Function MakeDefaultRowAccessor

cpp/src/arrow/util/rows_to_batches.h:34–36

Default identity function row accessor. Used to for the common case where the value of each row iterated over is it's self also directly iterable.

// Default identity function row accessor. Used to for the common case where the value
// of each row iterated over is it's self also directly iterable.
[[nodiscard]] constexpr inline auto MakeDefaultRowAccessor() {
  return [](auto& x) -> Result<decltype(std::ref(x))> { return std::ref(x); };
}

// Meta-function to check if a type `T` is a range (iterable using `std::begin()` /
// `std::end()`). `is_range<T>::value` will be false if `T` is not a valid range.