numeric-prelude-0.0.2: src/NumericPrelude/Monad.hs

module NumericPrelude.Monad where

{- | repeat action until result fulfills condition -}
untilM :: (Monad m) => (a -> Bool) -> m a -> m a
untilM p m =
   do x <- m
      if p x
        then return x
        else untilM p m