Merge pull request #4900 from michaelwoerister/update-c33010-and-c33011

Update code-quality/c33010.md and /code-quality/c33011.md

Author: prmerger-automator[bot]

docs/code-quality/c33010.md

@@ -9,7 +9,7 @@ helpviewer_keywords: ["C33010"]
 ---
 # Warning C33010
 
-> Unchecked lower bound for enum *enum_name* used as index.
+> Unchecked lower bound for enum 'enum' used as index.
 
 This warning is triggered if an enum is both used as an index into an array and isn't checked on the lower bound.
 
@@ -71,6 +71,31 @@ void foo(Index idx, PFN(&functions)[5])
 }
 ```
 
+Alternatively, the issue can be fixed by choosing an underlying type for `Index` that is unsigned. Because an unsigned value is always positive, it is sufficient to only check the upper bound.
+
+```cpp
+typedef void (*PFN)();
+
+enum class Index : unsigned int
+{
+    Zero,
+    One,
+    Two,
+    Three,
+    Max
+};
+
+void foo(Index idx, PFN(&functions)[5])
+{
+    if (idx > Index::Max)
+        return;
+
+    auto pfn = functions[static_cast<unsigned int>(idx)];
+    if (pfn != nullptr)
+        (*pfn)();
+}
+```
+
 ## See also
 
 [C33011](./c33011.md)

docs/code-quality/c33011.md

@@ -4,7 +4,7 @@ description: C33011 warning for enums
 author: hwisungi
 ms.author: hwisungi
 ms.date: 06/20/2020
-f1_keywords: ["C33011", "UNCHECKED_UPPER_BOUND_FOR_ENUMINDEX"]
+f1_keywords: ["C33011", "UNCHECKED_UPPER_BOUND_FOR_ENUMINDEX", "__WARNING_UNCHECKED_UPPER_BOUND_FOR_ENUMINDEX"]
 helpviewer_keywords: ["C33011"]
 ---
 # Warning C33011