always use rcpp export

Author: jjallaire

_posts/2012-12-19-sugar-for-high-level-vector-operations.md

@@ -21,6 +21,7 @@ third one:
 #include <Rcpp.h>
 using namespace Rcpp;
 
+// [[Rcpp::export]]
 NumericVector foo(NumericVector x, NumericVector y) {
    int n = x.size() ;
    NumericVector res( n ) ;
@@ -54,6 +55,7 @@ numeric and comparison operators yields the identical one-line
 implementation:
 
 {% highlight cpp %}
+// [[Rcpp::export]]
 NumericVector fooSugar(NumericVector x, NumericVector y) {
    return ifelse( x < y, x*x, -(y*y) );
 }

_posts/2012-12-20-simulating-pi.md

@@ -54,6 +54,7 @@ looks almost as compact.
 #include <Rcpp.h>
 using namespace Rcpp;
 
+// [[Rcpp::export]]
 double piSugar(const int N) {
   RNGScope scope;		// ensure RNG gets set/reset
   NumericVector x = runif(N);

src/2012-12-19-sugar-for-high-level-vector-operations.cpp

@@ -17,6 +17,7 @@
 #include <Rcpp.h>
 using namespace Rcpp;
 
+// [[Rcpp::export]]
 NumericVector foo(NumericVector x, NumericVector y) {
    int n = x.size() ;
    NumericVector res( n ) ;
@@ -50,6 +51,7 @@ foo <- function(x, y){
  * implementation:
  */
 
+// [[Rcpp::export]]
 NumericVector fooSugar(NumericVector x, NumericVector y) {
    return ifelse( x < y, x*x, -(y*y) );
 }

src/2012-12-20-simulating-pi.cpp

@@ -45,6 +45,7 @@ c(piR(1000), piR(10000), piR(100000), piR(1000000))
 #include <Rcpp.h>
 using namespace Rcpp;
 
+// [[Rcpp::export]]
 double piSugar(const int N) {
   RNGScope scope;		// ensure RNG gets set/reset
   NumericVector x = runif(N);