Thanks. That sound good. I had played with eval, but wasn happy about this.
2013/7/31 Cedric Greevey <cgree...@gmail.com>
> If you saved the original function instance, you can use it to find the
> map. This should work:
>
> (let [f #(+ 1 1)
> s #{{:a 3 :b 5 :c f}}]
> (contains? s {:a 3 :b 5 :c f}))
>
> Note that the value for the :c key is now the same *instance* of that
> function.
>
> Storing the function source, with ', instead of the function itself works
> until you want to call the function. Then you need eval. You might want to
> avoid that, perhaps by using a map of quoted functions to compiled
> functions (you can also use something similar to avoid compiling each
> single one of these functions over and over again at runtime even if you do
> use eval -- or just (def meval (memoize eval)) and use meval, or something).
>
> If you don't use eval, you can use other keys instead of the function
> source; a suitable keyword name like :add-x might be good, so you'd end up
> with {:a 3 :b 5 :c :add-x} in your data structure and a {:add-x #(+ 1 1)}
> in a lookup table somewhere.
>
>
>
> On Wed, Jul 31, 2013 at 6:34 AM, Marcus Lindner <
> marcus.goldritter.lind...@gmail.com> wrote:
>
>> Ups. [?]
>> Sorry.
>> Have not seen this typo :(.
>>
>>
>> 2013/7/31 Jim <jimpil1...@gmail.com>
>>
>>> On 31/07/13 11:01, Goldritter wrote:
>>>
>>>> But when I tried to access the value I got an Exception
>>>> =>(c: {:a 3 :h 5 :c '#(+ 1 1)})
>>>> RuntimeException Invalid token: c: clojure.lang.Util.**runtimeException
>>>> (Util.java:219)
>>>> {:a 3, :c (fn* [] (+ 1 1)), :h 5}
>>>>
>>>> The same with get
>>>> => (get {:a 3 :h 5 :c '#(+ 1 1)} c:)
>>>> RuntimeException Invalid token: c: clojure.lang.Util.**runtimeException
>>>> (Util.java:219)
>>>> RuntimeException Unmatched delimiter: )
>>>> clojure.lang.Util.**runtimeException
>>>> (Util.java:219)
>>>>
>>>
>>> it seems to me that you wrote c: instead of :c ...try again with the
>>> correct key :)
>>>
>>> Jim
>>>
>>>
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