1 files changed, 4 insertions, 1 deletions
diff --git a/include/Hash.hpp b/include/Hash.hpp
index bd87b69..9dce168 100644
--- a/include/Hash.hpp
+++ b/include/Hash.hpp
@@ -3,6 +3,7 @@
 #include "utils.hpp"
 #include <stdexcept>
 #include <unordered_map>
+#include <unordered_set>
 
 namespace odhtdb
 {
@@ -51,5 +52,7 @@ namespace odhtdb
     };
     
     template <typename ValueType>
-    using MapHashKey = std::unordered_map<Hash, ValueType, HashHasher>;
+    using MapHash = std::unordered_map<Hash, ValueType, HashHasher>;
+    
+    using SetHash = std::unordered_set<Hash, HashHasher>;
 }