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diff --git a/source/blender/depsgraph/intern/depsnode_operation.h b/source/blender/depsgraph/intern/depsnode_operation.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/depsnode_operation.h
+ *  \ingroup depsgraph
+ */
+
+#ifndef __DEPSNODE_OPERATION_H__
+#define __DEPSNODE_OPERATION_H__
+
+#include "depsnode.h"
+
+struct ID;
+
+struct Depsgraph;
+struct DepsgraphCopyContext;
+
+/* Flags for Depsgraph Nodes */
+typedef enum eDepsOperation_Flag {
+	/* node needs to be updated */
+	DEPSOP_FLAG_NEEDS_UPDATE       = (1 << 0),
+
+	/* node was directly modified, causing need for update */
+	/* XXX: intention is to make it easier to tell when we just need to take subgraphs */
+	DEPSOP_FLAG_DIRECTLY_MODIFIED  = (1 << 1),
+
+	/* Operation is evaluated using CPython; has GIL and security implications... */
+	DEPSOP_FLAG_USES_PYTHON   = (1 << 2),
+} eDepsOperation_Flag;
+
+/* Atomic Operation - Base type for all operations */
+struct OperationDepsNode : public DepsNode {
+
+
+	OperationDepsNode();
+	~OperationDepsNode();
+
+	string identifier() const;
+	string full_identifier() const;
+
+	void tag_update(Depsgraph *graph);
+
+	bool is_noop() const { return (bool)evaluate == false; }
+
+	OperationDepsNode *get_entry_operation() { return this; }
+	OperationDepsNode *get_exit_operation() { return this; }
+
+	ComponentDepsNode *owner;     /* component that contains the operation */
+
+	DepsEvalOperationCb evaluate; /* callback for operation */
+
+
+	uint32_t num_links_pending; /* how many inlinks are we still waiting on before we can be evaluated... */
+	float eval_priority;
+	bool scheduled;
+
+	short optype;                 /* (eDepsOperation_Type) stage of evaluation */
+	int   opcode;                 /* (eDepsOperation_Code) identifier for the operation being performed */
+
+	int flag;                     /* (eDepsOperation_Flag) extra settings affecting evaluation */
+
+	DEG_DEPSNODE_DECLARE;
+};
+
+void DEG_register_operation_depsnodes();
+
+#endif  /* __DEPSNODE_OPERATION_H__ */