1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>execution::set_error</title> 5<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../reference.html" title="Reference"> 9<link rel="prev" href="execution__set_done.html" title="execution::set_done"> 10<link rel="next" href="execution__set_value.html" title="execution::set_value"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 15<td align="center"><a href="../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="execution__set_done.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="execution__set_value.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="boost_asio.reference.execution__set_error"></a><a class="link" href="execution__set_error.html" title="execution::set_error">execution::set_error</a> 28</h3></div></div></div> 29<p> 30 <a class="indexterm" name="boost_asio.indexterm.execution__set_error"></a> 31A customisation 32 point that delivers an error notification to a receiver. 33 </p> 34<pre class="programlisting">constexpr unspecified set_error = unspecified; 35</pre> 36<p> 37 The name <code class="computeroutput">execution::set_error</code> denotes a customisation point 38 object. The expression <code class="computeroutput">execution::set_error(R, E)</code> for some subexpressions 39 <code class="computeroutput">R</code> and <code class="computeroutput">E</code> are expression-equivalent to: 40 </p> 41<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 42<li class="listitem"> 43 <code class="computeroutput">R.set_error(E)</code>, if that expression is valid. If the function 44 selected does not send the error <code class="computeroutput">E</code> to the receiver <code class="computeroutput">R</code>'s 45 error channel, the program is ill-formed with no diagnostic required. 46 </li> 47<li class="listitem"> 48 Otherwise, <code class="computeroutput">set_error(R, E)</code>, if that expression is valid, 49 with overload resolution performed in a context that includes the declaration 50 <code class="computeroutput">void set_error();</code> and that does not include a declaration 51 of <code class="computeroutput">execution::set_error</code>. If the function selected by overload 52 resolution does not send the error <code class="computeroutput">E</code> to the receiver <code class="computeroutput">R</code>'s 53 error channel, the program is ill-formed with no diagnostic required. 54 </li> 55<li class="listitem"> 56 Otherwise, <code class="computeroutput">execution::set_error(R, E)</code> is ill-formed. 57 </li> 58</ul></div> 59<h5> 60<a name="boost_asio.reference.execution__set_error.h0"></a> 61 <span class="phrase"><a name="boost_asio.reference.execution__set_error.requirements"></a></span><a class="link" href="execution__set_error.html#boost_asio.reference.execution__set_error.requirements">Requirements</a> 62 </h5> 63<p> 64 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/execution/set_error.hpp</code> 65 </p> 66<p> 67 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio/execution.hpp</code> 68 </p> 69</div> 70<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 71<td align="left"></td> 72<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 73 Kohlhoff<p> 74 Distributed under the Boost Software License, Version 1.0. (See accompanying 75 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>) 76 </p> 77</div></td> 78</tr></table> 79<hr> 80<div class="spirit-nav"> 81<a accesskey="p" href="execution__set_done.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="execution__set_value.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 82</div> 83</body> 84</html> 85
