56 lines
5.4 KiB
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56 lines
5.4 KiB
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<title>strand::prefer</title>
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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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<a accesskey="p" href="post.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../strand.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="query.html"><img src="../../../next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="asio.reference.strand.prefer"></a><a class="link" href="prefer.html" title="strand::prefer">strand::prefer</a>
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</h4></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.strand.prefer"></a>
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Forward a preference to the underlying
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executor.
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</p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">Property</span><span class="special">></span>
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<span class="identifier">constraint</span><span class="special"><</span> <span class="identifier">can_prefer</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">Executor</span> <span class="special">&,</span> <span class="identifier">Property</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">&&!</span><span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">Property</span><span class="special">,</span> <span class="identifier">execution</span><span class="special">::</span><span class="identifier">blocking_t</span><span class="special">::</span><span class="identifier">always_t</span> <span class="special">>::</span><span class="identifier">value</span><span class="special">,</span> <span class="identifier">strand</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">decay</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">prefer_result</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">Executor</span> <span class="special">&,</span> <span class="identifier">Property</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">></span> <span class="special">>::</span><span class="identifier">type</span> <span class="identifier">prefer</span><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">Property</span> <span class="special">&</span> <span class="identifier">p</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
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</pre>
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<p>
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Do not call this function directly. It is intended for use with the <a class="link" href="../prefer.html" title="prefer"><code class="computeroutput"><span class="identifier">prefer</span></code></a>
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customisation point.
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</p>
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<p>
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For example:
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</p>
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<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">strand</span><span class="special"><</span><span class="identifier">my_executor_type</span><span class="special">></span> <span class="identifier">ex1</span> <span class="special">=</span> <span class="special">...;</span>
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<span class="keyword">auto</span> <span class="identifier">ex2</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">prefer</span><span class="special">(</span><span class="identifier">ex1</span><span class="special">,</span>
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<span class="identifier">asio</span><span class="special">::</span><span class="identifier">execution</span><span class="special">::</span><span class="identifier">blocking</span><span class="special">.</span><span class="identifier">never</span><span class="special">);</span>
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</pre>
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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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