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diff --git a/source/blender/depsgraph/intern/eval/deg_eval_flush.h b/source/blender/depsgraph/intern/eval/deg_eval_flush.h
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+++ b/source/blender/depsgraph/intern/eval/deg_eval_flush.h
@@ -0,0 +1,49 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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 the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2013 Blender Foundation.
+ * All rights reserved.
+ *
+ * Original Author: Joshua Leung
+ * Contributor(s): None Yet
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/depsgraph/intern/eval/deg_eval_flush.cc
+ *  \ingroup depsgraph
+ *
+ * Core routines for how the Depsgraph works.
+ */
+
+#pragma once
+
+struct Main;
+
+namespace DEG {
+
+struct Depsgraph;
+
+/* Flush updates from tagged nodes outwards until all affected nodes
+ * are tagged.
+ */
+void deg_graph_flush_updates(struct Main *bmain, struct Depsgraph *graph);
+
+/* Clear tags from all operation nodes. */
+void deg_graph_clear_tags(struct Depsgraph *graph);
+
+}  // namespace DEG