[Rcpp-devel] Using printf: Error in source("/tmp/printf.r") : /tmp/printf.r:8:11: unexpected input

Dear Rcpp folks,


could you please give me a hint on how to use `printf`.

         library(inline)
         inc<- "
         #include<stdio.h>
         "

         drucken<-cxxfunction(includes=inc, plugin="Rcpp", body="
           unsigned int length = 1;
           printf("%u\\n", length);

           return wrap(length);
         ")

throws the following error, when I try to source it.

         >  source("/tmp/printf.r")

         Error in source("/tmp/printf.r") : /tmp/printf.r:8:11: unexpected input
         7:   unsigned int length = 1;
         8:   printf("%u\\n", length);

Removing the `printf` statement gets rid of the error. I tested the
standalone example and `gcc` does not complain.

         /* printf example */
         #include<stdio.h>

         int main()
         {
           unsigned int length = 1;
           printf("%u \n", length);

           return length;
         }

Probably my mistake is a simple one because

source("/usr/lib/R/site-library/Rcpp/examples/RcppInline/RcppInlineWithLibsExamples.r")

works and `printf` statements are used in there. (I had to install
`libgsl0-dev` to get the headers.)


Thanks,

Paul