diff --git a/llvm/include/llvm/ADT/ArrayRef.h b/llvm/include/llvm/ADT/ArrayRef.h
--- a/llvm/include/llvm/ADT/ArrayRef.h
+++ b/llvm/include/llvm/ADT/ArrayRef.h
@@ -40,10 +40,17 @@
   template<typename T>
   class LLVM_GSL_POINTER LLVM_NODISCARD ArrayRef {
   public:
-    using iterator = const T *;
-    using const_iterator = const T *;
-    using size_type = size_t;
+    using value_type = T;
+    using pointer = value_type *;
+    using const_pointer = const value_type *;
+    using reference = value_type &;
+    using const_reference = const value_type &;
+    using iterator = const_pointer;
+    using const_iterator = const_pointer;
     using reverse_iterator = std::reverse_iterator<iterator>;
+    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+    using size_type = size_t;
+    using difference_type = ptrdiff_t;
 
   private:
     /// The start of the array, in an external buffer.
@@ -297,8 +304,17 @@
   template<typename T>
   class LLVM_NODISCARD MutableArrayRef : public ArrayRef<T> {
   public:
-    using iterator = T *;
+    using value_type = T;
+    using pointer = value_type *;
+    using const_pointer = const value_type *;
+    using reference = value_type &;
+    using const_reference = const value_type &;
+    using iterator = pointer;
+    using const_iterator = const_pointer;
     using reverse_iterator = std::reverse_iterator<iterator>;
+    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+    using size_type = size_t;
+    using difference_type = ptrdiff_t;
 
     /// Construct an empty MutableArrayRef.
     /*implicit*/ MutableArrayRef() = default;