From 08a25c2b1fc7c989077be6abea15ddcb678ac3b6 Mon Sep 17 00:00:00 2001
From: elsid <elsid.mail@gmail.com>
Date: Sat, 13 Nov 2021 16:14:50 +0100
Subject: [PATCH] Support seed type different from std::size_t for hashCombine

---
 components/misc/hash.hpp | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/components/misc/hash.hpp b/components/misc/hash.hpp
index 30a9c41ee9..861df73772 100644
--- a/components/misc/hash.hpp
+++ b/components/misc/hash.hpp
@@ -1,15 +1,20 @@
 #ifndef MISC_HASH_H
 #define MISC_HASH_H
 
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+
 namespace Misc
 {
     /// Implemented similar to the boost::hash_combine
-    template <class T>
-    inline void hashCombine(std::size_t& seed, const T& v)
+    template <class Seed, class T>
+    inline void hashCombine(Seed& seed, const T& v)
     {
+        static_assert(sizeof(Seed) >= sizeof(std::size_t), "Resulting hash will be truncated");
         std::hash<T> hasher;
-        seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
+        seed ^= static_cast<Seed>(hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2));
     }
 }
 
-#endif
\ No newline at end of file
+#endif