The type on "Ptr" doesn't actually affect what's inside; it's a convenience for programmers. The functions that do things with XEvents just read bytes from the Ptr's location. On Tue, Nov 6, 2018, 10:36 Guru Devanla <gurudev.devanla@gmail.com wrote:
Hello Haskell-Cafe,
I have been recently studying the XMonad code and some related types available in the X11 bindings library.
I came across this type:
newtype XEvent = XEvent XEventPtr
type XEventPtr = Ptr <http://hackage.haskell.org/package/base-4.10.1.0/docs/Foreign-Ptr.html#t:Ptr> XEvent <http://hackage.haskell.org/package/X11-1.9/docs/Graphics-X11-Xlib-Event.html#t:XEvent>
Available here:
http://hackage.haskell.org/package/X11-1.9/docs/Graphics-X11-Xlib-Event.html...
It seems that this type is circular here. how does one use this type? Is it possible to create a value out of this type? What is the use of this type?
Please could someone help me wrap my head around this?
Thanks
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