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+<title>Implementation Notes</title>
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+<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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+<p>
+ <code class="computeroutput"><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span></code> is
+ currently implemented using a custom aligned storage facility built from <code class="computeroutput"><span class="identifier">alignment_of</span></code> and <code class="computeroutput"><span class="identifier">type_with_alignment</span></code>
+ (both from Type Traits). It uses a separate boolean flag to indicate the initialization
+ state. Placement new with <code class="computeroutput"><span class="identifier">T</span></code>'s
+ copy/move constructor and <code class="computeroutput"><span class="identifier">T</span></code>'s
+ destructor are explicitly used to initialize, copy, move and destroy optional
+ values. As a result, <code class="computeroutput"><span class="identifier">T</span></code>'s default
+ constructor is effectively by-passed, but the exception guarantees are basic.
+ It is planned to replace the current implementation with another with stronger
+ exception safety, such as a future <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">variant</span></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 © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014 Andrzej Krzemieński<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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