sort: New function sort_distinct_execute().

[pspp] / src / math / sort.h

diff --git a/src/math/sort.h b/src/math/sort.h
index 96ac32cc0b7a54a85e8297822b80ccfddbd40451..99395eb89eedfde6f134b10d7dd76380ee56a656 100644 (file)
--- a/src/math/sort.h
+++ b/src/math/sort.h
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 1997-9, 2000, 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1997-9, 2000, 2006, 2009, 2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -30,4 +30,19 @@ struct casereader *sort_execute (struct casereader *, const struct subcase *);
 struct casereader *sort_execute_1var (struct casereader *,
                                       const struct variable *);
 
+typedef struct ccase *sort_distinct_combine_func (struct ccase *first,
+                                                  struct ccase *second,
+                                                  void *aux);
+typedef void sort_distinct_destroy_func (void *aux);
+struct casewriter *sort_distinct_create_writer (const struct subcase *,
+                                                const struct caseproto *,
+                                                sort_distinct_combine_func *,
+                                                sort_distinct_destroy_func *,
+                                                void *aux);
+struct casereader *sort_distinct_execute (struct casereader *,
+                                          const struct subcase *,
+                                          sort_distinct_combine_func *,
+                                          sort_distinct_destroy_func *,
+                                          void *aux);
+
 #endif /* math/sort.h */