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\alias{CairoUserDataKey}
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\description{Generic data types}
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\section{Detailed Description}{Generic data types used in the cairo API}
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\section{Structures}{\describe{\item{\verb{CairoUserDataKey}}{
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\verb{\link{CairoUserDataKey}} is used for attaching user data to cairo
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data structures. The actual contents of the struct is never used,
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and there is no need to initialize the object; only the unique
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a \verb{cairo_data_key_t} object is used. Typically, you
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would just use the a static \verb{cairo_data_key_t} object.
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\describe{\item{\code{unused}}{[integer] not used; ignore.}}
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\references{\url{http://www.cairographics.org/manual/cairo-Types.html}}
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\author{Derived by RGtkGen from GTK+ documentation}