Generic data types
Generic data types used in the cairo API
CairoUserDataKey is used for attaching user data to cairo
data structures. The actual contents of the struct is never used,
and there is no need to initialize the object; only the unique
cairo_data_key_t object is used. Typically, you
would just use the a static
[integer] not used; ignore.
cairo_destroy_func_t the type of function which is called when a
data element is destroyed. It is passed the pointer to the data
element and should free any memory and resources allocated for it.
[R object] The data element being destroyed.
Derived by RGtkGen from GTK+ documentation
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