diff --git a/notimpl/readonly.hpp b/notimpl/readonly.hpp
new file mode 100644
index 0000000..a609e22
--- /dev/null
+++ b/notimpl/readonly.hpp
@@ -0,0 +1,26 @@
+#pragma once
+
+/* Interface that implements an exception throwing read method. */
+
+#include "interfaces.hpp"
+
+
+class ReadOnly: public WriteInterface
+{
+    public:
+        ReadOnly()
+            : WriteInterface(0, 0)
+        { }
+
+        void write(double value) override;
+};
+
+class ReadOnlyNoExcept: public WriteInterface
+{
+    public:
+        ReadOnlyNoExcept()
+            : WriteInterface(0, 0)
+        { }
+
+        void write(double value) override;
+};