text: //
  // null_event.hpp
  // ~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2010 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 BOOST_ASIO_DETAIL_NULL_EVENT_HPP
  #define BOOST_ASIO_DETAIL_NULL_EVENT_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/push_options.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  #include <boost/config.hpp>
  #include <boost/asio/detail/pop_options.hpp>
  
  #if !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
  
  #include <boost/asio/detail/noncopyable.hpp>
  
  namespace boost {
  namespace asio {
  namespace detail {
  
  class null_event
    : private noncopyable
  {
  public:
    // Constructor.
    null_event()
    {
    }
  
    // Destructor.
    ~null_event()
    {
    }
  
    // Signal the event.
    template <typename Lock>
    void signal(Lock&)
    {
    }
  
    // Signal the event and unlock the mutex.
    template <typename Lock>
    void signal_and_unlock(Lock&)
    {
    }
  
    // Reset the event.
    template <typename Lock>
    void clear(Lock&)
    {
    }
  
    // Wait for the event to become signalled.
    template <typename Lock>
    void wait(Lock&)
    {
    }
  };
  
  } // namespace detail
  } // namespace asio
  } // namespace boost
  
  #endif // !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // BOOST_ASIO_DETAIL_NULL_EVENT_HPP
  