pitrou commented on code in PR #47994:
URL: https://github.com/apache/arrow/pull/47994#discussion_r2793336007


##########
cpp/src/arrow/util/bpacking.cc:
##########
@@ -50,19 +51,19 @@ struct UnpackDynamicFunction {
 }  // namespace
 
 template <typename Uint>
-void unpack(const uint8_t* in, Uint* out, int batch_size, int num_bits, int 
bit_offset) {
+void unpack(const uint8_t* in, Uint* out, const UnpackOptions& opts) {
 #if defined(ARROW_HAVE_NEON)
-  return unpack_neon(in, out, batch_size, num_bits, bit_offset);
+  return bpacking::unpack_neon(in, out, opts);
 #else
   static DynamicDispatch<UnpackDynamicFunction<Uint> > dispatch;
-  return dispatch.func(in, out, batch_size, num_bits, bit_offset);
+  return dispatch.func(in, out, opts);
 #endif
 }
 
-template void unpack<bool>(const uint8_t*, bool*, int, int, int);
-template void unpack<uint8_t>(const uint8_t*, uint8_t*, int, int, int);
-template void unpack<uint16_t>(const uint8_t*, uint16_t*, int, int, int);
-template void unpack<uint32_t>(const uint8_t*, uint32_t*, int, int, int);
-template void unpack<uint64_t>(const uint8_t*, uint64_t*, int, int, int);
+template void unpack<bool>(const uint8_t*, bool*, const UnpackOptions&);

Review Comment:
   Kind of, though we might want to revisit later anyway. Not necessary for 
this PR in any case!



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