lib/dbus/ReadIter: add ForEachRecurse()

src/lib/dbus/ObjectManager.hxx

@@ -70,8 +70,8 @@ template<typename F>
 inline void
 ForEachInterface(ReadMessageIter &&i, F &&f)
 {
-	i.ForEach(DBUS_TYPE_DICT_ENTRY, [&f](auto &&j){
-			RecurseInterfaceDictEntry(j.Recurse(), f);
+	i.ForEachRecurse(DBUS_TYPE_DICT_ENTRY, [&f](auto &&j){
+			RecurseInterfaceDictEntry(std::move(j), f);
 		});
 }
 

src/lib/dbus/ReadIter.hxx

@@ -91,6 +91,17 @@ public:
 		for (; GetArgType() == arg_type; Next())
 			f(*this);
 	}
+
+	/**
+	 * Wrapper for ForEach() which passes a recursed iterator for
+	 * each element.
+	 */
+	template<typename F>
+	void ForEachRecurse(int arg_type, F &&f) {
+		ForEach(arg_type, [&f](auto &&i){
+				f(i.Recurse());
+			});
+	}
 };
 
 } /* namespace ODBus */