yield_context.html
6.62 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>yield_context</title>
<link rel="stylesheet" href="../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="../../index.html" title="Asio">
<link rel="up" href="../reference.html" title="Reference">
<link rel="prev" href="write_at/overload8.html" title="write_at (8 of 8 overloads)">
<link rel="next" href="../net_ts.html" title="Networking TS compatibility">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="write_at/overload8.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="../net_ts.html"><img src="../../next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.yield_context"></a><a class="link" href="yield_context.html" title="yield_context">yield_context</a>
</h3></div></div></div>
<p>
<a class="indexterm" name="asio.indexterm.yield_context"></a>
Context object that represents the
currently executing coroutine.
</p>
<pre class="programlisting">typedef basic_yield_context< unspecified > yield_context;
</pre>
<h5>
<a name="asio.reference.yield_context.h0"></a>
<span><a name="asio.reference.yield_context.types"></a></span><a class="link" href="yield_context.html#asio.reference.yield_context.types">Types</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<a class="link" href="basic_yield_context/callee_type.html" title="basic_yield_context::callee_type"><span class="bold"><strong>callee_type</strong></span></a>
</p>
</td>
<td>
<p>
The coroutine callee type, used by the implementation.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="basic_yield_context/caller_type.html" title="basic_yield_context::caller_type"><span class="bold"><strong>caller_type</strong></span></a>
</p>
</td>
<td>
<p>
The coroutine caller type, used by the implementation.
</p>
</td>
</tr>
</tbody>
</table></div>
<h5>
<a name="asio.reference.yield_context.h1"></a>
<span><a name="asio.reference.yield_context.member_functions"></a></span><a class="link" href="yield_context.html#asio.reference.yield_context.member_functions">Member
Functions</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<a class="link" href="basic_yield_context/basic_yield_context.html" title="basic_yield_context::basic_yield_context"><span class="bold"><strong>basic_yield_context</strong></span></a> <span class="silver">[constructor]</span>
</p>
</td>
<td>
<p>
Construct a yield context to represent the specified coroutine.
<br> <span class="silver"> —</span><br> Construct a yield context from another yield context
type.
</p>
</td>
</tr>
<tr>
<td>
<p>
<a class="link" href="basic_yield_context/operator_lb__rb_.html" title="basic_yield_context::operator[]"><span class="bold"><strong>operator[]</strong></span></a>
</p>
</td>
<td>
<p>
Return a yield context that sets the specified error_code.
</p>
</td>
</tr>
</tbody>
</table></div>
<p>
The <a class="link" href="basic_yield_context.html" title="basic_yield_context"><code class="computeroutput">basic_yield_context</code></a>
class is used to represent the currently executing stackful coroutine. A
<a class="link" href="basic_yield_context.html" title="basic_yield_context"><code class="computeroutput">basic_yield_context</code></a>
may be passed as a handler to an asynchronous operation. For example:
</p>
<pre class="programlisting">template <typename Handler>
void my_coroutine(basic_yield_context<Handler> yield)
{
...
std::size_t n = my_socket.async_read_some(buffer, yield);
...
}
</pre>
<p>
The initiating function (async_read_some in the above example) suspends the
current coroutine. The coroutine is resumed when the asynchronous operation
completes, and the result of the operation is returned.
</p>
<h5>
<a name="asio.reference.yield_context.h2"></a>
<span><a name="asio.reference.yield_context.requirements"></a></span><a class="link" href="yield_context.html#asio.reference.yield_context.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/spawn.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span>None
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="write_at/overload8.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="../net_ts.html"><img src="../../next.png" alt="Next"></a>
</div>
</body>
</html>