Function MakeFirstN

cpp/src/arrow/util/iterator_test.cc:239–248

}

Transformer<TestInt, TestStr> MakeFirstN(int n) {
  int remaining = n;
  return [remaining](TestInt next) mutable -> Result<TransformFlow<TestStr>> {
    if (remaining > 0) {
      remaining--;
      return TransformYield(TestStr(next));
    }
    return TransformFinish();
  };
}

template <typename T>
Transformer<T, T> MakeFirstNGeneric(int n) {