Method Next

cpp/src/arrow/util/async_generator_test.cc:1253–1259

struct SlowEmptyIterator {
  Result<TestInt> Next() {
    if (called_) {
      return Status::Invalid("Should not have been called twice");
    }
    SleepFor(0.1);
    return IterationTraits<TestInt>::End();
  }

 private:
  bool called_ = false;