On 6 October 2016 at 12:19, Avraham Adler wrote:
| Has anyone successfully created a package that uses Rcpp for C++ code
| and which also has Fortran code? I'm experimenting with comparing
| Fortran and C++ and if I could use Rcpp to handle the C++ portion, it
| would reduce the steepness of the learning curve.
|
| However, I haven't had success. The following C++ and Fortran snippets
| compile properly separately—the C++ as part of Rcpp and the Fortran
| using R CMD SHLIB and dynload—and the R snippets call them properly,
| but when I put both the .cpp and .f95 files in /src, I get the huge
| error posted below the files.
|
| Am I missing something simple or will having C++ and Fortran code in
| the same package prevent the use of Rcpp and require the old methods
| of calling compiled code?
I was about to say 'sure, why not' when I remembered that Writiing R
Extension has something to say about this in section 1.2.4:
There is no guarantee that C++11 can be used in a package in
combination with any other compiled language (even C), as the C++11
compiler may be incompatible with the native compilers for the platform.
(There are known problems mixing C++11 with Fortran.)
but then this warning is just about C++11 and Fortran.
That said, your description above suggests that you are "simply" too
optimistic about 'Rcpp Attributes' -- those do not aim to support all
languages. They provide a (very powerful) convenience tool for Rcpp. And
hence C++.
If it works in a package, stick with a package. That gets you different
compilation units, and hopefully sane linking.
Dirk
--
http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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