81 lines
6.1 KiB
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81 lines
6.1 KiB
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>execution::set_value</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="execution__set_error.html" title="execution::set_error">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="execution__set_error.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="execution__start.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.execution__set_value"></a><a class="link" href="execution__set_value.html" title="execution::set_value">execution::set_value</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.execution__set_value"></a>
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</p>
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<p>
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A customisation point that delivers a value to a receiver.
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</p>
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<pre class="programlisting"><span class="keyword">constexpr</span> <span class="identifier">unspecified</span> <span class="identifier">set_value</span> <span class="special">=</span> <span class="identifier">unspecified</span><span class="special">;</span>
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</pre>
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<p>
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The name <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">set_value</span></code> denotes a customisation point
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object. The expression <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="identifier">R</span><span class="special">,</span>
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<span class="identifier">Vs</span><span class="special">...)</span></code>
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for some subexpressions <code class="computeroutput"><span class="identifier">R</span></code>
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and <code class="computeroutput"><span class="identifier">Vs</span><span class="special">...</span></code>
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is expression-equivalent to:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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<code class="computeroutput"><span class="identifier">R</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="identifier">Vs</span><span class="special">...)</span></code>,
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if that expression is valid. If the function selected does not send the
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value(s) <code class="computeroutput"><span class="identifier">Vs</span><span class="special">...</span></code>
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to the receiver <code class="computeroutput"><span class="identifier">R</span></code>'s value
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channel, the program is ill-formed with no diagnostic required.
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</li>
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<li class="listitem">
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Otherwise, <code class="computeroutput"><span class="identifier">set_value</span><span class="special">(</span><span class="identifier">R</span><span class="special">,</span> <span class="identifier">Vs</span><span class="special">...)</span></code>, if that expression is valid, with
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overload resolution performed in a context that includes the declaration
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<code class="computeroutput"><span class="keyword">void</span> <span class="identifier">set_value</span><span class="special">();</span></code> and that does not include a declaration
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of <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">set_value</span></code>. If the function selected
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by overload resolution does not send the value(s) <code class="computeroutput"><span class="identifier">Vs</span><span class="special">...</span></code> to the receiver <code class="computeroutput"><span class="identifier">R</span></code>'s
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value channel, the program is ill-formed with no diagnostic required.
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</li>
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<li class="listitem">
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Otherwise, <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="identifier">R</span><span class="special">,</span> <span class="identifier">Vs</span><span class="special">...)</span></code> is ill-formed.
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</li>
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</ul></div>
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<h5>
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<a name="asio.reference.execution__set_value.h0"></a>
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<span><a name="asio.reference.execution__set_value.requirements"></a></span><a class="link" href="execution__set_value.html#asio.reference.execution__set_value.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/execution/set_value.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio/execution.hpp</code>
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div>
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<hr>
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