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1 | // |
2 | // detail/handler_work.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2017 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_HANDLER_WORK_HPP | |
12 | #define BOOST_ASIO_DETAIL_HANDLER_WORK_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/asio/detail/config.hpp> | |
19 | #include <boost/asio/associated_executor.hpp> | |
20 | #include <boost/asio/detail/handler_invoke_helpers.hpp> | |
21 | ||
22 | #include <boost/asio/detail/push_options.hpp> | |
23 | ||
24 | namespace boost { | |
25 | namespace asio { | |
26 | namespace detail { | |
27 | ||
28 | // A helper class template to allow completion handlers to be dispatched | |
29 | // through either the new executors framework or the old invocaton hook. The | |
30 | // primary template uses the new executors framework. | |
31 | template <typename Handler, typename Executor | |
32 | = typename associated_executor<Handler>::type> | |
33 | class handler_work | |
34 | { | |
35 | public: | |
36 | explicit handler_work(Handler& handler) BOOST_ASIO_NOEXCEPT | |
37 | : executor_(associated_executor<Handler>::get(handler)) | |
38 | { | |
39 | } | |
40 | ||
41 | static void start(Handler& handler) BOOST_ASIO_NOEXCEPT | |
42 | { | |
43 | Executor ex(associated_executor<Handler>::get(handler)); | |
44 | ex.on_work_started(); | |
45 | } | |
46 | ||
47 | ~handler_work() | |
48 | { | |
49 | executor_.on_work_finished(); | |
50 | } | |
51 | ||
52 | template <typename Function> | |
53 | void complete(Function& function, Handler& handler) | |
54 | { | |
55 | executor_.dispatch(BOOST_ASIO_MOVE_CAST(Function)(function), | |
56 | associated_allocator<Handler>::get(handler)); | |
57 | } | |
58 | ||
59 | private: | |
60 | // Disallow copying and assignment. | |
61 | handler_work(const handler_work&); | |
62 | handler_work& operator=(const handler_work&); | |
63 | ||
64 | typename associated_executor<Handler>::type executor_; | |
65 | }; | |
66 | ||
67 | // This specialisation dispatches a handler through the old invocation hook. | |
68 | // The specialisation is not strictly required for correctness, as the | |
69 | // system_executor will dispatch through the hook anyway. However, by doing | |
70 | // this we avoid an extra copy of the handler. | |
71 | template <typename Handler> | |
72 | class handler_work<Handler, system_executor> | |
73 | { | |
74 | public: | |
75 | explicit handler_work(Handler&) BOOST_ASIO_NOEXCEPT {} | |
76 | static void start(Handler&) BOOST_ASIO_NOEXCEPT {} | |
77 | ~handler_work() {} | |
78 | ||
79 | template <typename Function> | |
80 | void complete(Function& function, Handler& handler) | |
81 | { | |
82 | boost_asio_handler_invoke_helpers::invoke(function, handler); | |
83 | } | |
84 | ||
85 | private: | |
86 | // Disallow copying and assignment. | |
87 | handler_work(const handler_work&); | |
88 | handler_work& operator=(const handler_work&); | |
89 | }; | |
90 | ||
91 | } // namespace detail | |
92 | } // namespace asio | |
93 | } // namespace boost | |
94 | ||
95 | #include <boost/asio/detail/pop_options.hpp> | |
96 | ||
97 | #endif // BOOST_ASIO_DETAIL_HANDLER_WORK_HPP |