From 2399d65468e4a5f58cd28af2544041e06407a3c6 Mon Sep 17 00:00:00 2001
From: greg <greg7mdp@gmail.com>
Date: Mon, 4 Nov 2019 07:56:25 -0500
Subject: [PATCH] small improvement in std::pair hashing

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

diff --git a/parallel_hashmap/phmap_utils.h b/parallel_hashmap/phmap_utils.h
index 3cbfcfc..3ffa2ec 100644
--- a/parallel_hashmap/phmap_utils.h
+++ b/parallel_hashmap/phmap_utils.h
@@ -323,7 +323,7 @@ using HashState = HashStateBase<size_t>;
 template<class T1, class T2> 
 struct Hash<std::pair<T1, T2>> {
     size_t operator()(std::pair<T1, T2> const& p) const noexcept {
-        return phmap::HashState().combine(0, p.first, p.second);
+        return phmap::HashState().combine(phmap::Hash<T1>()(p.first), p.second);
     }
 };