Function MakeFunctionIterator

cpp/src/arrow/util/iterator.h:369–371

template <typename Fn,
          typename Ret = typename internal::call_traits::return_type<Fn>::ValueType>
Iterator<Ret> MakeFunctionIterator(Fn fn) {
  return Iterator<Ret>(FunctionIterator<Fn, Ret>(std::move(fn)));
}

template <typename T>
Iterator<T> MakeEmptyIterator() {