Rcpp: Include header from package into cppFunction

Question

I have a package that uses Rcpp. It has different C++ function defined int src/testr.h. Now at some point I need to generate Rcpp functions (using cppFunction or cxxfunction) that use things defined in src/testr.h. How can I do that?

I tried,

> cxxfunction(signature(x="list") includes = c('#include "testr.h"'), body=sprintf(template, name, name))
> Rcpp::cppFunction(depends = "testr", includes = c('#include "src/testr.h"'), sprintf(template, name, name))

But

file7086270f0da.cpp:7:10: fatal error: 'testr.h' file not found
#include "testr.h"

     ^

Dirk is no longer here · Accepted Answer · 2015-03-05 18:11:04Z

4

Quick suggestion:

Move the header to inst/include/testr.h;
This requires a src/Makevars entry such as PKG_CPPFLAGS = -I../inst/include to have the compilation look there.
Now with the package installed as, say, mypkg, you can add a depends="mypkg" and R will know to set a -I... for you.

We use the same trick all the time in e.g. BH and various Rcpp* packages.

answered Mar 5, 2015 at 18:11

Dirk is no longer here

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3 Comments

romants Over a year ago

Thanks for a suggestion. I moved the header as you proposed, but I guess because the implementation of a functions from header is still in src/testr.cpp, I get following errors like Symbol not found: __Z7deparseP7SEXPREC. @dirk-eddelbuettel, do you know how can that be fixed?

Dirk is no longer here Over a year ago

What I suggested assumed a header-only approach (as that was also what the subject of your question suggested). When you want to import functions from another package and need linking, then a more involved approach is needed.

Dirk is no longer here Over a year ago

The "Writing R Extensions" manual that came with R. No easy Rcpp wrapper, but you can eg look at how RApiSerialize provides a function for RcppRedis, or how xts provides some functions for RcppXts. By far the easiest is to convert your code to be header-only if you can.

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