Insertion overloading in c++

//<<<<<<<<<<<<<<<<<<<<<<<<<<<insertion operator overloading<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Amir Ammar
std::ostream& operator<<(std::ostream& out, const Bigint& i){
  for(auto b = i.m_digits.begin(); b != i.m_digits.end(); ++b){
    out<<(*b);
  }
  return (out);
}

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