Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/reference/read_write_operations.html

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+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.reference.read_write_operations"></a><a class="link" href="read_write_operations.html" title="Requirements on read and write operations">Requirements on
+      read and write operations</a>
+</h3></div></div></div>
+<p>
+        A <span class="emphasis"><em>read operation</em></span> is an operation that reads data into
+        a mutable buffer sequence argument of a type meeting <a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements"><code class="computeroutput">MutableBufferSequence</code></a>
+        requirements. The mutable buffer sequence specifies memory where the data
+        should be placed. A read operation shall always fill a buffer in the sequence
+        completely before proceeding to the next.
+      </p>
+<p>
+        A <span class="emphasis"><em>write operation</em></span> is an operation that writes data from
+        a constant buffer sequence argument of a type meeting <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements"><code class="computeroutput">ConstBufferSequence</code></a>
+        requirements. The constant buffer sequence specifies memory where the data
+        to be written is located. A write operation shall always write a buffer in
+        the sequence completely before proceeding to the next.
+      </p>
+<p>
+        If a read or write operation is also an <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous
+        operation</a>, the operation shall maintain one or more copies of the
+        buffer sequence until such time as the operation no longer requires access
+        to the memory specified by the buffers in the sequence. The program shall
+        ensure the memory remains valid until:
+      </p>
+<p>
+        — the last copy of the buffer sequence is destroyed, or
+      </p>
+<p>
+        — the completion handler for the asynchronous operation is invoked,
+      </p>
+<p>
+        whichever comes first.
+      </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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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>)
+      </p>
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