From f99e6507eec954f72496b799f4b2150f74f94ff2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?kleines=20Filmr=C3=B6llchen?= <malu.bertsch@gmail.com>
Date: Thu, 19 Aug 2021 14:46:05 +0200
Subject: [PATCH] AK: Add Traits for Enums

Enums can be hashed as their underlying integral type. This allows enum
keys in hash maps etc.
---
 AK/Traits.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/AK/Traits.h b/AK/Traits.h
index e6a973ae649..6d90fb0733b 100644
--- a/AK/Traits.h
+++ b/AK/Traits.h
@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <AK/Concepts.h>
 #include <AK/Forward.h>
 #include <AK/HashFunctions.h>
 
@@ -41,6 +42,12 @@ requires(IsPointer<T>) struct Traits<T> : public GenericTraits<T> {
     static constexpr bool is_trivial() { return true; }
 };
 
+template<Enum T>
+struct Traits<T> : public GenericTraits<T> {
+    static unsigned hash(T value) { return Traits<UnderlyingType<T>>::hash(to_underlying(value)); }
+    static constexpr bool is_trivial() { return Traits<UnderlyingType<T>>::is_trivial(); }
+};
+
 }
 
 using AK::GenericTraits;