#include <iostream>
#include <iterator>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>

enum Type { Wall, Empty };

auto constexpr wallChar = '1';
auto constexpr emptyChar = '9';

std::istream& operator>>(std::istream& in, Type& type)
{
    char c;
    if (in >> c) {
        if (c == wallChar) type = Wall;
        else if (c == emptyChar) type = Empty;
        else throw std::runtime_error(std::string("unknown type ") + c);
    }

    return in;
}

std::ostream& operator<<(std::ostream& out, Type const& type)
{
    return out << (type == Empty ? emptyChar : wallChar);
}

int main(int argc, const char * argv[])
{
    std::string file =
"1111\n"
"1991\n"
"1111";

    std::vector<std::vector<Type>> map;

    auto ssfile = std::stringstream(file); // instead use std::ifstream

    std::string line;
    while (std::getline(ssfile, line)) {
        std::vector<Type> row;

        auto ss = std::stringstream(line);

        std::copy(std::istream_iterator<Type>(ss), std::istream_iterator<Type>(), std::back_inserter(row));
        map.push_back(row);
    }


    std::cout << "the map has " << map.size() << " rows and " << map[0].size() << " columns" << std::endl;

    for (auto const& row : map) {
        for (auto const& x : row) {
            std::cout << x;
        }
        std::cout << std::endl;
    }

    return 0;
}