96 lines
4.8 KiB
HTML
96 lines
4.8 KiB
HTML
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<html>
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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>prefer_result</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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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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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="prefer.html" title="prefer">
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<link rel="next" href="prefer_result/type.html" title="prefer_result::type">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
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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="prefer.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="prefer_result/type.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.prefer_result"></a><a class="link" href="prefer_result.html" title="prefer_result">prefer_result</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.prefer_result"></a>
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</p>
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<p>
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A type trait that determines the result type of a <code class="computeroutput"><span class="identifier">prefer</span></code>
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expression.
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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">T</span><span class="special">,</span>
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<span class="keyword">typename</span><span class="special">...</span> <span class="identifier">Properties</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">prefer_result</span>
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</pre>
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<h5>
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<a name="asio.reference.prefer_result.h0"></a>
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<span><a name="asio.reference.prefer_result.types"></a></span><a class="link" href="prefer_result.html#asio.reference.prefer_result.types">Types</a>
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</h5>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Name
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<a class="link" href="prefer_result/type.html" title="prefer_result::type"><span class="bold"><strong>type</strong></span></a>
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</p>
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</td>
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<td>
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<p>
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The result of the prefer expression.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<p>
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Class template <code class="computeroutput"><span class="identifier">prefer_result</span></code>
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is a trait that determines the result type of the expression <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">prefer</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">declval</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(),</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">declval</span><span class="special"><</span><span class="identifier">Properties</span><span class="special">>()...)</span></code>.
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</p>
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<h5>
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<a name="asio.reference.prefer_result.h1"></a>
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<span><a name="asio.reference.prefer_result.requirements"></a></span><a class="link" href="prefer_result.html#asio.reference.prefer_result.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/prefer.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.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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<a accesskey="p" href="prefer.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="prefer_result/type.html"><img src="../../next.png" alt="Next"></a>
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</div>
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</body>
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</html>
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