[Haskell-beginners] qtHaskell, ForeignPtr

[Michael Mossey]

I'm trying to learn qtHaskell, an interface to the Qt GUI library. I am
fairly new to Haskell, but have used Qt for a long time, so I thought I
could probably reasonably attempt to grok qtHaskell at this point.

My main question is: anyone recommended a good explanation of the foreign
function or foreign pointer interface?

My immediate question is that I was poking through the Qtc docs, and saw
this:


Documentation

   data Object a

Constructors

   QObject !(ForeignPtr a)

I am not sure how Haddock works. Is this telling me that an Object
constructor takes one argument, which is of type QObject, where QObject is
a type constructor that takes !(ForeignPtr a)? Or is this saying it takes
two arguments, a QObject and a !(ForeignPtr a). That latter makes more
sense I guess. What does the ! mean?

Thanks,
Mike