R devel - Oct 2009 - R_CallMethodDef: 'type' and 'style' fields?

According to Writing R Extensions, the R_CallMethodDef struct has two
optional fields for specifying the 'type' and 'style' (where
'style' is said
to distinguish in/out/inout). But it gives no details of the possible values
of 'style'. And looking in the header file Rdynload.h the definition of
R_CallMethodDef does not include these two extra fields at all. (This is the
2.9.2 source)

Were these extra fields removed at some point? 




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In Writing R Extensions it is said that R_CallMethodDef has two optional
fields, 'type' and 'style' (where 'style' is said to
distinguish
in/out/inout arguments). But it doesn't give the possible values for
'style'. Looking at the header Rdynload.h (version 2.9.2) it appears
that
R_CallMethodDef  does not have these extra two fields. 

Were they removed at some point? If so, what is the best way to call a C
function without the overhead of copying the inputs?

Thanks
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