[Haskell-cafe] FFI woes!

David Roundy droundy at abridgegame.org
Wed Dec 15 06:04:37 EST 2004

On Wed, Dec 15, 2004 at 04:09:04AM +0100, Sebastian Sylvan wrote:
> const char *name
> );
> By doing this in Haskell:
> data MusicModule = MusicModule
> foreign import ccall "fmod.h FMUSIC_LoadSong" fmusic_LoadSong ::
> CString -> IO ForeignPtr MusicModule)
> I assume that this is how the ForeignPtr is meant to be used (with a
> dummy data type).

No, a ForeignPtr is a purely haskell object.  The C function returns a
Ptr.  You could create a ForeignPtr from the Ptr if you want it to be
automatically freed (calling somesort of FreeSong, presumably) when it gets
garbage collected.
David Roundy

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