cpp-dice-roller/simple_dice/main.cxx

//
//  main.cpp
//  dice-roll
//
//  Created by Sam Jaffe on 12/1/18.
//  Copyright © 2018 Sam Jaffe. All rights reserved.
//

#include <iostream>

#include "dice-roll/exception.h"

void eval(std::string const & str) {
  try {
    auto d = dice::from_string(str);
    auto rs = dice::roller()(d);
    std::cout << std::make_pair(d, rs) << '\n';
  } catch (dice::unexpected_token const & ut) {
    std::cerr << "Error in roll: '" << str << "': " << ut.what() << "\n";
    std::cerr << "                " << ut.pointer(str.size() + 1) << std::endl;
  }
}

int main(int, const char **) {
  std::string line;
  std::cout << "> ";
  while (std::getline(std::cin, line)) {
    eval(line);
    std::cout << "> ";
  }
  return 0;
}