Adds asio library and Storage Module

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

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+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.reference.io_context.has_service"></a><a class="link" href="has_service.html" title="io_context::has_service">io_context::has_service</a>
+</h4></div></div></div>
+<p>
+          <span class="emphasis"><em>Inherited from execution_context.</em></span>
+        </p>
+<p>
+          <a class="indexterm" name="asio.indexterm.io_context.has_service"></a> 
+Determine if
+          an <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
+          contains a specified service type.
+        </p>
+<pre class="programlisting">template&lt;
+    typename <a class="link" href="../Service.html" title="Service requirements">Service</a>&gt;
+friend bool has_service(
+    execution_context &amp; e);
+</pre>
+<p>
+          This function is used to determine whether the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
+          contains a service object corresponding to the given service type.
+        </p>
+<h6>
+<a name="asio.reference.io_context.has_service.h0"></a>
+          <span><a name="asio.reference.io_context.has_service.parameters"></a></span><a class="link" href="has_service.html#asio.reference.io_context.has_service.parameters">Parameters</a>
+        </h6>
+<div class="variablelist">
+<p class="title"><b></b></p>
+<dl>
+<dt><span class="term">e</span></dt>
+<dd><p>
+                The <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
+                object that owns the service.
+              </p></dd>
+</dl>
+</div>
+<h6>
+<a name="asio.reference.io_context.has_service.h1"></a>
+          <span><a name="asio.reference.io_context.has_service.return_value"></a></span><a class="link" href="has_service.html#asio.reference.io_context.has_service.return_value">Return Value</a>
+        </h6>
+<p>
+          A boolean indicating whether the <a class="link" href="../execution_context.html" title="execution_context"><code class="computeroutput">execution_context</code></a>
+          contains the service.
+        </p>
+<h6>
+<a name="asio.reference.io_context.has_service.h2"></a>
+          <span><a name="asio.reference.io_context.has_service.requirements"></a></span><a class="link" href="has_service.html#asio.reference.io_context.has_service.requirements">Requirements</a>
+        </h6>
+<p>
+          <span class="emphasis"><em>Header: </em></span><code class="literal">asio/io_context.hpp</code>
+        </p>
+<p>
+          <span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
+        </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<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>)
+      </p>
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