From b19d1a7807c3f0b30278aa42af35d8a92f7ae515 Mon Sep 17 00:00:00 2001
From: Gregory Popovitch <greg7mdp@gmail.com>
Date: Sat, 2 Nov 2024 19:25:47 -0400
Subject: [PATCH] Add preprocessor macro `GTL_DISABLE_MIX` to disable hash
 mixing. (#29)

---
 include/gtl/phmap.hpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/gtl/phmap.hpp b/include/gtl/phmap.hpp
index a72badb..649dab0 100644
--- a/include/gtl/phmap.hpp
+++ b/include/gtl/phmap.hpp
@@ -2520,7 +2520,11 @@ class raw_hash_set {
     struct HashElement {
         template<class K, class... Args>
         size_t operator()(const K& key, Args&&...) const {
+#if GTL_DISABLE_MIX
+            return h(key);
+#else
             return phmap_mix<sizeof(size_t)>()(static_cast<size_t>(h(key)));
+#endif
         }
         const hasher& h;
     };
@@ -4309,7 +4313,11 @@ class parallel_hash_set {
     struct HashElement {
         template<class K, class... Args>
         size_t operator()(const K& key, Args&&...) const {
+#if GTL_DISABLE_MIX
+            return h(key);
+#else
             return phmap_mix<sizeof(size_t)>()(h(key));
+#endif
         }
         const hasher& h;
     };