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Within LTS Haskell 24.34 (ghc-9.10.3)

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  1. forall_ :: LaTeXC l => l

    HaTeX Text.LaTeX.Base.Math

    For all symbol, <math>.

  2. forall_ :: LaTeXC l => l

    HaTeX Text.LaTeX.Packages.AMSMath

    For all symbol, <math>.

  3. foreignlanguage :: LaTeXC l => Language -> l -> l

    HaTeX Text.LaTeX.Packages.Babel

    The function foreignlanguage takes two arguments; the second argument is a phrase to be typeset according to the rules of the language named in its first argument.

  4. forceShutdown :: FrontendSession -> IO ()

    LambdaHack Game.LambdaHack.Client.UI.Frontend.Sdl

    No documentation available.

  5. forkChild :: MVar [Async ()] -> IO () -> IO ()

    LambdaHack Game.LambdaHack.Common.Thread

    No documentation available.

  6. forApplyEffect :: Effect -> Bool

    LambdaHack Game.LambdaHack.Content.ItemKind

    Whether the effect has a chance of exhibiting any potentially noticeable behaviour, except when the item is destroyed or combined. We assume at least one of OneOf effects must be noticeable.

  7. forDamageEffect :: Effect -> Bool

    LambdaHack Game.LambdaHack.Content.ItemKind

    Whether a non-nested effect always applies raw damage.

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

    LambdaHack Game.LambdaHack.Core.Prelude

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

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

    LambdaHack Game.LambdaHack.Core.Prelude

    This has a more specific type (unit result) than normally, to catch errors.

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

    LambdaHack Game.LambdaHack.Core.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.

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