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diff --git a/src/boost/libs/asio/example/cpp03/services/basic_logger.hpp b/src/boost/libs/asio/example/cpp03/services/basic_logger.hpp
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+//
+// basic_logger.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2020 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 SERVICES_BASIC_LOGGER_HPP
+#define SERVICES_BASIC_LOGGER_HPP
+
+#include <boost/asio.hpp>
+#include <boost/noncopyable.hpp>
+#include <string>
+
+namespace services {
+
+/// Class to provide simple logging functionality. Use the services::logger
+/// typedef.
+template <typename Service>
+class basic_logger
+  : private boost::noncopyable
+{
+public:
+  /// The type of the service that will be used to provide timer operations.
+  typedef Service service_type;
+
+  /// The native implementation type of the timer.
+  typedef typename service_type::impl_type impl_type;
+
+  /// Constructor.
+  /**
+   * This constructor creates a logger.
+   *
+   * @param context The execution context used to locate the logger service.
+   *
+   * @param identifier An identifier for this logger.
+   */
+  explicit basic_logger(boost::asio::execution_context& context,
+      const std::string& identifier)
+    : service_(boost::asio::use_service<Service>(context)),
+      impl_(service_.null())
+  {
+    service_.create(impl_, identifier);
+  }
+
+  /// Destructor.
+  ~basic_logger()
+  {
+    service_.destroy(impl_);
+  }
+
+  /// Get the io_context associated with the object.
+  boost::asio::io_context& get_io_context()
+  {
+    return service_.get_io_context();
+  }
+
+  /// Set the output file for all logger instances.
+  void use_file(const std::string& file)
+  {
+    service_.use_file(impl_, file);
+  }
+
+  /// Log a message.
+  void log(const std::string& message)
+  {
+    service_.log(impl_, message);
+  }
+
+private:
+  /// The backend service implementation.
+  service_type& service_;
+
+  /// The underlying native implementation.
+  impl_type impl_;
+};
+
+} // namespace services
+
+#endif // SERVICES_BASIC_LOGGER_HPP