Yes, pmap behaves as map with respect to the ordering of the elements
of the resulting sequence.
// ben
On Sat, Aug 11, 2012 at 9:29 PM, Jim - FooBar(); <jimpil1...@gmail.com> wrote:
> Hi all,
>
> I was wondering what assumptions does pmap take with regards to the ordering
> of the resulting seq? Can I assume it retains the original ordering or does
> it just cons whatever future returns earlier? In other words can I do this
> and feel safe?
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> (defn min-max [root? depth dir board]
> (if (zero? depth) (score b) ;reached bottom level - evaluate board
> (let [mapper (if root? 'pmap 'map) ;if at root-node create futures
> team (filter #(= dir (:direction %)) board) ;all the team-mates
> (with same direction)
> successors (concat (map #(core/getMoves %) team)) ;concat all
> potential moves
> result (->> successors
> (map core/try-move) ;try them all (producing boards)
> (mapper (partial min-max false (dec depth) (- dir))))];pass the
> resulting boards back to recursion with direction inverted
> (get (vec successors)
> (.indexOf result (apply max result))))))
>
> (def search (partial min-max true))
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> It seems to me like a very succinct and idiomatic way to implement the
> min-max algorithm, the only problem is this line:
> (get (vec successors) (.indexOf result (apply max result)))
>
> It assumes that the initial ordering of moves ('successors') has been
> preserved throughout the recursion and so I can use .indexOf to go from the
> score back to the move that started it all! Is this the case? I am
> suspecting not! any suggestions?
>
> Thanks in advance,
>
>
> Jim
>
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