在Clojure中，如何检查对象是否为core.async通道？

Question

There is a function chan to create a channel. But I don't see a chan? . How would I write a predicate chan? that returns true for objects created by chan ?

I'm asking about both Clojure and ClojureScript.

Answer 1

Since channels are implemented as :

(deftype ManyToManyChannel [^LinkedList takes ^LinkedList puts ^Queue buf closed ^Lock mutex add!]
   ...)

You can just check if it's an instance of ManyToManyChannel :

(import [clojure.core.async.impl.channels ManyToManyChannel])

(instance? ManyToManyChannel obj)

Or, if you care more about the protocols rather than the type itself, you can check if the object satisfies? one the the protocols:

(satisfies? clojure.core.async.impl.protocols/WritePort
            obj)