csv to token "1,2,3" => [1,2,3]

std::string input = "abc,def,ghi";
std::istringstream ss(input);
std::string token;

while(std::getline(ss, token, ',')) {
    std::cout << token << '\n';
}

source:

http://stackoverflow.com/questions/11719538/how-to-use-stringstream-to-separate-comma-separated-strings

std::strtok



http://en.cppreference.com/w/cpp/string/byte/strtokk