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+//
+// detail/std_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_STD_THREAD_HPP
+#define ASIO_DETAIL_STD_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_STD_THREAD)
+
+#include <thread>
+#include "asio/detail/noncopyable.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class std_thread
+ : private noncopyable
+{
+public:
+ // Constructor.
+ template <typename Function>
+ std_thread(Function f, unsigned int = 0)
+ : thread_(f)
+ {
+ }
+
+ // Destructor.
+ ~std_thread()
+ {
+ join();
+ }
+
+ // Wait for the thread to exit.
+ void join()
+ {
+ if (thread_.joinable())
+ thread_.join();
+ }
+
+ // Get number of CPUs.
+ static std::size_t hardware_concurrency()
+ {
+ return std::thread::hardware_concurrency();
+ }
+
+private:
+ std::thread thread_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_STD_THREAD)
+
+#endif // ASIO_DETAIL_STD_THREAD_HPP