1 files changed, 4 insertions, 0 deletions

diff --git a/common/index.h b/common/index.h
index 3cd7cc8..08b499f 100644
--- a/common/index.h
+++ b/common/index.h
@@ -11,6 +11,10 @@
 class Index
 {
 public:
+    enum ErrorCodes {
+        IndexNotAvailable = -1
+    };
+
     class Error
     {
     public: