Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for an old version of boost. Click here for the latest Boost documentation.


// basic_logger.hpp
// ~~~~~~~~~~~~~~~~
// Copyright (c) 2003-2011 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


#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
  /// 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 io_service The io_service object used to locate the logger service.
   * @param identifier An identifier for this logger.
  explicit basic_logger(boost::asio::io_service& io_service,
      const std::string& identifier)
    : service_(boost::asio::use_service<Service>(io_service)),
    service_.create(impl_, identifier);

  /// Destructor.

  /// Get the io_service associated with the object.
  boost::asio::io_service& get_io_service()
    return service_.get_io_service();

  /// 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);

  /// The backend service implementation.
  service_type& service_;

  /// The underlying native implementation.
  impl_type impl_;

} // namespace services