How to call a C++ function from R script inside a package (RCpp)?

Question

I have a cpp file with the function rcpp_hello_world(). I have an R script (also inside the Rcpp package). How do I call the rcpp_hello_world() function from the R script?

I've looked through Dirk's documentation ( http://dirk.eddelbuettel.com/code/rcpp/Rcpp-package.pdf ) but I don't see a part about calling the cpp function from an R script that's inside the package.

Obviously this is a simple example I'm using to learn how to interact with the two before I apply it to a much larger project.

Thanks!

Answer 1

After looking through http://people.math.aau.dk/~sorenh/teaching/2014-Rcpp/misc/Rcpp-workshop.pdf I found that I had seen the answer before but didn't realize it ( http://dirk.eddelbuettel.com/code/rcpp/Rcpp-package.pdf ).

To call rcpp_hello_world, in test1.R file, in package test the following is the syntax

test1 <- function(){
    .Call('test_rcpp_hello_world', PACKAGE = 'test')
} 

is the appropriate syntax. Additionally, it works out that the syntax for all functions (exported by Rcpp) can be found in RcppExports.cpp which is autogenerated on compilation.