Function PossiblySlowVectorIt

cpp/src/arrow/util/test_common.h:69–80

template <typename T>
inline Iterator<T> PossiblySlowVectorIt(std::vector<T> v, bool slow = false) {
  auto iterator = MakeVectorIterator<T>(std::move(v));
  if (slow) {
    return MakeTransformedIterator<T, T>(std::move(iterator),
                                         [](T item) -> Result<TransformFlow<T>> {
                                           SleepABit();
                                           return TransformYield(item);
                                         });
  } else {
    return iterator;
  }
}

template <typename T>
inline void AssertIteratorExhausted(Iterator<T>& it) {