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Added func value_or_eval()
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Andrzej Krzemienski
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Acknowledgements</title>
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<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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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>
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td>
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<td align="center"><a href="../../../../../index.html">Home</a></td>
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<td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td>
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<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="boost_optional.acknowledgements"></a><a class="link" href="acknowledgements.html" title="Acknowledgements">Acknowledgements</a>
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</h2></div></div></div>
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<h4>
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<a name="boost_optional.acknowledgements.h0"></a>
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<span class="phrase"><a name="boost_optional.acknowledgements.pre_formal_review"></a></span><a class="link" href="acknowledgements.html#boost_optional.acknowledgements.pre_formal_review">Pre-formal
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review</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Peter Dimov suggested the name 'optional', and was the first to point out
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the need for aligned storage.
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</li>
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<li class="listitem">
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Douglas Gregor developed 'type_with_alignment', and later Eric Friedman
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coded 'aligned_storage', which are the core of the optional class implementation.
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</li>
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<li class="listitem">
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Andrei Alexandrescu and Brian Parker also worked with aligned storage techniques
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and their work influenced the current implementation.
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</li>
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<li class="listitem">
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Gennadiy Rozental made extensive and important comments which shaped the
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design.
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</li>
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<li class="listitem">
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Vesa Karvonen and Douglas Gregor made quite useful comparisons between
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optional, variant and any; and made other relevant comments.
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</li>
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<li class="listitem">
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Douglas Gregor and Peter Dimov commented on comparisons and evaluation
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in boolean contexts.
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</li>
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<li class="listitem">
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Eric Friedman helped understand the issues involved with aligned storage,
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move/copy operations and exception safety.
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</li>
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<li class="listitem">
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Many others have participated with useful comments: Aleksey Gurotov, Kevlin
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Henney, David Abrahams, and others I can't recall.
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</li>
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</ul></div>
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<h4>
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<a name="boost_optional.acknowledgements.h1"></a>
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<span class="phrase"><a name="boost_optional.acknowledgements.post_formal_review"></a></span><a class="link" href="acknowledgements.html#boost_optional.acknowledgements.post_formal_review">Post-formal
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review</a>
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</h4>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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William Kempf carefully considered the originally proposed interface and
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suggested the new interface which is currently used. He also started and
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fueled the discussion about the analogy optional<>/smart pointer
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and about relational operators.
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</li>
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<li class="listitem">
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Peter Dimov, Joel de Guzman, David Abrahams, Tanton Gibbs and Ian Hanson
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focused on the relational semantics of optional (originally undefined);
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concluding with the fact that the pointer-like interface doesn't make it
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a pointer so it shall have deep relational operators.
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</li>
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<li class="listitem">
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Augustus Saunders also explored the different relational semantics between
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optional<> and a pointer and developed the OptionalPointee concept
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as an aid against potential conflicts on generic code.
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</li>
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<li class="listitem">
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Joel de Guzman noticed that optional<> can be seen as an API on top
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of variant<T,nil_t>.
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</li>
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<li class="listitem">
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Dave Gomboc explained the meaning and usage of the Haskell analog to optional<>:
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the Maybe type constructor (analogy originally pointed out by David Sankel).
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</li>
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<li class="listitem">
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Other comments were posted by Vincent Finn, Anthony Williams, Ed Brey,
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Rob Stewart, and others.
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</li>
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<li class="listitem">
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Joel de Guzman made the case for the support of references and helped with
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the proper semantics.
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</li>
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<li class="listitem">
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Mat Marcus shown the virtues of a value-oriented interface, influencing
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the current design, and contributed the idea of "none".
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</li>
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<li class="listitem">
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Vladimir Batov's design of Boost.Convert library motivated the development
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of value accessors for <code class="computeroutput"><span class="identifier">optional</span></code>:
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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>.
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</li>
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</ul></div>
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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 © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014 Andrzej Krzemieński<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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