Add casereader_create_append_numeric function.

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

diff --git a/src/data/casereader.h b/src/data/casereader.h
index ffbd17323ffc32274c69ce8c41f7598170a08d16..f7e885e64412d8ffbbe5b8e5258258109814d997 100644 (file)
--- a/src/data/casereader.h
+++ b/src/data/casereader.h
@@ -113,6 +113,14 @@ casereader_create_translator (struct casereader *, size_t output_value_cnt,
                               bool (*destroy) (void *aux),
                               void *aux);
 
+/* A function which creates a numberic value from an existing case */
+typedef double new_value_func (const struct ccase *, casenumber, void *);
+
+struct casereader *
+casereader_create_append_numeric (struct casereader *subreader,
+                                 new_value_func func, void *aux,
+                                 void (*destroy) (void *aux));
+
 struct casereader *
 casereader_create_arithmetic_sequence (struct casereader *,
                                        double first, double increment);