From 40c0d888e69decf39fa614c4d07badbe5d92e6a3 Mon Sep 17 00:00:00 2001
From: Patrick Wuttke <mewin@mewin.de>
Date: Wed, 2 Jul 2025 23:10:30 +0200
Subject: [PATCH] Added std::hash for tuples, because why not.

---
 source/mijin/util/hash.hpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/source/mijin/util/hash.hpp b/source/mijin/util/hash.hpp
index 9ebe40b..7b359bb 100644
--- a/source/mijin/util/hash.hpp
+++ b/source/mijin/util/hash.hpp
@@ -6,6 +6,8 @@
 #define MIJIN_UTIL_HASH_HPP_INCLUDED 1
 
 #include <functional>
+#include <tuple>
+#include <utility>
 
 namespace mijin
 {
@@ -16,4 +18,21 @@ inline void hashCombine(std::size_t& seed, const T& value, const THasher& hasher
 }
 }
 
+template<typename... T>
+struct std::hash<std::tuple<T...>>
+{
+    std::size_t operator()(const std::tuple<T...>& tuple) const noexcept
+    {
+        return hashImpl(tuple, std::index_sequence_for<T...>());
+    }
+
+    template<std::size_t... indices>
+    std::size_t hashImpl(const std::tuple<T...>& tuple, std::index_sequence<indices...>) const noexcept
+    {
+        std::size_t result = 0;
+        (mijin::hashCombine(result, std::get<indices>(tuple)), ...);
+        return result;
+    }
+};
+
 #endif // MIJIN_UTIL_HASH_HPP_INCLUDED