I am trying to generate a var for use in a generator for a stream. As
a simple example, let's try to create a stream of integers. My first
attempt at the generator was:
(with-local-vars [n 0]
(defn integers [_]
(let [current (var-get n)]
(var-set n (inc current))
current)))
I thought this would create a var n initialized to zero that would be
captured in the closure. But it doesn't work:
(integers nil)
java.lang.IllegalStateException: Var null/null is unbound.
(NO_SOURCE_FILE:0)
Next try: create the local inside the function:
(defn integers [_]
(with-local-vars [n 0]
(let [current (var-get n)]
(var-set n (inc current))
current)))
This works but, as I expected, the var is initialized at every call,
so the generator returns zero forever.
I didn't find any other way to create a local var, so I am a bit at a
loss. Any ideas?
Konrad.
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