[Rcpp-devel] Internals: how does DataFrame get initialized?

Dirk Eddelbuettel edd at debian.org
Wed Feb 29 13:56:38 CET 2012

On 29 February 2012 at 14:51, Darren Cook wrote:
| > It also includes "DataFrame_generated.h", which contains
| > automatically generated constructors with 1 to X (currently X=20)
| > "Named" arguments.
| Thanks. (your URL didn't give me permission, but I found it on my
| machine in /usr/local/lib/R/site-library/Rcpp/include/Rcpp )
| It does:
|   return DataFrame(
|     internal::try_catch(
|       ::Rcpp_lcons(
|         ::Rf_install( "data.frame"),
|         pairlist( t1, t2, t3, t4, t5 )
|   )));
| pairlist() appears to initialize a PairList object, which is a
| DottedPair object. (It derives from PairList, but does not seem to add
| anything?)
| DottedPair derives from RObject, but adds, er, functions. (Which Rcpp
| functionality is this adding? Why are these functions in their own class
| and not in RObject?)
| Finally RObject is the class that holds the SEXP.
| Last must-be-easy question of this email: where is RObject.cpp? Where is
| the RObject::setSEXP() function body?

Source files are in a directory src/ which is the usual place for R packages.

Headers are in inst/include/ as everything below inst/ will be included into
a binary R packages.

Hth, Dirk

"Outside of a dog, a book is a man's best friend. Inside of a dog, it is too
dark to read." -- Groucho Marx

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