[cairo] cairo_surface_*_user_data in language bindings

[Daniel Keep]

Hi there.

I'm currently working on a D (http://www.digitalmars.com/d/) language
binding for cairo, and wanted to ask a question about the
get/set_user_data functions.

Basically: are these ever *required* for use of the api?  For example,
does one of the backends ask the programmer to place extra information
in a surface using these functions?

If the answer is "no", then I can cheat and just implement them using
hashes and boxes (which also means I don't have to worry about the GC) :)

Thanks,

	-- Daniel

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