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87 lines
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>execution::execute</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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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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<a accesskey="p" href="execution__context_t/polymorphic_query_result_type.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__executor_index.html"><img src="../../next.png" alt="Next"></a>
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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__execute"></a><a class="link" href="execution__execute.html" title="execution::execute">execution::execute</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__execute"></a>
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</p>
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<p>
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(Deprecated: Use <code class="computeroutput"><span class="identifier">execute</span></code>
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member function.) A customisation point that executes a function on an executor.
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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">execute</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">execute</span></code> denotes a customisation point object.
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</p>
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<p>
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For some subexpressions <code class="computeroutput"><span class="identifier">e</span></code>
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and <code class="computeroutput"><span class="identifier">f</span></code>, let <code class="computeroutput"><span class="identifier">E</span></code> be a type such that <code class="computeroutput"><span class="keyword">decltype</span><span class="special">((</span><span class="identifier">e</span><span class="special">))</span></code>
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is <code class="computeroutput"><span class="identifier">E</span></code> and let <code class="computeroutput"><span class="identifier">F</span></code> be a type such that <code class="computeroutput"><span class="keyword">decltype</span><span class="special">((</span><span class="identifier">f</span><span class="special">))</span></code>
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is <code class="computeroutput"><span class="identifier">F</span></code>. The expression <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">execute</span><span class="special">(</span><span class="identifier">e</span><span class="special">,</span> <span class="identifier">f</span><span class="special">)</span></code> is ill-formed if <code class="computeroutput"><span class="identifier">F</span></code>
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does not model <code class="computeroutput"><span class="identifier">invocable</span></code>,
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or if <code class="computeroutput"><span class="identifier">E</span></code> does not model either
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<code class="computeroutput"><span class="identifier">executor</span></code> or <code class="computeroutput"><span class="identifier">sender</span></code>. Otherwise, it is expression-equivalent
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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">e</span><span class="special">.</span><span class="identifier">execute</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>,
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if that expression is valid. If the function selected does not execute
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the function object <code class="computeroutput"><span class="identifier">f</span></code>
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on the executor <code class="computeroutput"><span class="identifier">e</span></code>, the
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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">execute</span><span class="special">(</span><span class="identifier">e</span><span class="special">,</span> <span class="identifier">f</span><span class="special">)</span></code>,
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if that expression is valid, with overload resolution performed in a
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context that includes the declaration <code class="computeroutput"><span class="keyword">void</span>
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<span class="identifier">execute</span><span class="special">();</span></code>
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and that does not include a declaration of <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">execute</span></code>.
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If the function selected by overload resolution does not execute the
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function object <code class="computeroutput"><span class="identifier">f</span></code> on
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the executor <code class="computeroutput"><span class="identifier">e</span></code>, the program
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is ill-formed with no diagnostic required.
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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__execute.h0"></a>
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<span><a name="asio.reference.execution__execute.requirements"></a></span><a class="link" href="execution__execute.html#asio.reference.execution__execute.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/execute.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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<div class="spirit-nav">
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