cannot compile rinside with armadillo examples - c++

Question

I am trying to compile the Rarmadillo example with Rinside and I keep getting:
In file included from rinside_arma0.cpp:8:0:
/usr/local64/opt/R-2.15.2/lib/R/library/RcppArmadillo/include/RcppArmadillo.h:26:6: error: #error "The file 'Rcpp.h' should not be included. Please correct to include only 'RcppArmadillo.h'."
I googled it but I keep getting the source code per se. Any ideas ?
The code is :
// -*- c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Simple example using Armadillo classes
//
// Copyright (C) 2012 Dirk Eddelbuettel and Romain Francois
#include <RInside.h> // for the embedded R via RInside
#include <RcppArmadillo.h>
int main(int argc, char *argv[]) {
RInside R(argc, argv); // create an embedded R instance
std::string cmd = "diag(3)"; // create a Matrix in r
arma::mat m = Rcpp::as<arma::mat>(R.parseEval(cmd)); // parse, eval + return result
std::cout << m << std::endl; // and use Armadillo i/o
exit(0);
}
and compiled it using:
g++ -I/usr/local64/opt/R-2.15.2/lib/R/include -I/usr/local64/opt/R-2.15.2/lib/R/library/Rcpp/include -I"/usr/local64/opt/R-2.15.2/lib/R/library/RcppArmadillo/include" -I/usr/local64/opt/R-2.15.2/lib/R/library/RInside/include -g -O2 -Wall -I/usr/local/include rinside_arma0.cpp -L/usr/local64/opt/R-2.15.2/lib/R/lib -lR -lf77blas -latlas -llapack -L/usr/local64/opt/R-2.15.2/lib/R/library/Rcpp/lib -lRcpp -Wl,-rpath,/usr/local64/opt/R-2.15.2/lib/R/library/Rcpp/lib -L/usr/local64/opt/R-2.15.2/lib/R/library/RInside/lib -lRInside -Wl,-rpath,/usr/local64/opt/R-2.15.2/lib/R/library/RInside/lib -o rinside_arma0

Answer 1

The error you get is because Rcpp.h is included before RcppArmadillo.h, Rcpp.h is included by RInside.h.
For the magic that RcppArmadillo gives you, the file RcppArmadillo.h needs to be loaded before Rcpp.h. So I suggest you do this:
#include <RcppArmadillo.h>
#include <RInside.h>