[vector] #87: Add a varient of unfoldrN

[vector]

#87: Add a varient of unfoldrN
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Reporter:  tommd        |       Owner:     
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:     
 Version:               |    Keywords:     
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 I suggest we either add a variant of unfoldrN or make an API-breaking
 change to the current one.  The variant (placeholder name for now) would
 have a signature:

     unfoldrN' :: Storable a => Int -> (b -> Maybe (a, b)) -> b -> (Vector
 a,b)

 In otherwords, we provide the resulting type `b` after applying the
 function N time (or fewer, if it returns Nothing).

-- 
Ticket URL: <http://trac.haskell.org/vector/ticket/87>
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