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1 | // | |
2 | // async_result.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 ARCHETYPES_ASYNC_RESULT_HPP | |
12 | #define ARCHETYPES_ASYNC_RESULT_HPP | |
13 | ||
14 | #include <boost/asio/async_result.hpp> | |
15 | ||
16 | namespace archetypes { | |
17 | ||
18 | struct lazy_handler | |
19 | { | |
20 | }; | |
21 | ||
22 | template <typename Signature> | |
23 | struct concrete_handler; | |
24 | ||
25 | template <typename R, typename Arg1> | |
26 | struct concrete_handler<R(Arg1)> | |
27 | { | |
28 | concrete_handler(lazy_handler) | |
29 | { | |
30 | } | |
31 | ||
32 | void operator()(typename boost::asio::decay<Arg1>::type) | |
33 | { | |
34 | } | |
35 | ||
36 | #if defined(BOOST_ASIO_HAS_MOVE) | |
37 | concrete_handler(concrete_handler&&) {} | |
38 | private: | |
39 | concrete_handler(const concrete_handler&); | |
40 | #endif // defined(BOOST_ASIO_HAS_MOVE) | |
41 | }; | |
42 | ||
43 | template <typename R, typename Arg1, typename Arg2> | |
44 | struct concrete_handler<R(Arg1, Arg2)> | |
45 | { | |
46 | concrete_handler(lazy_handler) | |
47 | { | |
48 | } | |
49 | ||
50 | void operator()(typename boost::asio::decay<Arg1>::type, typename boost::asio::decay<Arg2>::type) | |
51 | { | |
52 | } | |
53 | ||
54 | #if defined(BOOST_ASIO_HAS_MOVE) | |
55 | concrete_handler(concrete_handler&&) {} | |
56 | private: | |
57 | concrete_handler(const concrete_handler&); | |
58 | #endif // defined(BOOST_ASIO_HAS_MOVE) | |
59 | }; | |
60 | ||
61 | } // namespace archetypes | |
62 | ||
63 | namespace boost { | |
64 | namespace asio { | |
65 | ||
66 | template <typename Signature> | |
67 | class async_result<archetypes::lazy_handler, Signature> | |
68 | { | |
69 | public: | |
70 | // The concrete completion handler type. | |
71 | typedef archetypes::concrete_handler<Signature> completion_handler_type; | |
72 | ||
73 | // The return type of the initiating function. | |
74 | typedef int return_type; | |
75 | ||
76 | // Construct an async_result from a given handler. | |
77 | explicit async_result(completion_handler_type&) | |
78 | { | |
79 | } | |
80 | ||
81 | // Obtain the value to be returned from the initiating function. | |
82 | return_type get() | |
83 | { | |
84 | return 42; | |
85 | } | |
86 | ||
87 | private: | |
88 | // Disallow copying and assignment. | |
89 | async_result(const async_result&) BOOST_ASIO_DELETED; | |
90 | async_result& operator=(const async_result&) BOOST_ASIO_DELETED; | |
91 | }; | |
92 | ||
93 | } // namespace asio | |
94 | } // namespace boost | |
95 | ||
96 | #endif // ARCHETYPES_ASYNC_RESULT_HPP |