AK: Add Array::in_reverse()

AK/Array.h

@@ -8,6 +8,7 @@
 
 #include <AK/Iterator.h>
 #include <AK/Optional.h>
+#include <AK/ReverseIterator.h>
 #include <AK/Span.h>
 #include <AK/StdLibExtras.h>
 #include <AK/Tuple.h>
@@ -112,12 +113,23 @@ struct Array {
 
     using ConstIterator = SimpleIterator<Array const, T const>;
     using Iterator = SimpleIterator<Array, T>;
+    using ReverseIterator = SimpleReverseIterator<Array, T>;
+    using ReverseConstIterator = SimpleReverseIterator<Array const, T const>;
 
     [[nodiscard]] constexpr ConstIterator begin() const { return ConstIterator::begin(*this); }
     [[nodiscard]] constexpr Iterator begin() { return Iterator::begin(*this); }
+    [[nodiscard]] constexpr ReverseConstIterator rbegin() const { return ReverseConstIterator::rbegin(*this); }
+    [[nodiscard]] constexpr ReverseIterator rbegin() { return ReverseIterator::rbegin(*this); }
 
     [[nodiscard]] constexpr ConstIterator end() const { return ConstIterator::end(*this); }
     [[nodiscard]] constexpr Iterator end() { return Iterator::end(*this); }
+    [[nodiscard]] constexpr ReverseConstIterator rend() const { return ReverseConstIterator::rend(*this); }
+    [[nodiscard]] constexpr ReverseIterator rend() { return ReverseConstIterator::rend(*this); }
+
+    ALWAYS_INLINE constexpr auto in_reverse() const
+    {
+        return ReverseWrapper::in_reverse(*this);
+    }
 
     [[nodiscard]] constexpr operator ReadonlySpan<T>() const { return span(); }
     [[nodiscard]] constexpr operator Span<T>() { return span(); }