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+//
+// detail/null_thread.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_NULL_THREAD_HPP
+#define ASIO_DETAIL_NULL_THREAD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if !defined(ASIO_HAS_THREADS)
+
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/throw_error.hpp"
+#include "asio/error.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class null_thread
+ : private noncopyable
+{
+public:
+ // Constructor.
+ template <typename Function>
+ null_thread(Function, unsigned int = 0)
+ {
+ asio::detail::throw_error(
+ asio::error::operation_not_supported, "thread");
+ }
+
+ // Destructor.
+ ~null_thread()
+ {
+ }
+
+ // Wait for the thread to exit.
+ void join()
+ {
+ }
+
+ // Get number of CPUs.
+ static std::size_t hardware_concurrency()
+ {
+ return 1;
+ }
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // !defined(ASIO_HAS_THREADS)
+
+#endif // ASIO_DETAIL_NULL_THREAD_HPP