1 files changed, 11 insertions, 0 deletions

diff --git a/src/common/hash.h b/src/common/hash.h
index 40194d1ee..c939709bc 100644
--- a/src/common/hash.h
+++ b/src/common/hash.h
@@ -6,6 +6,8 @@
 
 #include <cstddef>
 #include <cstring>
+#include <utility>
+#include <boost/functional/hash.hpp>
 #include "common/cityhash.h"
 #include "common/common_types.h"
 
@@ -68,4 +70,13 @@ struct HashableStruct {
     }
 };
 
+struct PairHash {
+    template <class T1, class T2>
+    std::size_t operator()(const std::pair<T1, T2>& pair) const {
+        std::size_t seed = std::hash<T1>()(pair.first);
+        boost::hash_combine(seed, std::hash<T2>()(pair.second));
+        return seed;
+    }
+};
+
 } // namespace Common