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c++ print vector without loop

template <typename T>
std::ostream& operator<< (std::ostream& out, const std::vector<T>& v) {
  if ( !v.empty() ) {
    out << '[';
    std::copy (v.begin(), v.end(), std::ostream_iterator<T>(out, ", "));
    out << "]";
  }
  return out;
}

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c++ print vector without loop

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