add extra note of importance to EnumDataConverter and add is_valid_id method

diff --git a/src/util/enums.h b/src/util/enums.h
index 909765216c374bf2741d20b266ffbca5d9bc7c99..69514b202922f516bb930307c0c934f31085d485 100644 (file)
--- a/src/util/enums.h
+++ b/src/util/enums.h
@@ -12,7 +12,9 @@
 
 /* IMPORTANT
  *  When initializing the EnumData struct, you cannot use _(...) to translate strings.
-  * Instead, one must use N_(...) and do the translation every time the string is retreived.
+ * Instead, one must use N_(...) and do the translation every time the string is retreived.
+ *
+ * Note that get_id_from_key and get_id_from_label return 0 if it cannot find an entry for that key string
  */
 
 
@@ -71,6 +73,11 @@ public:
         return false;
     }
 
+    bool is_valid_id(const E e) const
+    {
+        return ( (int)e < end );
+    }
+
     const Glib::ustring& get_label(const E e) const
     {
         return _data[e].label;