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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_threads
+/// @{
+///
+/// @file thread_parallel_runner_cxx.h
+/// @brief C++ header-only helper for @ref thread_parallel_runner.h.
+///
+/// There's no binary library associated with the header since this is a header
+/// only library.
+
+#ifndef JXL_THREAD_PARALLEL_RUNNER_CXX_H_
+#define JXL_THREAD_PARALLEL_RUNNER_CXX_H_
+
+#include <jxl/thread_parallel_runner.h>
+
+#include <memory>
+
+#if !(defined(__cplusplus) || defined(c_plusplus))
+#error \
+    "This a C++ only header. Use jxl/jxl_thread_parallel_runner.h from C" \
+    "sources."
+#endif
+
+/// Struct to call JxlThreadParallelRunnerDestroy from the
+/// JxlThreadParallelRunnerPtr unique_ptr.
+struct JxlThreadParallelRunnerDestroyStruct {
+  /// Calls @ref JxlThreadParallelRunnerDestroy() on the passed runner.
+  void operator()(void* runner) { JxlThreadParallelRunnerDestroy(runner); }
+};
+
+/// std::unique_ptr<> type that calls JxlThreadParallelRunnerDestroy() when
+/// releasing the runner.
+///
+/// Use this helper type from C++ sources to ensure the runner is destroyed and
+/// their internal resources released.
+typedef std::unique_ptr<void, JxlThreadParallelRunnerDestroyStruct>
+    JxlThreadParallelRunnerPtr;
+
+/// Creates an instance of JxlThreadParallelRunner into a
+/// JxlThreadParallelRunnerPtr and initializes it.
+///
+/// This function returns a unique_ptr that will call
+/// JxlThreadParallelRunnerDestroy() when releasing the pointer. See @ref
+/// JxlThreadParallelRunnerCreate for details on the instance creation.
+///
+/// @param memory_manager custom allocator function. It may be NULL. The memory
+///        manager will be copied internally.
+/// @param num_worker_threads the number of worker threads to create.
+/// @return a @c NULL JxlThreadParallelRunnerPtr if the instance can not be
+/// allocated or initialized
+/// @return initialized JxlThreadParallelRunnerPtr instance otherwise.
+static inline JxlThreadParallelRunnerPtr JxlThreadParallelRunnerMake(
+    const JxlMemoryManager* memory_manager, size_t num_worker_threads) {
+  return JxlThreadParallelRunnerPtr(
+      JxlThreadParallelRunnerCreate(memory_manager, num_worker_threads));
+}
+
+#endif  // JXL_THREAD_PARALLEL_RUNNER_CXX_H_
+
+/// @}