Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/reference/io_context/stopped.html

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+<a name="asio.reference.io_context.stopped"></a><a class="link" href="stopped.html" title="io_context::stopped">io_context::stopped</a>
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+<p>
+          <a class="indexterm" name="asio.indexterm.io_context.stopped"></a> 
+Determine whether the
+          <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
+          object has been stopped.
+        </p>
+<pre class="programlisting">bool stopped() const;
+</pre>
+<p>
+          This function is used to determine whether an <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
+          object has been stopped, either through an explicit call to <code class="computeroutput">stop()</code>,
+          or due to running out of work. When an <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
+          object is stopped, calls to <code class="computeroutput">run()</code>, <code class="computeroutput">run_one()</code>,
+          <code class="computeroutput">poll()</code> or <code class="computeroutput">poll_one()</code> will return immediately
+          without invoking any handlers.
+        </p>
+<h6>
+<a name="asio.reference.io_context.stopped.h0"></a>
+          <span><a name="asio.reference.io_context.stopped.return_value"></a></span><a class="link" href="stopped.html#asio.reference.io_context.stopped.return_value">Return
+          Value</a>
+        </h6>
+<p>
+          <code class="computeroutput">true</code> if the <a class="link" href="../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
+          object is stopped, otherwise <code class="computeroutput">false</code>.
+        </p>
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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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