Adds asio library and Storage Module
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Handlers</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="GettableSocketOption.html" title="Gettable socket option requirements">
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<link rel="next" href="HandshakeHandler.html" title="SSL handshake handler requirements">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="GettableSocketOption.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="HandshakeHandler.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.Handler"></a><a class="link" href="Handler.html" title="Handlers">Handlers</a>
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</h3></div></div></div>
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<p>
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A handler must meet the requirements of <code class="computeroutput">MoveConstructible</code> types
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(C++Std [moveconstructible]).
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</p>
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<p>
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In the table below, <code class="computeroutput">X</code> denotes a handler class, <code class="computeroutput">h</code>
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denotes a value of <code class="computeroutput">X</code>, <code class="computeroutput">p</code> denotes a pointer to a
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block of allocated memory of type <code class="computeroutput">void*</code>, <code class="computeroutput">s</code> denotes
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the size for a block of allocated memory, and <code class="computeroutput">f</code> denotes a function
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object taking no arguments.
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</p>
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<div class="table">
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<a name="asio.reference.Handler.t0"></a><p class="title"><b>Table 18. Handler requirements</b></p>
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<div class="table-contents"><table class="table" summary="Handler requirements">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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return type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-conditions
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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</p>
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<pre class="programlisting">using asio::asio_handler_allocate;
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asio_handler_allocate(s, &h);
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</pre>
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<p>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput">void*</code>
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</p>
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</td>
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<td>
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<p>
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Returns a pointer to a block of memory of size <code class="computeroutput">s</code>.
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The pointer must satisfy the same alignment requirements as a pointer
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returned by <code class="computeroutput">::operator new()</code>. Throws <code class="computeroutput">bad_alloc</code>
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on failure.<br> <br> The <code class="computeroutput">asio_handler_allocate()</code>
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function is located using argument-dependent lookup. The function
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<code class="computeroutput">asio::asio_handler_allocate()</code> serves as a default
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if no user-supplied function is available.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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</p>
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<pre class="programlisting">using asio::asio_handler_deallocate;
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asio_handler_deallocate(p, s, &h);
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</pre>
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<p>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Frees a block of memory associated with a pointer <code class="computeroutput">p</code>,
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of at least size <code class="computeroutput">s</code>, that was previously allocated
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using <code class="computeroutput">asio_handler_allocate()</code>.<br> <br> The <code class="computeroutput">asio_handler_deallocate()</code>
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function is located using argument-dependent lookup. The function
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<code class="computeroutput">asio::asio_handler_deallocate()</code> serves as a default
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if no user-supplied function is available.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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</p>
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<pre class="programlisting">using asio::asio_handler_invoke;
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asio_handler_invoke(f, &h);
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</pre>
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<p>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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Causes the function object <code class="computeroutput">f</code> to be executed as if
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by calling <code class="computeroutput">f()</code>.<br> <br> The <code class="computeroutput">asio_handler_invoke()</code>
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function is located using argument-dependent lookup. The function
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<code class="computeroutput">asio::asio_handler_invoke()</code> serves as a default if
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no user-supplied function is available.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
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Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="GettableSocketOption.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="HandshakeHandler.html"><img src="../../next.png" alt="Next"></a>
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</div>
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</body>
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</html>
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