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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