I'm interfacing a c++ library which assumes strings are UTF-8. However
strings from R can have various encodings. It's not clear to me how I
need to account for that in Rcpp. For example:
// [[Rcpp::export]]
std::string echo(std::string src){
return src;
}
This program does not work on windows for non-ascii strings:
> test = "東京"
> echo(test)
[1] "æ ±äº¬
In C programs I always use translateCharUTF8 on all input to make sure
it is UTF8 before I start working with it:
translateCharUTF8(STRING_ELT(x, i));
Similarly on the output, I explicitly set the encoding to let R know
it this is UTF8:
SET_STRING_ELT(out, 0, mkCharCE(olds, CE_UTF8));
This ensures that code works across platforms and locales. How do we
go about this in Rcpp?
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