Re: Extend java class to participate in sequence operations
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 mike.r.anderson...@gmail.com
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
niels.va...@gmail.com 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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Re: Extend java class to participate in sequence operations
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
niels.va...@gmail.com 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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Extend java class to participate in sequence operations
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!
—
Sent from Mailbox
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Re: Extend java class to participate in sequence operations
Thanks Niels, but what if a java class is not available for rewrite? Say, it is
from an external library.
—
Sent from Mailbox
On Tue, Mar 17, 2015 at 10:01 PM, Niels van Klaveren
niels.vanklave...@gmail.com 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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Re: Extend java class to participate in sequence operations
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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