I want a std::istream to be split using commas(,) and EOL(n) until a certain number of the mentioned delimiters are met and the result be stored inside std::vector<std::string> type and the rest of the std::istream be untouched.

std::vector<std::string> split_istream(std::istream &input, int num_separators) {
    std::vector<std::string> split_list;
    //Does the operation on input
    return split_list; // split list is the std::string segments separated by the delimiters
}

std::istream& another_function(std::istream &input) {
    auto vec = split_istream(input, 2); // 2 as an example
    input >> y; // defined before
}

In the above example : if the input is a,b,c , vec will be {a, b} and y as a result will be c. also if the input is a,b , vec will be {a, b} and in this case y will be waiting for new input.

Can this be done? and if so how?