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158 lines
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<title>Handlers</title>
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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="boost_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="boost_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 boost::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">boost::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 boost::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">boost::asio::asio_handler_deallocate()</code> serves as a
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default 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 boost::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">boost::asio::asio_handler_invoke()</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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</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 © 2003-2021 Christopher
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M. 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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