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include/asio/detail/std_thread.hpp

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+//
+// detail/std_thread.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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"
+#include <thread>
+#include "asio/detail/memory.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class std_thread
+{
+public:
+  // Construct in a non-joinable state.
+  std_thread() noexcept
+    : thread_()
+  {
+  }
+
+  // Constructor.
+  template <typename Function>
+  std_thread(Function f, unsigned int = 0)
+    : thread_(f)
+  {
+  }
+
+  // Construct with custom allocator.
+  template <typename Allocator, typename Function>
+  std_thread(allocator_arg_t, const Allocator&, Function f, unsigned int = 0)
+    : thread_(f)
+  {
+  }
+
+  // Move constructor.
+  std_thread(std_thread&& other) noexcept
+    : thread_(static_cast<std::thread&&>(other.thread_))
+  {
+  }
+
+  // Destructor.
+  ~std_thread()
+  {
+  }
+
+  // Move assignment.
+  std_thread& operator=(std_thread&& other) noexcept
+  {
+    thread_ = static_cast<std::thread&&>(other.thread_);
+    return *this;
+  }
+
+  // Whether the thread can be joined.
+  bool joinable() const
+  {
+    return thread_.joinable();
+  }
+
+  // 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 // ASIO_DETAIL_STD_THREAD_HPP