Added some error checking to casereader_create_append_rank

[pspp-builds.git] / src / data / casereader.h

diff --git a/src/data/casereader.h b/src/data/casereader.h
index a2d9403bb03bce10ede5a638f459261889d373ad..3df80cb08fb8d38acc302e0654a0217dd666287a 100644 (file)
--- a/src/data/casereader.h
+++ b/src/data/casereader.h
@@ -125,12 +125,20 @@ struct casereader *
 casereader_create_arithmetic_sequence (struct casereader *,
                                        double first, double increment);
 
+enum rank_error
+  {
+    RANK_ERR_NONE = 0,
+    RANK_ERR_NEGATIVE_WEIGHT = 0x01,
+    RANK_ERR_UNSORTED = 0x02
+  };
+
 
 typedef void distinct_func (double v, casenumber n, double w, void *aux);
 
 struct casereader *
 casereader_create_append_rank (struct casereader *,
                               const struct variable *v, const struct variable *w,
+                              enum rank_error *err,
                               distinct_func *distinct_callback, void *aux);