1 | // |
2 | // placeholders.hpp |
3 | // ~~~~~~~~~~~~~~~~ |
4 | // |
5 | // Copyright (c) 2003-2024 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_PLACEHOLDERS_HPP |
12 | #define BOOST_ASIO_PLACEHOLDERS_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/detail/functional.hpp> |
20 | |
21 | #include <boost/asio/detail/push_options.hpp> |
22 | |
23 | namespace boost { |
24 | namespace asio { |
25 | namespace placeholders { |
26 | |
27 | #if defined(GENERATING_DOCUMENTATION) |
28 | |
29 | /// An argument placeholder, for use with std::bind() or boost::bind(), that |
30 | /// corresponds to the error argument of a handler for any of the asynchronous |
31 | /// functions. |
32 | unspecified error; |
33 | |
34 | /// An argument placeholder, for use with std::bind() or boost::bind(), that |
35 | /// corresponds to the bytes_transferred argument of a handler for asynchronous |
36 | /// functions such as boost::asio::basic_stream_socket::async_write_some or |
37 | /// boost::asio::async_write. |
38 | unspecified bytes_transferred; |
39 | |
40 | /// An argument placeholder, for use with std::bind() or boost::bind(), that |
41 | /// corresponds to the iterator argument of a handler for asynchronous functions |
42 | /// such as boost::asio::async_connect. |
43 | unspecified iterator; |
44 | |
45 | /// An argument placeholder, for use with std::bind() or boost::bind(), that |
46 | /// corresponds to the results argument of a handler for asynchronous functions |
47 | /// such as boost::asio::basic_resolver::async_resolve. |
48 | unspecified results; |
49 | |
50 | /// An argument placeholder, for use with std::bind() or boost::bind(), that |
51 | /// corresponds to the results argument of a handler for asynchronous functions |
52 | /// such as boost::asio::async_connect. |
53 | unspecified endpoint; |
54 | |
55 | /// An argument placeholder, for use with std::bind() or boost::bind(), that |
56 | /// corresponds to the signal_number argument of a handler for asynchronous |
57 | /// functions such as boost::asio::signal_set::async_wait. |
58 | unspecified signal_number; |
59 | |
60 | #else |
61 | |
62 | static constexpr auto& error = std::placeholders::_1; |
63 | static constexpr auto& bytes_transferred = std::placeholders::_2; |
64 | static constexpr auto& iterator = std::placeholders::_2; |
65 | static constexpr auto& results = std::placeholders::_2; |
66 | static constexpr auto& endpoint = std::placeholders::_2; |
67 | static constexpr auto& signal_number = std::placeholders::_2; |
68 | |
69 | #endif |
70 | |
71 | } // namespace placeholders |
72 | } // namespace asio |
73 | } // namespace boost |
74 | |
75 | #include <boost/asio/detail/pop_options.hpp> |
76 | |
77 | #endif // BOOST_ASIO_PLACEHOLDERS_HPP |
78 | |