From 52ccdcdb7142a8e8ca55c83f914eba6815d7376f Mon Sep 17 00:00:00 2001
From: greg <greg7mdp@gmail.com>
Date: Mon, 4 Nov 2019 07:33:24 -0500
Subject: [PATCH] improve hash value computation for tuples

---
 parallel_hashmap/phmap_utils.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/parallel_hashmap/phmap_utils.h b/parallel_hashmap/phmap_utils.h
index ef29f08..3cbfcfc 100644
--- a/parallel_hashmap/phmap_utils.h
+++ b/parallel_hashmap/phmap_utils.h
@@ -345,7 +345,8 @@ private:
     _hash_helper(const std::tuple<P...> &t) const noexcept {
         const auto &el = std::get<I>(t);
         using el_type = typename std::remove_cv<typename std::remove_reference<decltype(el)>::type>::type;
-        return phmap::Hash<el_type>()(el) + _hash_helper<I + 1>(t);
+        return Combiner<size_t, sizeof(size_t)>()(
+            phmap::Hash<el_type>()(el),  _hash_helper<I + 1>(t));
     }
 };