X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmath%2Finteraction.h;h=ec6f88b03b6dc06571a9413d73843b1bfbea97df;hb=259b5c32c06fd93964720f4a0e7844b5a24c55db;hp=bc1e63a42e92777e3d6f79e3a81a59996b1388c2;hpb=a1efcf97ca2f75f4be6a0389ff2372c03ed2d4e1;p=pspp

diff --git a/src/math/interaction.h b/src/math/interaction.h
index bc1e63a42e..ec6f88b03b 100644
--- a/src/math/interaction.h
+++ b/src/math/interaction.h
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2009 Free Software Foundation, Inc.
+   Copyright (C) 2011 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
@@ -14,15 +14,58 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
-#ifndef INTERACTION_H
-#define INTERACTION_H
-struct interaction_variable;
-struct interaction_value;
 
-struct interaction_variable * interaction_variable_create (const struct variable **, int);
-void interaction_variable_destroy (struct interaction_variable *);
-struct interaction_value * interaction_value_create (const struct interaction_variable *, const union value **);
-void interaction_value_destroy (struct interaction_value *);
-size_t interaction_variable_get_n_vars (const struct interaction_variable *);
+#ifndef _INTERACTION_H__
+#define _INTERACTION_H__ 1
+
+#include <stdbool.h>
+#include "data/missing-values.h"
+
+struct ccase;
+struct interaction;
+struct string;
+struct variable;
+
+#include <stddef.h>
+
+/* An interaction is a structure containing a "product" of other variables.
+   The variables can be either string or numeric.
+
+   Interaction is commutative.  That means, that from a mathematical point of
+   view, the order of the variables is irrelevant.  However, for display
+   purposes, and for matching with an interaction's value the order is
+   pertinent.  Therefore, when using these functions, make sure the orders of
+   variables and values match when appropriate.
+
+   Some functions for interactions will not work properly for interactions that
+   contain a given variable more than once, so this should be regarded as an
+   invariant.  The functions to modify interactions don't check for this
+   invariant. */
+struct interaction
+  {
+    const struct variable **vars;
+    size_t n_vars;
+  };
+
+struct interaction *interaction_create (const struct variable *);
+struct interaction *interaction_clone (const struct interaction *);
+void interaction_destroy (struct interaction *);
+void interaction_add_variable (struct interaction *, const struct variable *);
+void interaction_dump (const struct interaction *);
+void interaction_to_string (const struct interaction *, struct string *str);
+bool interaction_is_proper_subset (const struct interaction *,
+                                   const struct interaction *);
+bool interaction_is_subset (const struct interaction *,
+                            const struct interaction *);
+
+
+unsigned int interaction_case_hash (const struct interaction *,
+                                    const struct ccase *, unsigned int base);
+bool interaction_case_equal (const struct interaction *, const struct ccase *,
+                             const struct ccase *);
+bool interaction_case_is_missing (const struct interaction *,
+                                  const struct ccase *, enum mv_class);
+int interaction_case_cmp_3way (const struct interaction *,
+                               const struct ccase *, const struct ccase *);
 
 #endif