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<title>Acknowledgements</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_optional.reference.acknowledgements"></a><a class="link" href="acknowledgements.html" title="Acknowledgements">Acknowledgements</a>
</h3></div></div></div>
<h5>
<a name="boost_optional.reference.acknowledgements.h0"></a>
        <span class="phrase"><a name="boost_optional.reference.acknowledgements.pre_formal_review"></a></span><a class="link" href="acknowledgements.html#boost_optional.reference.acknowledgements.pre_formal_review">Pre-formal
        review</a>
      </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Peter Dimov suggested the name 'optional', and was the first to point
            out the need for aligned storage.
          </li>
<li class="listitem">
            Douglas Gregor developed 'type_with_alignment', and later Eric Friedman
            coded 'aligned_storage', which are the core of the optional class implementation.
          </li>
<li class="listitem">
            Andrei Alexandrescu and Brian Parker also worked with aligned storage
            techniques and their work influenced the current implementation.
          </li>
<li class="listitem">
            Gennadiy Rozental made extensive and important comments which shaped
            the design.
          </li>
<li class="listitem">
            Vesa Karvonen and Douglas Gregor made quite useful comparisons between
            optional, variant and any; and made other relevant comments.
          </li>
<li class="listitem">
            Douglas Gregor and Peter Dimov commented on comparisons and evaluation
            in boolean contexts.
          </li>
<li class="listitem">
            Eric Friedman helped understand the issues involved with aligned storage,
            move/copy operations and exception safety.
          </li>
<li class="listitem">
            Many others have participated with useful comments: Aleksey Gurotov,
            Kevlin Henney, David Abrahams, and others I can't recall.
          </li>
</ul></div>
<h5>
<a name="boost_optional.reference.acknowledgements.h1"></a>
        <span class="phrase"><a name="boost_optional.reference.acknowledgements.post_formal_review"></a></span><a class="link" href="acknowledgements.html#boost_optional.reference.acknowledgements.post_formal_review">Post-formal
        review</a>
      </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            William Kempf carefully considered the originally proposed interface
            and suggested the new interface which is currently used. He also started
            and fueled the discussion about the analogy optional&lt;&gt;/smart pointer
            and about relational operators.
          </li>
<li class="listitem">
            Peter Dimov, Joel de Guzman, David Abrahams, Tanton Gibbs and Ian Hanson
            focused on the relational semantics of optional (originally undefined);
            concluding with the fact that the pointer-like interface doesn't make
            it a pointer so it shall have deep relational operators.
          </li>
<li class="listitem">
            Augustus Saunders also explored the different relational semantics between
            optional&lt;&gt; and a pointer and developed the OptionalPointee concept
            as an aid against potential conflicts on generic code.
          </li>
<li class="listitem">
            Joel de Guzman noticed that optional&lt;&gt; can be seen as an API on
            top of variant&lt;T,nil_t&gt;.
          </li>
<li class="listitem">
            Dave Gomboc explained the meaning and usage of the Haskell analog to
            optional&lt;&gt;: the Maybe type constructor (analogy originally pointed
            out by David Sankel).
          </li>
<li class="listitem">
            Other comments were posted by Vincent Finn, Anthony Williams, Ed Brey,
            Rob Stewart, and others.
          </li>
<li class="listitem">
            Joel de Guzman made the case for the support of references and helped
            with the proper semantics.
          </li>
<li class="listitem">
            Mat Marcus shown the virtues of a value-oriented interface, influencing
            the current design, and contributed the idea of "none".
          </li>
<li class="listitem">
            Vladimir Batov's design of Boost.Convert library motivated the development
            of value accessors for <code class="computeroutput"><span class="identifier">optional</span></code>:
            functions <code class="computeroutput"><span class="identifier">value</span></code>, <code class="computeroutput"><span class="identifier">value_or</span></code>, <code class="computeroutput"><span class="identifier">value_or_eval</span></code>.
          </li>
</ul></div>
</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 &#169; 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright &#169; 2014-2016 Andrzej Krzemie&#324;ski<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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