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1 | [/ |
2 | / Copyright (c) 2003-2016 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:SignalHandler Signal handler requirements] | |
9 | ||
10 | A signal handler must meet the requirements for a [link | |
11 | boost_asio.reference.Handler handler]. A value `h` of a signal handler class | |
12 | should work correctly in the expression `h(ec, n)`, where `ec` is an lvalue of | |
13 | type `const error_code` and `n` is an lvalue of type `const int`. | |
14 | ||
15 | [heading Examples] | |
16 | ||
17 | A free function as a signal handler: | |
18 | ||
19 | void signal_handler( | |
20 | const boost::system::error_code& ec, | |
21 | int signal_number) | |
22 | { | |
23 | ... | |
24 | } | |
25 | ||
26 | A signal handler function object: | |
27 | ||
28 | struct signal_handler | |
29 | { | |
30 | ... | |
31 | void operator()( | |
32 | const boost::system::error_code& ec, | |
33 | int signal_number) | |
34 | { | |
35 | ... | |
36 | } | |
37 | ... | |
38 | }; | |
39 | ||
40 | A non-static class member function adapted to a signal handler using `bind()`: | |
41 | ||
42 | void my_class::signal_handler( | |
43 | const boost::system::error_code& ec, | |
44 | int signal_number) | |
45 | { | |
46 | ... | |
47 | } | |
48 | ... | |
49 | my_signal_set.async_wait( | |
50 | boost::bind(&my_class::signal_handler, | |
51 | this, boost::asio::placeholders::error, | |
52 | boost::asio::placeholders::signal_number)); | |
53 | ||
54 | [endsect] |