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diff --git a/third_party/jpeg-xl/lib/include/jxl/decode_cxx.h b/third_party/jpeg-xl/lib/include/jxl/decode_cxx.h
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+++ b/third_party/jpeg-xl/lib/include/jxl/decode_cxx.h
@@ -0,0 +1,57 @@
+// 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_decoder
+/// @{
+///
+/// @file decode_cxx.h
+/// @brief C++ header-only helper for @ref decode.h.
+///
+/// There's no binary library associated with the header since this is a header
+/// only library.
+
+#ifndef JXL_DECODE_CXX_H_
+#define JXL_DECODE_CXX_H_
+
+#include <jxl/decode.h>
+
+#include <memory>
+
+#if !(defined(__cplusplus) || defined(c_plusplus))
+#error "This a C++ only header. Use jxl/decode.h from C sources."
+#endif
+
+/// Struct to call JxlDecoderDestroy from the JxlDecoderPtr unique_ptr.
+struct JxlDecoderDestroyStruct {
+  /// Calls @ref JxlDecoderDestroy() on the passed decoder.
+  void operator()(JxlDecoder* decoder) { JxlDecoderDestroy(decoder); }
+};
+
+/// std::unique_ptr<> type that calls JxlDecoderDestroy() when releasing the
+/// decoder.
+///
+/// Use this helper type from C++ sources to ensure the decoder is destroyed and
+/// their internal resources released.
+typedef std::unique_ptr<JxlDecoder, JxlDecoderDestroyStruct> JxlDecoderPtr;
+
+/// Creates an instance of JxlDecoder into a JxlDecoderPtr and initializes it.
+///
+/// This function returns a unique_ptr that will call JxlDecoderDestroy() when
+/// releasing the pointer. See @ref JxlDecoderCreate for details on the
+/// instance creation.
+///
+/// @param memory_manager custom allocator function. It may be NULL. The memory
+///        manager will be copied internally.
+/// @return a @c NULL JxlDecoderPtr if the instance can not be allocated or
+///         initialized
+/// @return initialized JxlDecoderPtr instance otherwise.
+static inline JxlDecoderPtr JxlDecoderMake(
+    const JxlMemoryManager* memory_manager) {
+  return JxlDecoderPtr(JxlDecoderCreate(memory_manager));
+}
+
+#endif  // JXL_DECODE_CXX_H_
+
+/// @}