================
@@ -0,0 +1,98 @@
+//===---------- SubobjectVisitor.h - Subobject Visitor ----------*- C++
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the SubobjectVisitor interface, which recursively
+// traverses subobjects within a type.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_SUBOBJECTVISITOR_H
+#define LLVM_CLANG_AST_SUBOBJECTVISITOR_H
+
+#include "clang/AST/Type.h"
+
+namespace clang {
+
+template <template <typename> class Ptr, typename Derived>
+class SubobjectVisitorBase {
----------------
tahonermann wrote:
Suggested comment:
```suggestion
/// Given a type, subobject visitors visit all subobjects of the type in depth
/// first order. Both pre-order and post-order visitation are performed so that
/// derived classes can maintain an access path to the visited elements.
/// Subobjects include all base classes and non-static data members, including
/// those that are not subobjects according to the C++standard like data
/// members with a reference type. Virtual base classes are visited each time
/// they appear in a class hierarchy despite there being only one actual
/// subobject present in an object of a most derived type. Array elements are
/// not individually visited; only their containing array is.
template <template <typename> class Ptr, typename Derived>
class SubobjectVisitorBase {
```
https://github.com/llvm/llvm-project/pull/192957
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