"No Rcpp::export attributes or RCPP_MODULE declarations found in source" with a extern

[haotianlin]

• #include <Rcpp.h>
• using namespace Rcpp;
• extern "C" double digamma(double);
• //[[Rcpp::export]]
• RcppExport SEXP updatealpha_u(SEXP alphaut,

This is the head of my code, and when I want to use sourceCpp("updatealpha_u.cpp") to make this function into global environment, it comes out with this error.

• sourceCpp("/Users/lehostal/Desktop/summer research/COMPASS_Extent/updatealpha_u.cpp")

• Warning message:
• In sourceCpp("/Users/lehostal/Desktop/summer research/COMPASS_Extent/updatealpha_u.cpp") :
• No Rcpp::export attributes or RCPP_MODULE declarations found in source

[jjallaire]

If I source the following file (on OS X) then I get no warnings or messages as you did:

#include <Rcpp.h>
using namespace Rcpp;
extern "C" double digamma(double);
//[[Rcpp::export]]
RcppExport SEXP updatealpha_u(SEXP alphaut) {
  return R_NilValue;
}

You might need to give us a more complete minimal reproducible example?

[eddelbuettel]

As @jjallaire showed, you simply had your ordering wrong.

It is also preferable to use the mailing list, or StackOverflow, for simple usage questions. And to include a minimally reproducible example.