[Haskell-cafe] mapM for vectors

[Khudyakov Alexey]

Hello

I found that there is no monadic map for vector. It's possible to define to 
define such map using conversion to list, but I suppose it's not efficient. I 
didn't make any measurements.

> mapM' :: Monad m => (a -> m b) -> V.Vector a -> m (V.Vector b)
> mapM' f = return . V.fromList <=< mapM f . V.toList

Any suggestions about implementation of such function? 
Specifically I want to use Random monad.

--
  Khudyakov Alexey