In article <[EMAIL PROTECTED]>, Alastair Reid <[EMAIL PROTECTED]> wrote:
> It looks like you're using an idiom we didn't think of when designing the > library. Can you explain what you're trying to do and whether you think we > shoud provide direct support for newSimpleForeignPtr (which I'd be tempted to > call newForeignPtr_). Specifically I want a ForeignPtr of a null Ptr that has no finalizers. I want a value of type ForeignPtr such that withForeignPtr will extract a null Ptr. My basic JNI ref type is newtype of a ForeignPtr. JNI gives me "global references" as Ptrs, and I wrap them in ForeignPtrs with a finalizer that tells the Java VM I'm finished with it. When I want to pass such a ref back to JNI, I simply call withForeignPtr to extract the underlying Ptr. But sometimes I want to create my own null references. Before GHC 6.0, I used to call (newForeignPtr nullPtr (return ())), and that would give me a ForeignPtr that would work with withForeignPtr to give a null Ptr. But now I can't. -- Ashley Yakeley, Seattle WA _______________________________________________ FFI mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/ffi
