1 //
2 // detail/scheduler_operation.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 //
10 
11 #ifndef BOOST_ASIO_DETAIL_SCHEDULER_OPERATION_HPP
12 #define BOOST_ASIO_DETAIL_SCHEDULER_OPERATION_HPP
13 
14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
15 # pragma once
16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17 
18 #include <boost/system/error_code.hpp>
19 #include <boost/asio/detail/handler_tracking.hpp>
20 #include <boost/asio/detail/op_queue.hpp>
21 
22 #include <boost/asio/detail/push_options.hpp>
23 
24 namespace boost {
25 namespace asio {
26 namespace detail {
27 
28 class scheduler;
29 
30 // Base class for all operations. A function pointer is used instead of virtual
31 // functions to avoid the associated overhead.
32 class scheduler_operation BOOST_ASIO_INHERIT_TRACKED_HANDLER
33 {
34 public:
35   typedef scheduler_operation operation_type;
36 
complete(void * owner,const boost::system::error_code & ec,std::size_t bytes_transferred)37   void complete(void* owner, const boost::system::error_code& ec,
38       std::size_t bytes_transferred)
39   {
40     func_(owner, this, ec, bytes_transferred);
41   }
42 
destroy()43   void destroy()
44   {
45     func_(0, this, boost::system::error_code(), 0);
46   }
47 
48 protected:
49   typedef void (*func_type)(void*,
50       scheduler_operation*,
51       const boost::system::error_code&, std::size_t);
52 
scheduler_operation(func_type func)53   scheduler_operation(func_type func)
54     : next_(0),
55       func_(func),
56       task_result_(0)
57   {
58   }
59 
60   // Prevents deletion through this type.
~scheduler_operation()61   ~scheduler_operation()
62   {
63   }
64 
65 private:
66   friend class op_queue_access;
67   scheduler_operation* next_;
68   func_type func_;
69 protected:
70   friend class scheduler;
71   unsigned int task_result_; // Passed into bytes transferred.
72 };
73 
74 } // namespace detail
75 } // namespace asio
76 } // namespace boost
77 
78 #include <boost/asio/detail/pop_options.hpp>
79 
80 #endif // BOOST_ASIO_DETAIL_SCHEDULER_OPERATION_HPP
81