[Haskell-cafe] FunPtr error?

[Galchin, Vasili]

Thanks. Clause?

regards, Vasili

On Mon, Jun 9, 2008 at 12:54 AM, Bulat Ziganshin <bulat.ziganshin at gmail.com>
wrote:

> Hello Vasili,
>
> Monday, June 9, 2008, 6:17:14 AM, you wrote:
>
> 1. standard place to import FunPtr from is Foreign.Ptr, not System.Posix
> 2. FunPtr is exported as abstract type, without constructors. you
> can't construct values of this type directly. instead you should use
> "wrapper" generators as in the example that Clause has wrote. read it
> carefully :)
>
>
> > Hello,
>
> >      I am getting what is to me a mysterious error in a test case that I
> am writing:
> > vigalchin at ubuntu:~/FTP/Haskell/unix-2.2.0.0/tests/timer$ runhaskell
> Setup.lhs build
> > Preprocessing executables for Test-1.0...
> >  Building Test-1.0...
> > [1 of 1] Compiling Main             ( ./timer.hs,
> > dist/build/timer/timer-tmp/Main.o )
>
> > ./timer.hs:11:45: Not in scope: data constructor `FunPtr'
>
> > It seems like the compiler is complaining about the lack of FunPtr
> > in it's symbol table but System.Posix is imported:
> >
> > module Main where
>
> > import System.Posix
> > import Foreign
> > import Foreign.C
> > import Foreign.Ptr
>
> > main = do
>
> >          let event = Sigevent{sigevFunction=(FunPtr (notifyFunc))}
> <<<<<< error here
> >
> >          timerId <- timerCreate Clock_Realtime Nothing
>
> >          timerDelete timerId
>
> >          return ()
>
> > notifyFunc :: Sigval -> IO ()
> > notifyFunc sigval = do
> >    putStrLn "timer POP!!!!!!!"
> >     return ()
>
> > I am probably looking right at the answer and not seeing it. ??
>
> > Thanks, Vasili
>
>
>
> >
>
>
> --
> Best regards,
>  Bulat                            mailto:Bulat.Ziganshin at gmail.com
>
>
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