Method ForEach

cpp/src/arrow/util/reflection_internal.h:101–103

struct PropertyTuple {
  template <typename Fn>
  void ForEach(Fn&& fn) const {
    ForEachTupleMember(props_, fn);
  }

  static_assert(all_same<typename Properties::Class...>::value,
                "All properties must be properties of the same class");