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+//
+// detail/win_iocp_operation.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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/socket_types.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