bkietz commented on code in PR #14241:
URL: https://github.com/apache/arrow/pull/14241#discussion_r980445728
##########
cpp/src/arrow/visit_type_inline.h:
##########
@@ -57,6 +57,33 @@ inline Status VisitTypeInline(const DataType& type, VISITOR*
visitor) {
#undef TYPE_VISIT_INLINE
+#define TYPE_VISIT_INLINE(TYPE_CLASS) \
+ case TYPE_CLASS##Type::type_id: \
+ return std::forward<VISITOR>(visitor)( \
+ internal::checked_cast<const TYPE_CLASS##Type&>(type));
+
+/// \brief Call `visitor` with the corresponding concrete type class
+///
+/// Unlike VisitTypeInline which calls `visitor.Visit`, here `visitor`
+/// itself is called.
+/// `visitor` must support a `const DataType&` argument as a fallback,
+/// in addition to concrete type classes.
+///
+/// The intent is for this to be called on a generic lambda
+/// that may internally use `if constexpr` or similar constructs.
+template <typename VISITOR>
+inline auto VisitType(const DataType& type, VISITOR&& visitor)
Review Comment:
LGTM
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