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1. forkThread_ :: Program τ α -> Program τ ()

   core-program	Core.Program.Threads

   Fork a thread with forkThread but do not wait for a result. This is on the assumption that the sub program will either be a side-effect and over quickly, or long-running daemon thread (presumably containing a forever loop in it), never returning.

2. forgetDisproof :: Decision a -> Maybe a

   decidable	Data.Type.Predicate

   Converts a Decision to a Maybe. Drop the witness of disproof of a, returning Just if Proved (with the proof) and Nothing if Disproved.

3. forgetProof :: Decision a -> Maybe (Refuted a)

   decidable	Data.Type.Predicate

   Drop the witness of proof of a, returning Nothing if Proved and Just if Disproved (with the disproof).

4. forM :: (Traversable t, Monad m) => t a -> (a -> m b) -> m (t b)

   distribution-opensuse	OpenSuse.Prelude

   forM is mapM with its arguments flipped. For a version that ignores the results see forM_.

5. forM_ :: (Foldable t, Monad m) => t a -> (a -> m b) -> m ()

   distribution-opensuse	OpenSuse.Prelude

   forM_ is mapM_ with its arguments flipped. For a version that doesn't ignore the results see forM. forM_ is just like for_, but specialised to monadic actions.

6. forever :: Applicative f => f a -> f b

   distribution-opensuse	OpenSuse.Prelude

   Repeat an action indefinitely.

   Examples

   A common use of forever is to process input from network sockets, Handles, and channels (e.g. MVar and Chan). For example, here is how we might implement an echo server, using forever both to listen for client connections on a network socket and to echo client input on client connection handles:

   echoServer :: Socket -> IO ()
   echoServer socket = forever $ do
   client <- accept socket
   forkFinally (echo client) (\_ -> hClose client)
   where
   echo :: Handle -> IO ()
   echo client = forever $
   hGetLine client >>= hPutStrLn client
   

   Note that "forever" isn't necessarily non-terminating. If the action is in a MonadPlus and short-circuits after some number of iterations. then forever actually returns mzero, effectively short-circuiting its caller.

7. forceRecomp :: Params cfgType a -> Bool

   dyre	Config.Dyre

   Should GHC be given the -fforce-recomp flag?

8. forceRecomp :: Params cfgType a -> Bool

   dyre	Config.Dyre.Params

   Should GHC be given the -fforce-recomp flag?

9. format :: Formattable a => a -> String

   epub-metadata	Codec.Epub.Format

   No documentation available.

10. formatGuide :: [GuideRef] -> String

    epub-metadata	Codec.Epub.Format.Guide

    Format an epub Guide structure for pretty printing

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