From 1ec75006864e8f96531685f34347939bb29eca16 Mon Sep 17 00:00:00 2001
From: greg7mdp <greg7mdp@gmail.com>
Date: Sat, 2 Nov 2024 19:20:32 -0400
Subject: [PATCH] Add preprocessor macro `GTL_DISABLE_MIX` to disable hash
 mixing.

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

diff --git a/include/gtl/phmap.hpp b/include/gtl/phmap.hpp
index 4b4f591..11612f5 100644
--- a/include/gtl/phmap.hpp
+++ b/include/gtl/phmap.hpp
@@ -2524,7 +2524,11 @@ 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;
     };
@@ -4313,7 +4317,11 @@ 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;
     };