1 files changed, 9 insertions, 0 deletions
diff --git a/src/include/novel_types.h b/src/include/novel_types.h
index 0edb5ec..17af150 100755
--- a/src/include/novel_types.h
+++ b/src/include/novel_types.h
@@ -80,6 +80,15 @@ enum RemoveIndexResult{
     REMOVE_OK = 0,             /* remove ok */
     REMOVE_ITEM_DONOT_EXISTS   /* item don't exists */
 };
+
+/* For Phrase Index */
+enum PhraseIndexError{
+    ERROR_OK = 0,                /* operate ok */
+    ERROR_NO_SUB_PHRASE_INDEX,   /* sub phrase index is not loaded */
+    ERROR_NO_ITEM,               /* item has a null slot */
+    ERROR_OUT_OF_RANGE           /* beyond the end of the sub phrase index */
+};
+
 /*
  *  n-gram Definition
  *  no B parameter(there are duplicated items in uni-gram and bi-gram)