text: //
  // detail/win_iocp_operation.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 http://www.boost.org/LICENSE_1_0.txt)
  //
  
  #ifndef BOOST_ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
  #define BOOST_ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/config.hpp>
  
  #if defined(BOOST_ASIO_HAS_IOCP)
  
  #include <boost/asio/detail/handler_tracking.hpp>
  #include <boost/asio/detail/op_queue.hpp>
  #include <boost/asio/detail/win_iocp_io_service_fwd.hpp>
  #include <boost/system/error_code.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace detail {
  
  // Base class for all operations. A function pointer is used instead of virtual
  // functions to avoid the associated overhead.
  class win_iocp_operation
    : public OVERLAPPED
      BOOST_ASIO_ALSO_INHERIT_TRACKED_HANDLER
  {
  public:
    void complete(win_iocp_io_service& owner,
        const boost::system::error_code& ec,
        std::size_t bytes_transferred)
    {
      func_(&owner, this, ec, bytes_transferred);
    }
  
    void destroy()
    {
      func_(0, this, boost::system::error_code(), 0);
    }
  
  protected:
    typedef void (*func_type)(
        win_iocp_io_service*, win_iocp_operation*,
        const boost::system::error_code&, std::size_t);
  
    win_iocp_operation(func_type func)
      : next_(0),
        func_(func)
    {
      reset();
    }
  
    // Prevents deletion through this type.
    ~win_iocp_operation()
    {
    }
  
    void reset()
    {
      Internal = 0;
      InternalHigh = 0;
      Offset = 0;
      OffsetHigh = 0;
      hEvent = 0;
      ready_ = 0;
    }
  
  private:
    friend class op_queue_access;
    friend class win_iocp_io_service;
    win_iocp_operation* next_;
    func_type func_;
    long ready_;
  };
  
  } // namespace detail
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // defined(BOOST_ASIO_HAS_IOCP)
  
  #endif // BOOST_ASIO_DETAIL_WIN_IOCP_OPERATION_HPP
  