref1}))
> {:a # # # #
>
>
> {:java.lang.StackOverflowError
>
>
>
> 4. So, I've got a stack overflow... What's the proper way to deal with
Just a guess here, but it sounds like the infinite loop is in the
printing, because you entered this in at the REPL, and not a problem
with the actual creation of the circular reference.
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Are circular references supported in clojure?
1. create two refs
user=> (def aref1 (ref {}))
#'user/aref1
user=> (def aref2 (ref {}))
#'user/aref2
user=> aref1
#
user=> aref2
#
2. alter ref1 to have a reference to ref2
user=> (dosync (ref-set aref1 {:a aref2}))
{:a
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