I got it, guys! Thanks a lot! This non-tailrecursive version works as
intended:
(defn fix2 [f x] (let [y (f x)] (eval ({x x} y (list 'fix2 f y)))))
Dominikus
Am Freitag, 27. April 2012 17:00:52 UTC+2 schrieb Luke VanderHart:
>
> Using a map instead of if means that it is evaluated as a function call.
> Unlike the if form, function calls eval their arguments. So the (recur)
> form is getting eval'd prior to being passed to the map/function, which
> isn't a tail position.
>
> That's why "if" is a special form/macro, not a regular function (like maps
> are).
>
> On Friday, April 27, 2012 10:52:10 AM UTC-4, Dominikus wrote:
>>
>> Sure? The semantics of the default value corresponds to a 'if', doesn't
>> it? From this viewpoint, the default value is in tail position. And why
>> does the non-tailrecursive version not run as expected?
>>
>> Dominikus
>>
>>
>> Am Freitag, 27. April 2012 16:45:44 UTC+2 schrieb Meikel Brandmeyer
>> (kotarak):
>>>
>>> Hi,
>>>
>>> (defn fix2 [f x] (let [v (f x)] ({x x} v (recur f v))))
>>>
>>> recur is not in the tail position. The "call" to the map is the tail
>>> call. So the result is as expected.
>>>
>>> Kind regards,
>>> Meikel
>>>
>>>
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