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138 lines
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<title>post (1 of 3 overloads)</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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<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="../post.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../post.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="overload2.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><h4 class="title">
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<a name="asio.reference.post.overload1"></a><a class="link" href="overload1.html" title="post (1 of 3 overloads)">post (1 of 3 overloads)</a>
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</h4></div></div></div>
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<p>
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Submits a completion token or function object for execution.
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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> <a class="link" href="../NullaryToken.html" title="Nullary token requirements">NullaryToken</a><span class="special">></span>
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<a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> <span class="identifier">post</span><span class="special">(</span>
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<span class="identifier">NullaryToken</span> <span class="special">&&</span> <span class="identifier">token</span><span class="special">);</span>
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</pre>
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<p>
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This function submits an object for execution using the object's associated
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executor. The function object is queued for execution, and is never called
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from the current thread prior to returning from <code class="computeroutput"><span class="identifier">post</span><span class="special">()</span></code>.
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</p>
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<p>
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The use of <code class="computeroutput"><span class="identifier">post</span><span class="special">()</span></code>,
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rather than <a class="link" href="../defer.html" title="defer"><code class="computeroutput"><span class="identifier">defer</span></code></a>,
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indicates the caller's preference that the function object be eagerly queued
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for execution.
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</p>
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<h6>
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<a name="asio.reference.post.overload1.h0"></a>
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<span><a name="asio.reference.post.overload1.parameters"></a></span><a class="link" href="overload1.html#asio.reference.post.overload1.parameters">Parameters</a>
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</h6>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl>
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<dt><span class="term">token</span></dt>
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<dd>
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<p>
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The <a class="link" href="../../overview/model/completion_tokens.html" title="Completion Tokens">completion
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token</a> that will be used to produce a completion handler. The
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function signature of the completion handler must be:
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</p>
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<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">();</span>
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</pre>
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</dd>
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</dl>
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</div>
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<h6>
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<a name="asio.reference.post.overload1.h1"></a>
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<span><a name="asio.reference.post.overload1.return_value"></a></span><a class="link" href="overload1.html#asio.reference.post.overload1.return_value">Return
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Value</a>
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</h6>
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<p>
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This function returns <code class="computeroutput"><span class="identifier">async_initiate</span><span class="special"><</span><span class="identifier">NullaryToken</span><span class="special">,</span> <span class="keyword">void</span><span class="special">()>(</span><span class="identifier">Init</span><span class="special">{},</span> <span class="identifier">token</span><span class="special">)</span></code>,
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where <code class="computeroutput"><span class="identifier">Init</span></code> is a function
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object type defined as:
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</p>
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<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">Init</span>
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<span class="special">{</span>
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<span class="keyword">public</span><span class="special">:</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">CompletionHandler</span><span class="special">></span>
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<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">CompletionHandler</span><span class="special">&&</span> <span class="identifier">completion_handler</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
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<span class="special">};</span>
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</pre>
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<p>
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The function call operator of <code class="computeroutput"><span class="identifier">Init</span><span class="special">:</span></code>
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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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<p class="simpara">
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Obtains the handler's associated executor object <code class="computeroutput"><span class="identifier">ex</span></code>
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of type <code class="computeroutput"><span class="identifier">Ex</span></code> by performing
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</p>
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<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">ex</span> <span class="special">=</span> <span class="identifier">get_associated_executor</span><span class="special">(</span><span class="identifier">handler</span><span class="special">);</span>
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</pre>
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</li>
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<li class="listitem">
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<p class="simpara">
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Obtains the handler's associated allocator object <code class="computeroutput"><span class="identifier">alloc</span></code>
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by performing
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</p>
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<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">alloc</span> <span class="special">=</span> <span class="identifier">get_associated_allocator</span><span class="special">(</span><span class="identifier">handler</span><span class="special">);</span>
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</pre>
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</li>
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<li class="listitem">
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<p class="simpara">
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If <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special"><</span><span class="identifier">Ex</span><span class="special">>::</span><span class="identifier">value</span></code> is true, performs
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</p>
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<pre class="programlisting"><span class="identifier">prefer</span><span class="special">(</span>
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<span class="identifier">require</span><span class="special">(</span><span class="identifier">ex</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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<span class="identifier">execution</span><span class="special">::</span><span class="identifier">relationship</span><span class="special">.</span><span class="identifier">fork</span><span class="special">,</span>
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<span class="identifier">execution</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">(</span><span class="identifier">alloc</span><span class="special">)</span>
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<span class="special">).</span><span class="identifier">execute</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special"><</span><span class="identifier">CompletionHandler</span><span class="special">>(</span><span class="identifier">completion_handler</span><span class="special">));</span>
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</pre>
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</li>
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<li class="listitem">
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<p class="simpara">
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If <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special"><</span><span class="identifier">Ex</span><span class="special">>::</span><span class="identifier">value</span></code> is false, performs
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</p>
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<pre class="programlisting"><span class="identifier">ex</span><span class="special">.</span><span class="identifier">post</span><span class="special">(</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special"><</span><span class="identifier">CompletionHandler</span><span class="special">>(</span><span class="identifier">completion_handler</span><span class="special">),</span>
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<span class="identifier">alloc</span><span class="special">);</span>
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</pre>
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</li>
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</ul></div>
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<h6>
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<a name="asio.reference.post.overload1.h2"></a>
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<span><a name="asio.reference.post.overload1.completion_signature"></a></span><a class="link" href="overload1.html#asio.reference.post.overload1.completion_signature">Completion
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Signature</a>
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</h6>
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<pre class="programlisting"><span class="keyword">void</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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<div class="spirit-nav">
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<a accesskey="p" href="../post.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../post.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="overload2.html"><img src="../../../next.png" alt="Next"></a>
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