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diff --git a/Swiften/Whiteboard/Elements/WhiteboardElementVisitor.h b/Swiften/Whiteboard/Elements/WhiteboardElementVisitor.h
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+++ b/Swiften/Whiteboard/Elements/WhiteboardElementVisitor.h
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+/*
+ * Copyright (c) 2012 Mateusz Piękos
+ * Licensed under the simplified BSD license.
+ * See Documentation/Licenses/BSD-simplified.txt for more information.
+ */
+
+#pragma once
+
+namespace Swift {
+	class WhiteboardLineElement;
+
+	class WhiteboardElementVisitor {
+	public:
+		virtual ~WhiteboardElementVisitor() {}
+		virtual void visit(const WhiteboardLineElement* /*element*/) = 0;
+	};
+}