diff -Nur original/desktop/src/optout.h modified/desktop/src/optout.h
--- original/desktop/src/optout.h	2013-11-17 23:56:58.000000000 +0000
+++ modified/desktop/src/optout.h	2018-06-18 12:11:40.870542851 +0100
@@ -92,6 +92,8 @@
 	typedef std::vector<Element*>			container_type;
 	typedef container_type::iterator		iterator;
 	typedef container_type::const_iterator		const_iterator;
+	typedef container_type::reverse_iterator	reverse_iterator;
+	typedef container_type::const_reverse_iterator	const_reverse_iterator;
 	typedef container_type::size_type		size_type;
 
 private:
@@ -134,10 +136,10 @@
 	const_iterator begin() const { return m_con.begin(); }
 	iterator end() { return m_con.end(); }
 	const_iterator end() const { return m_con.end(); }
-	iterator rbegin() { return m_con.rbegin(); }
-	const_iterator rbegin() const { return m_con.rbegin(); }
-	iterator rend() { return m_con.rend(); }
-	const_iterator rend() const { return m_con.rend(); }
+	reverse_iterator rbegin() { return m_con.rbegin(); }
+	const_reverse_iterator rbegin() const { return m_con.rbegin(); }
+	reverse_iterator rend() { return m_con.rend(); }
+	const_reverse_iterator rend() const { return m_con.rend(); }
 
 	// since iterators hold Element* pointers, these functions
 	// are just a helpful dynamic cast aid