Function copy

extlibs/fmt/include/fmt/ranges.h:60–64

template <typename RangeT, typename OutputIterator>
OutputIterator copy(const RangeT& range, OutputIterator out) {
  for (auto it = range.begin(), end = range.end(); it != end; ++it)
    *out++ = *it;
  return out;
}

template <typename OutputIterator>
OutputIterator copy(const char* str, OutputIterator out) {