Re: [Rd] Calling do_inherit from C

[Prof Brian Ripley]

On Tue, 5 Apr 2005, Vadim Ogranovich wrote:
Hi,
Is there a way (or better say idiom) for calling functions like
do_inherit() (which are meant to be called via .Internal) from regular C
code. Say I have a SEXP object x and I want to check if it inherits from
"POSIXt". How do I do this?
Call eval() on the R expression you want.  There are lots of examples in 
the tests/Embedding directory, and the following (in objects.c)

#ifdef UNUSED
static void load_methods_package()
{
    SEXP e;
    R_set_standardGeneric_ptr(dispatchNonGeneric, NULL);
    PROTECT(e = allocVector(LANGSXP, 2));
    SETCAR(e, install("library"));
    SETCAR(CDR(e), install("methods"));
    eval(e, R_GlobalEnv);
    UNPROTECT(1);
}
#endif
is a simple prototype for such calls.
--
Brian D. Ripley,                  [EMAIL PROTECTED]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595
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