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

diff --git a/src/data/casefilter.h b/src/data/casefilter.h
index 00fac3bb12763be073d4f6edbe9cd4b15f012866..083322ee58935d5f3025c11ec9c182717af2266d 100644 (file)
--- a/src/data/casefilter.h
+++ b/src/data/casefilter.h
@@ -1,6 +1,5 @@
 /* PSPP - computes sample statistics.
    Copyright (C) 2006 Free Software Foundation, Inc.
-   Written by John Darrington <john@darrington.wattle.id.au>
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
@@ -21,22 +20,24 @@
 #define casefilter_h 1
 
 #include <stdbool.h>
+#include <data/missing-values.h>
 
 struct ccase;
 struct casefilter;
 struct variable ;
 
-/* Create a new casefilter.
-   If EXCL is true, then the filter  user missing values to be missing, 
-   otherwise they are considered at their face value.
+/* Create a new casefilter that drops cases in which any of the
+   N_VARS variables in VARS are missing in the given CLASS.
    VARS is an array of variables which if *any* of them are missing.
    N_VARS is the size of VARS.
  */
-struct casefilter * casefilter_create (bool, struct variable **, int);
+struct casefilter * casefilter_create (enum mv_class class,
+                                       struct variable **, int);
 
 /* Add the variables in VARS to the list of variables for which the
    filter considers. N_VARS is the size of VARS */
-void casefilter_add_variables (struct casefilter *, struct variable **, int);
+void casefilter_add_variables (struct casefilter *, 
+                              struct variable *const*, int);
 
 /* Destroy the filter FILTER */
 void casefilter_destroy (struct casefilter *); 
@@ -44,7 +45,10 @@ void casefilter_destroy (struct casefilter *);
 /* Returns true iff the entire case should be skipped */
 bool casefilter_skip_case (const struct casefilter *, const struct ccase *);
 
-/* Returns true iff the variable V in case C is missing */
+/* Returns true iff the variable V in case C is missing.
+   Note that this function's behaviour is independent of the set of 
+   variables  contained by the filter.
+ */
 bool casefilter_variable_missing (const struct casefilter *f, 
                                   const struct ccase *c, 
                                   const struct variable *v);