Function MakeRepeatN

cpp/src/arrow/util/iterator_test.cc:321–332

template <typename T>
Transformer<T, T> MakeRepeatN(int repeat_count) {
  int current_repeat = 0;
  return [repeat_count, current_repeat](T next) mutable -> Result<TransformFlow<T>> {
    current_repeat++;
    bool ready_for_next = false;
    if (current_repeat == repeat_count) {
      current_repeat = 0;
      ready_for_next = true;
    }
    return TransformYield(next, ready_for_next);
  };
}

TEST(TestIteratorTransform, Repeating) {
  auto original = VectorIt({1, 2, 3});