Declare sub_refcnt field
diff --git a/include/grpc/impl/codegen/slice.h b/include/grpc/impl/codegen/slice.h
index fbd18e6..45902c6 100644
--- a/include/grpc/impl/codegen/slice.h
+++ b/include/grpc/impl/codegen/slice.h
@@ -68,6 +68,11 @@
grpc_slice_new, or grpc_slice_new_with_len instead. */
typedef struct grpc_slice_refcount {
const grpc_slice_refcount_vtable *vtable;
+ /* If a subset of this slice is taken, use this pointer for the refcount.
+ Typically points back to the refcount itself, however iterning
+ implementations can use this to avoid a verification step on each hash
+ or equality check */
+ struct grpc_slice_refcount *sub_refcount;
} grpc_slice_refcount;
#define GRPC_SLICE_INLINED_SIZE (sizeof(size_t) + sizeof(uint8_t *) - 1)