Please don't pick things out of context. It does not say .C() is deprecated and it is not talking about R code: it says
There are default variables and rules for this (determined when R is configured and recorded in R_HOME/etcR_ARCH/Makeconf), providing support for C, C++, FORTRAN 77, Fortran 9x, Objective C and Objective C++ with associated extensions .c, .cc or .cpp, .f, .f90 or .f95, .m, and .mm or .M, respectively. We recommend using .h for headers, also for C++ or Fortran 9x include files. (Use of .C for C++ is now deprecated and will be removed in R 2.12.0.)
You missed 'associated extensions', and that the NEWS file says
o Use of file extension .C for C++ code in packages is now deprecated: it has caused problems for some 'make's on case-insensitive file systems (although it currently works with the recommended toolkits).
On Wed, 21 Jul 2010, Florian Breitwieser wrote:
> I am writing a R package and having a bit of trouble to have the C++
> code working.
> I was planing using the .C interface function, however I found the
> comment (Use of ‘.C’ for C++ is now deprecated and will be removed in
> R 2.12.0.) in the R-exts manual.
> So this interface function should not be used anymore - .Call() or
> Rcpp instead? What is the reason for the deprecation?
> R-devel_at_r-project.org mailing list
-- Brian D. Ripley, ripley_at_stats.ox.ac.uk 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 272595Received on Wed 21 Jul 2010 - 13:21:44 GMT
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