From 75e7e4241ba2424c3803548bcf2da0382faf7349 Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Fri, 9 Dec 2011 11:24:56 +0100
Subject: [PATCH] Added a function to clone an interaction.

---
 src/math/interaction.c | 19 ++++++++++++++++++-
 src/math/interaction.h |  1 +
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/math/interaction.c b/src/math/interaction.c
index 269aa7e9..4e4134f0 100644
--- a/src/math/interaction.c
+++ b/src/math/interaction.c
@@ -42,7 +42,6 @@
 */
 
 
-
 struct interaction *
 interaction_create (const struct variable *v)
 {
@@ -57,6 +56,24 @@ interaction_create (const struct variable *v)
   return i;
 }
 
+/* Deep copy an interaction */
+struct interaction *
+interaction_clone (const struct interaction *iact)
+{
+  int v;
+  struct interaction  *i = xmalloc (sizeof *i);
+  i->vars = xcalloc (iact->n_vars, sizeof *i->vars);
+  i->n_vars = iact->n_vars;
+
+  for (v = 0; v < iact->n_vars; ++v)
+    {
+      i->vars[v] = iact->vars[v];
+    }
+
+  return i;
+}
+
+
 void
 interaction_destroy (struct interaction *i)
 {
diff --git a/src/math/interaction.h b/src/math/interaction.h
index ccd6706f..23bd4f21 100644
--- a/src/math/interaction.h
+++ b/src/math/interaction.h
@@ -33,6 +33,7 @@ struct interaction
 };
 
 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 *);
-- 
2.30.2