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diff --git a/third_party/jpeg-xl/lib/include/jxl/butteraugli_cxx.h b/third_party/jpeg-xl/lib/include/jxl/butteraugli_cxx.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/// @addtogroup libjxl_butteraugli
+/// @{
+///
+/// @file butteraugli_cxx.h
+/// @brief C++ header-only helper for @ref butteraugli.h.
+///
+/// There's no binary library associated with the header since this is a header
+/// only library.
+
+#ifndef JXL_BUTTERAUGLI_CXX_H_
+#define JXL_BUTTERAUGLI_CXX_H_
+
+#include <jxl/butteraugli.h>
+
+#include <memory>
+
+#if !(defined(__cplusplus) || defined(c_plusplus))
+#error "This a C++ only header. Use jxl/butteraugli.h from C sources."
+#endif
+
+/// Struct to call JxlButteraugliApiDestroy from the JxlButteraugliApiPtr
+/// unique_ptr.
+struct JxlButteraugliApiDestroyStruct {
+  /// Calls @ref JxlButteraugliApiDestroy() on the passed api.
+  void operator()(JxlButteraugliApi* api) { JxlButteraugliApiDestroy(api); }
+};
+
+/// std::unique_ptr<> type that calls JxlButteraugliApiDestroy() when releasing
+/// the pointer.
+///
+/// Use this helper type from C++ sources to ensure the api is destroyed and
+/// their internal resources released.
+typedef std::unique_ptr<JxlButteraugliApi, JxlButteraugliApiDestroyStruct>
+    JxlButteraugliApiPtr;
+
+/// Struct to call JxlButteraugliResultDestroy from the JxlButteraugliResultPtr
+/// unique_ptr.
+struct JxlButteraugliResultDestroyStruct {
+  /// Calls @ref JxlButteraugliResultDestroy() on the passed result object.
+  void operator()(JxlButteraugliResult* result) {
+    JxlButteraugliResultDestroy(result);
+  }
+};
+
+/// std::unique_ptr<> type that calls JxlButteraugliResultDestroy() when
+/// releasing the pointer.
+///
+/// Use this helper type from C++ sources to ensure the result object is
+/// destroyed and their internal resources released.
+typedef std::unique_ptr<JxlButteraugliResult, JxlButteraugliResultDestroyStruct>
+    JxlButteraugliResultPtr;
+
+#endif  // JXL_BUTTERAUGLI_CXX_H_
+
+/// @}