190 lines
7.4 KiB
HTML
190 lines
7.4 KiB
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>async_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="async_read_until/overload12.html" title="async_read_until (12 of 12 overloads)">
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<link rel="next" href="async_result/async_result.html" title="async_result::async_result">
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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="async_read_until/overload12.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="async_result/async_result.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.async_result"></a><a class="link" href="async_result.html" title="async_result">async_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.async_result"></a>
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</p>
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<p>
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An interface for customising the behaviour of an initiating function.
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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">CompletionToken</span><span class="special">,</span>
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<span class="keyword">typename</span><span class="special">...</span> <span class="identifier">Signatures</span><span class="special">></span>
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<span class="keyword">class</span> <span class="identifier">async_result</span>
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</pre>
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<h5>
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<a name="asio.reference.async_result.h0"></a>
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<span><a name="asio.reference.async_result.types"></a></span><a class="link" href="async_result.html#asio.reference.async_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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<thead><tr>
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<p>
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Name
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<p>
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Description
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</p>
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</tr></thead>
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<tbody>
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<p>
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<a class="link" href="async_result/completion_handler_type.html" title="async_result::completion_handler_type"><span class="bold"><strong>completion_handler_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 concrete completion handler type for the specific signature.
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</p>
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</td>
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</tr>
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<td>
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<p>
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<a class="link" href="async_result/return_type.html" title="async_result::return_type"><span class="bold"><strong>return_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 return type of the initiating function.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<h5>
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<a name="asio.reference.async_result.h1"></a>
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<span><a name="asio.reference.async_result.member_functions"></a></span><a class="link" href="async_result.html#asio.reference.async_result.member_functions">Member
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Functions</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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<thead><tr>
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<th>
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<p>
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Name
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<th>
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Description
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</th>
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</tr></thead>
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<tbody>
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<p>
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<a class="link" href="async_result/async_result.html" title="async_result::async_result"><span class="bold"><strong>async_result</strong></span></a> <span class="silver">[constructor]</span>
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</p>
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</td>
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<td>
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<p>
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Construct an async result from a given handler.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<a class="link" href="async_result/get.html" title="async_result::get"><span class="bold"><strong>get</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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Obtain the value to be returned from the initiating function.
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</p>
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</td>
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</tr>
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<td>
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<p>
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<a class="link" href="async_result/initiate.html" title="async_result::initiate"><span class="bold"><strong>initiate</strong></span></a> <span class="silver">[static]</span>
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</p>
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</td>
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<td>
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<p>
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Initiate the asynchronous operation that will produce the result,
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and obtain the value to be returned from the initiating function.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<p>
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The <a class="link" href="async_result.html" title="async_result"><code class="computeroutput"><span class="identifier">async_result</span></code></a>
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traits class is used for determining:
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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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the concrete completion handler type to be called at the end of the asynchronous
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operation;
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</li>
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<li class="listitem">
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the initiating function return type; and
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</li>
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<li class="listitem">
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how the return value of the initiating function is obtained.
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</li>
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</ul></div>
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<p>
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The trait allows the handler and return types to be determined at the point
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where the specific completion handler signature is known.
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</p>
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<p>
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This template may be specialised for user-defined completion token types.
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The primary template assumes that the CompletionToken is the completion handler.
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</p>
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<h5>
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<a name="asio.reference.async_result.h2"></a>
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<span><a name="asio.reference.async_result.requirements"></a></span><a class="link" href="async_result.html#asio.reference.async_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/async_result.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="async_read_until/overload12.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="async_result/async_result.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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