AK: Add a function that casts an enum to its underlying type

This is basically the same thing as `std::to_underlying(Enum)`.

1 files changed, 7 insertions, 0 deletions

diff --git a/AK/StdLibExtras.h b/AK/StdLibExtras.h
index 19411fc4b6..08a5d7a094 100644
--- a/AK/StdLibExtras.h
+++ b/AK/StdLibExtras.h
@@ -110,6 +110,12 @@ constexpr T exchange(T& slot, U&& value)
 template<typename T>
 using RawPtr = typename Detail::_RawPtr<T>::Type;
 
+template<typename V>
+constexpr decltype(auto) to_underlying(V value) requires(IsEnum<V>)
+{
+    return static_cast<UnderlyingType<V>>(value);
+}
+
 }
 
 using AK::array_size;
@@ -121,3 +127,4 @@ using AK::max;
 using AK::min;
 using AK::RawPtr;
 using AK::swap;
+using AK::to_underlying;