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<title>dispatch (1 of 3 overloads)</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.dispatch.overload1"></a><a class="link" href="overload1.html" title="dispatch (1 of 3 overloads)">dispatch (1 of 3
overloads)</a>
</h4></div></div></div>
<p>
Submits a completion token or function object for execution.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <a class="link" href="../NullaryToken.html" title="Nullary token requirements">NullaryToken</a><span class="special">&gt;</span>
<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">dispatch</span><span class="special">(</span>
<span class="identifier">NullaryToken</span> <span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">);</span>
</pre>
<p>
This function submits an object for execution using the object's associated
executor. The function object may be called from the current thread prior
to returning from <code class="computeroutput"><span class="identifier">dispatch</span><span class="special">()</span></code>. Otherwise, it is queued for execution.
</p>
<h6>
<a name="asio.reference.dispatch.overload1.h0"></a>
<span><a name="asio.reference.dispatch.overload1.parameters"></a></span><a class="link" href="overload1.html#asio.reference.dispatch.overload1.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">token</span></dt>
<dd>
<p>
The <a class="link" href="../../overview/model/completion_tokens.html" title="Completion Tokens">completion
token</a> that will be used to produce a completion handler. The
function signature of the completion handler must be:
</p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">();</span>
</pre>
</dd>
</dl>
</div>
<h6>
<a name="asio.reference.dispatch.overload1.h1"></a>
<span><a name="asio.reference.dispatch.overload1.return_value"></a></span><a class="link" href="overload1.html#asio.reference.dispatch.overload1.return_value">Return
Value</a>
</h6>
<p>
This function returns <code class="computeroutput"><span class="identifier">async_initiate</span><span class="special">&lt;</span><span class="identifier">NullaryToken</span><span class="special">,</span> <span class="keyword">void</span><span class="special">()&gt;(</span><span class="identifier">Init</span><span class="special">{},</span> <span class="identifier">token</span><span class="special">)</span></code>,
where <code class="computeroutput"><span class="identifier">Init</span></code> is a function
object type defined as:
</p>
<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">Init</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CompletionHandler</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">CompletionHandler</span><span class="special">&amp;&amp;</span> <span class="identifier">completion_handler</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
The function call operator of <code class="computeroutput"><span class="identifier">Init</span><span class="special">:</span></code>
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p class="simpara">
Obtains the handler's associated executor object <code class="computeroutput"><span class="identifier">ex</span></code>
of type <code class="computeroutput"><span class="identifier">Ex</span></code> by performing
</p>
<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>
</pre>
</li>
<li class="listitem">
<p class="simpara">
Obtains the handler's associated allocator object <code class="computeroutput"><span class="identifier">alloc</span></code>
by performing
</p>
<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>
</pre>
</li>
<li class="listitem">
<p class="simpara">
If <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special">&lt;</span><span class="identifier">Ex</span><span class="special">&gt;::</span><span class="identifier">value</span></code> is true, performs
</p>
<pre class="programlisting"><span class="identifier">prefer</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">allocator</span><span class="special">(</span><span class="identifier">alloc</span><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">&lt;</span><span class="identifier">CompletionHandler</span><span class="special">&gt;(</span><span class="identifier">completion_handler</span><span class="special">));</span>
</pre>
</li>
<li class="listitem">
<p class="simpara">
If <code class="computeroutput"><span class="identifier">execution</span><span class="special">::</span><span class="identifier">is_executor</span><span class="special">&lt;</span><span class="identifier">Ex</span><span class="special">&gt;::</span><span class="identifier">value</span></code> is false, performs
</p>
<pre class="programlisting"><span class="identifier">ex</span><span class="special">.</span><span class="identifier">dispatch</span><span class="special">(</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">CompletionHandler</span><span class="special">&gt;(</span><span class="identifier">completion_handler</span><span class="special">),</span>
<span class="identifier">alloc</span><span class="special">);</span>
</pre>
</li>
</ul></div>
<h6>
<a name="asio.reference.dispatch.overload1.h2"></a>
<span><a name="asio.reference.dispatch.overload1.completion_signature"></a></span><a class="link" href="overload1.html#asio.reference.dispatch.overload1.completion_signature">Completion
Signature</a>
</h6>
<pre class="programlisting"><span class="keyword">void</span><span class="special">()</span>
</pre>
</div>
<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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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