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"

     ^      

Answer 1

Quick suggestion:

1. Move the header to inst/include/testr.h ;
2. This requires a src/Makevars entry such as PKG_CPPFLAGS = -I../inst/include to have the compilation look there.
3. 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 eg BH and various Rcpp* packages.