[Xcb] How to associate user/misc pointer with an xcb_window_t

[Sam Varshavchik]

I am going through xcb's developer documentation. I'm looking for a way to  
associate a generic miscellaneous pointer with a window, specifically an  
xcb_window_t.

It's a common design paradigm with UI libraries: a way to stash some  
generic/miscellaneous pointer to application-specific data, associating it  
with the UI library's resource, such as a window. The application can  
subsequently retrieve it, when it wants to find the application-specific  
data that's associated with the window.

So, for example, if I get an xcb_expose_event_t, I can take the referenced  
xcb_window_t, retrieve the application data, and know what to do with this  
window.


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