Function CGPDFContextSetParentTree 

pub unsafe extern "C-unwind" fn CGPDFContextSetParentTree(
    context: Option<&CGContext>,
    parent_tree_dictionary: CGPDFDictionaryRef,
)

Available on crate features CGContext and CGPDFContext and CGPDFDictionary only.

Safety

parent_tree_dictionary must be a valid pointer.