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AK: Add Traits for Enums

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Enums can be hashed as their underlying integral type. This allows enum
keys in hash maps etc.
This commit is contained in:
kleines Filmröllchen 2021-08-19 14:46:05 +02:00 committed by Ali Mohammad Pur
parent 22b836dd7b
commit f99e6507ee
Notes: sideshowbarker 2024-07-18 05:12:37 +09:00 
Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/f99e6507eec
Pull-request: https://github.com/SerenityOS/serenity/pull/9471
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/awesomekling
1 changed files with 7 additions and 0 deletions
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7
AK/Traits.h
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@ -6,6 +6,7 @@
#pragma once #pragma once
#include <AK/Concepts.h>
#include <AK/Forward.h> #include <AK/Forward.h>
#include <AK/HashFunctions.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; } 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; using AK::GenericTraits;