overload2.html
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<title>post (2 of 3 overloads)</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.post.overload2"></a><a class="link" href="overload2.html" title="post (2 of 3 overloads)">post (2 of 3 overloads)</a>
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<p>
Submits a completion token or function object for execution.
</p>
<pre class="programlisting">template<
typename <a class="link" href="../Executor1.html" title="Executor requirements">Executor</a>,
typename CompletionToken = <a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>>
<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> post(
const Executor & ex,
CompletionToken && token = <a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>,
typename enable_if< execution::is_executor< Executor >::value||is_executor< Executor >::value >::type * = 0);
</pre>
<p>
This function submits an object for execution using the specified executor.
The function object is queued for execution, and is never called from the
current thread prior to returning from <code class="computeroutput">post()</code>.
</p>
<p>
The use of <code class="computeroutput">post()</code>, rather than <a class="link" href="../defer.html" title="defer"><code class="computeroutput">defer</code></a>
, indicates the caller's preference that the function object be eagerly
queued for execution.
</p>
<p>
This function has the following effects:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Constructs a function object handler of type <code class="computeroutput">Handler</code>,
initialized with <code class="computeroutput">handler(forward<CompletionToken>(token))</code>.
</li>
<li class="listitem">
Constructs an object <code class="computeroutput">result</code> of type <code class="computeroutput">async_result<Handler></code>,
initializing the object as <code class="computeroutput">result(handler)</code>.
</li>
<li class="listitem">
Obtains the handler's associated executor object <code class="computeroutput">ex1</code> by
performing <code class="computeroutput">get_associated_executor(handler)</code>.
</li>
<li class="listitem">
Creates a work object <code class="computeroutput">w</code> by performing <code class="computeroutput">make_work(ex1)</code>.
</li>
<li class="listitem">
Obtains the handler's associated allocator object <code class="computeroutput">alloc</code>
by performing <code class="computeroutput">get_associated_allocator(handler)</code>.
</li>
<li class="listitem">
Constructs a function object <code class="computeroutput">f</code> with a function call operator
that performs <code class="computeroutput">ex1.dispatch(std::move(handler), alloc)</code>
followed by <code class="computeroutput">w.reset()</code>.
</li>
<li class="listitem">
Performs <code class="computeroutput">Executor(ex).post(std::move(f), alloc)</code>.
</li>
<li class="listitem">
Returns <code class="computeroutput">result.get()</code>.
</li>
</ul></div>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 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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