So in Clojure, I'd have:
(defrecord MyNode [^Node node]
clojure.lang. ISeq
(seq [this] …))
Thanks Mikera! An enlightenment to me!
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On Wed, Mar 18, 2015 at 2:11 PM, Mikera <[email protected]>
wrote:
> In that case, I would suggest writing a minimal wrapper, either in Java or
> Clojure.
> To get the basic sequence operations, you can simply implement the
> interface clojure.lang.ISeq on the wrapper.
> On Wednesday, 18 March 2015 09:17:09 UTC+8, juvenn wrote:
>>
>> Thanks Niels, but what if a java class is not available for rewrite? Say,
>> it is from an external library.
>>
>> —
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>>
>>
>> On Tue, Mar 17, 2015 at 10:01 PM, Niels van Klaveren <
>> [email protected] <javascript:>> wrote:
>>
>>> If a java class implements Iterable, it automatically supports seq.
>>>
>>> On Tuesday, March 17, 2015 at 11:34:17 AM UTC+1, juvenn wrote:
>>>>
>>>> Dear all,
>>>>
>>>> Given a node type from singly linked list:
>>>>
>>>> class Node {
>>>> int val;
>>>> Node next;
>>>> }
>>>>
>>>> How do I extend it so `(seq node)` will return a sequence of values? And
>>>> generally first, rest, and next will work on node too.
>>>>
>>>> While in Java, we could define the class to implement Iterable to
>>>> achieve this. In Clojure we do have `extend-type`, but it seems not
>>>> accepting interfaces to extend, nor do I find protocol for seqable.
>>>>
>>>> So generally, given a class defined in Java, assuming it is not
>>>> available for rewrite, how shall we extend the class to participate in
>>>> sequence operations in Clojure?
>>>>
>>>> Thanks in advance!
>>>>
>>>> —
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>>>>
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>>
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