Hidden Rcpp functions

gistfile1.txt

To make a function written in Rcpp hidden, add the following 'name; attribute to the export header line with a period prefix 

// [[Rcpp::export(name=".ngram_generator")]]
std::vector<std::string> ngram_generator(std::string sentence, unsigned int n){
	std::istringstream iss(sentence);
	std::vector<std::string> tokens;
	std::vector<std::string> bigrams;
	std::string str;

	copy(std::istream_iterator<std::string>(iss),
		std::istream_iterator<std::string>(),
		back_inserter(tokens));

	for (unsigned int i = n; i <= tokens.size(); ++i){
		str = tokens[i - n];
		for (unsigned int j = i - n + 1; j < i; j++){ str = str + ' ' + tokens[j]; }
		bigrams.push_back(str);
	}

	return(bigrams);
}