Method GetType

cpp/src/arrow/type.cc:1620–1626

  template <typename T>
  static const DataType* GetType(const T& input) {
    if constexpr (std::is_same_v<T, ArrayData>) {
      return input.type.get();
    } else {
      return input.type().get();
    }
  }
};

// Utility class for retrieving a child field/column from a top-level Field, Array,