Rcpp 0.7.4

January 31, 2010
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(This article was first published on dirk.eddelbuettel, and kindly contributed to R-bloggers)

Yesterday, and about nine days after release 0.7.3 of Rcpp (a set of R / C++ interface classes), Romain and I released version 0.7.4. It has been uploaded to CRAN and Debian, and mirrors should already have new versions. As before, my local page is also available for downloads and some more details.

The release once again combines a number of necessary fixes with numerous new features:

  • Building on OS X did not support multi-arch, and we are grateful for Simon who once again came to the rescue. Things should be fine now. The big take-away is that under no circumstances, include either a file configure or src/Makefile if you want multi-arch builds for free. As Rcpp is effectively a library to be used by other packages, this mattered.
  • We added a file NEWS from which I include the relevant section below.
  • Much more code re-organisation and enhancement making passage of various C++ types even easier -- see the NEWS entry below.
  • More unit tests, now including ones for the 'old Rcpp API'.
Post-release, I also reworked the doxygen setup slightly so that all examples are now browseable, and the whole documentation is now searchable as well.

Lastly, we had a remaining Windows build issue. Also, Brian Ripley and Uwe Ligges kindly sent us a small patch supporting the new Windows 64-bit builds using the new MinGW 64-bit compiler for Windows -- so release 0.7.5 may follow in due course.

The NEWS file entry for release 0.7.4 is as follows:

0.7.4	2010-01-30 o	matrix matrix-like indexing using operator() for all vector types : IntegerVector, NumericVector, RawVector, CharacterVector LogicalVector, GenericVector and ExpressionVector. o	new class Rcpp::Dimension to support creation of vectors with dimensions. All vector classes gain a constructor taking a Dimension reference. o	an intermediate template class "SimpleVector" has been added. All simple vector classes are now generated from the SimpleVector template : IntegerVector, NumericVector, RawVector, CharacterVector LogicalVector. o	an intermediate template class "SEXP_Vector" has been added to generate GenericVector and ExpressionVector. o	the clone template function was introduced to explicitely clone an RObject by duplicating the SEXP it encapsulates. o	even smarter wrap programming using traits and template meta-programming using a private header to be include only RcppCommon.h o the as template is now smarter. The template now attempts to build an object of the requested template parameter T by using the constructor for the type taking a SEXP. This allows third party code to create a class Foo with a constructor Foo(SEXP) to have as for free. o	wrap becomes a template. For an object of type T, wrap uses implicit conversion to SEXP to first convert the object to a SEXP and then uses the wrap(SEXP) function. This allows third party code creating a class Bar with an operator SEXP() to have wrap for free. o	all specializations of wrap : wrap , wrap< vector > use coercion to deal with missing values (NA) appropriately. o	configure has been withdrawn. C++0x features can now be activated by setting the RCPP_CXX0X environment variable to "yes". o	new template r_cast to facilitate conversion of one SEXP type to another. This is mostly intended for internal use and is used on all vector classes o	Environment now takes advantage of the augmented smartness of as and wrap templates. If as makes sense, one can directly extract a Foo from the environment. If wrap makes sense then one can insert a Bar directly into the environment. Foo foo = env["x"] ; /* as is used */ Bar bar ; env["y"] = bar ; /* wrap is used */ o	Environment::assign becomes a template and also uses wrap to create a suitable SEXP o	Many more unit tests for the new features; also added unit tests for older API

As always, even fuller details are in the ChangeLog on the Rcpp page which also leads to the downloads, the browseable doxygen docs and zip files of doxygen output for the standard formats. Questions, comments etc should go to the rcpp-devel mailing list off the R-Forge page

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