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diff --git a/source/blender/depsgraph/intern/depsgraph_type.h b/source/blender/depsgraph/intern/depsgraph_type.h
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+/*
+ * ***** 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/depsgraph_type.h
+ *  \ingroup depsgraph
+ *
+ * Datatypes for internal use in the Depsgraph
+ *
+ * All of these datatypes are only really used within the "core" depsgraph.
+ * In particular, node types declared here form the structure of operations
+ * in the graph.
+ */
+
+#pragma once
+
+#include <functional>
+
+/* TODO(sergey): Ideally we'll just use char* and statically allocated strings
+ * to avoid any possible overhead caused by string (re)allocation/formatting. */
+#include <string>
+#include <vector>
+#include <algorithm>
+
+struct Depsgraph;
+
+namespace DEG {
+
+/* Commonly used types. */
+using std::string;
+using std::vector;
+
+/* Commonly used functions. */
+using std::max;
+using std::to_string;
+
+/* Function bindings. */
+using std::function;
+using namespace std::placeholders;
+#define function_bind std::bind
+
+/* Source of the dependency graph node update tag.
+ *
+ * NOTE: This is a bit mask, so accumulation of sources is possible.
+ *
+ * TODO(sergey): Find a better place for this. */
+enum eUpdateSource {
+	/* Update is caused by a time change. */
+	DEG_UPDATE_SOURCE_TIME       = (1 << 0),
+	/* Update caused by user directly or indirectly influencing the node. */
+	DEG_UPDATE_SOURCE_USER_EDIT  = (1 << 1),
+	/* Update is happening as a special response for the relations update. */
+	DEG_UPDATE_SOURCE_RELATIONS  = (1 << 2),
+	/* Update is happening due to visibility change. */
+	DEG_UPDATE_SOURCE_VISIBILITY = (1 << 3),
+};
+
+}  // namespace DEG