Imported Upstream version 1.64.0
[platform/upstream/boost.git] / libs / asio / doc / requirements / ResolverService.qbk
1 [/
2  / Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
3  /
4  / Distributed under the Boost Software License, Version 1.0. (See accompanying
5  / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6  /]
7
8 [section:ResolverService Resolver service requirements]
9
10 A resolver service must meet the requirements for an [link
11 boost_asio.reference.IoObjectService I/O object service], as well as the
12 additional requirements listed below.
13
14 In the table below, `X` denotes a resolver service class for protocol
15 `InternetProtocol`, `a` denotes a value of type `X`, `b` denotes a value of
16 type `X::implementation_type`, `q` denotes a value of type
17 `ip::basic_resolver_query<InternetProtocol>`, `e` denotes a value of type
18 `ip::basic_endpoint<InternetProtocol>`, `ec` denotes a value of type
19 `error_code`, and `h` denotes a value meeting [link
20 boost_asio.reference.ResolveHandler `ResolveHandler`] requirements.
21
22 [table ResolverService requirements
23   [[expression] [return type] [assertion/note\npre/post-condition]]
24   [
25     [`a.destroy(b);`]
26     []
27     [
28       From [link boost_asio.reference.IoObjectService IoObjectService]
29       requirements. Implicitly cancels asynchronous resolve operations, as if by
30       calling `a.cancel(b, ec)`.
31     ]
32   ]
33   [
34     [``
35       a.cancel(b, ec);
36     ``]
37     [`error_code`]
38     [
39       Causes any outstanding asynchronous resolve operations to complete as
40       soon as possible. Handlers for cancelled operations shall be passed the
41       error code `error::operation_aborted`.
42     ]
43   ]
44   [
45     [``
46       a.resolve(b, q, ec);
47     ``]
48     [``
49       ip::basic_resolver_iterator<
50         InternetProtocol>
51     ``]
52     [
53       On success, returns an iterator `i` such that `i !=
54       ip::basic_resolver_iterator<InternetProtocol>()`. Otherwise returns
55       `ip::basic_resolver_iterator<InternetProtocol>()`.
56     ]
57   ]
58   [
59     [``
60       a.async_resolve(b, q, h);
61     ``]
62     []
63     [
64       Initiates an asynchronous resolve operation that is performed via the
65       `io_service` object `a.get_io_service()` and behaves according to [link
66       boost_asio.reference.asynchronous_operations asynchronous operation]
67       requirements.\n
68       \n
69       If the operation completes successfully, the `ResolveHandler` object `h`
70       shall be invoked with an iterator object `i` such that the condition `i
71       != ip::basic_resolver_iterator<InternetProtocol>()` holds. Otherwise it
72       is invoked with `ip::basic_resolver_iterator<InternetProtocol>()`.
73     ]
74   ]
75   [
76     [``
77       a.resolve(b, e, ec);
78     ``]
79     [``
80       ip::basic_resolver_iterator<
81         InternetProtocol>
82     ``]
83     [
84       On success, returns an iterator `i` such that `i !=
85       ip::basic_resolver_iterator<InternetProtocol>()`. Otherwise returns
86       `ip::basic_resolver_iterator<InternetProtocol>()`.
87     ]
88   ]
89   [
90     [``
91       a.async_resolve(b, e, h);
92     ``]
93     []
94     [
95       Initiates an asynchronous resolve operation that is performed via the
96       `io_service` object `a.get_io_service()` and behaves according to [link
97       boost_asio.reference.asynchronous_operations asynchronous operation]
98       requirements.\n
99       \n
100       If the operation completes successfully, the `ResolveHandler` object `h`
101       shall be invoked with an iterator object `i` such that the condition `i
102       != ip::basic_resolver_iterator<InternetProtocol>()` holds. Otherwise it
103       is invoked with `ip::basic_resolver_iterator<InternetProtocol>()`.
104     ]
105   ]
106 ]
107
108 [endsect]