insertion and extraction operator overloading in c 2b 2b

1//<<<<<<<<<<<<<<<<<<<<<<<<<<<insertion operator overloading<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Amir Ammar
2std::ostream& operator<<(std::ostream& out, const Bigint& i){
3  for(auto b = i.m_digits.begin(); b != i.m_digits.end(); ++b){
4    out<<(*b);
5  }
6  return (out);
7}
8//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>extraction operator overloading>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Efi Fogel
9std::istream& operator>>(std::istream& in, Bigint& i) {
10  char c;
11  in.get(c);
12  if (c == '-') i.m_is_negative = true;
13  else {
14    if (! std::isdigit(c)) throw std::runtime_error("Invalid input");
15    i.m_digits.emplace_front(c);
16  }
17  while (in.get(c) && (c != 0xa)) {
18    if (! std::isdigit(c)) throw std::runtime_error("Invalid input");
19    i.m_digits.emplace_front(c);
20  }
21  i.m_digits.reverse(); // additional method to return the reversed value (the real input)
22  while(i.m_digits.front()=='0'&&i.m_digits.size()!= 1){ // while loop to earse additional zeroes 
23    i.m_digits.pop_front();
24    if(i.m_digits.size()== 1)
25      break;
26  }
27  return in;
28}