Getting user input from R console: Rcpp and std::cin

I have been doing some exercises to learn c++ and decided to integrate them into R since ultimately I want to write c++ backends for R functions. I am having trouble finding a solution to retrieve user input from the R console. While there is Rcpp::Rcout for printing and returning output, there doesn't seem to be a similar funciton for std::cin....

#include <Rcpp.h>
// [[Rcpp::export]]
Rcpp::String cola() {
  Rcpp::Rcout << "Pick a drink:" << std::endl << "1 - Espresso" << std::endl << "2 - Americano" << std::endl << "3 - Latte" << std::endl << "4 - Cafe dopio" << 
std::endl << "5 - Tea" << std::endl;
  int drink;
  std::cin >> drink;
  std::string out;
  switch(drink) {
  case 1: out = "Here is your Espresso";
  case 2: out = "Here is your Americano";
  case 3: out = "Here is your Latte";
  case 4: out = "Here is your Cafe dopio";
  case 5: out = "Here is your Tea";
  case 0: out = "Error. Choice was not valid, here is your money back.";
    break;
  default:
    if(drink > 5) {out = "Error. Choice was not valid, here is your money back.";}
  }
  return out;
}