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| 29 | <div class="toc"><dl class="toc"> | |
| 30 | <dt><span class="section"><a href="reference.html#boost_optional.reference.header__boost_none_hpp_">Header | |
| 31 | <boost/none.hpp></a></span></dt> | |
| 32 | <dt><span class="section"><a href="../boost_optional/reference/header__boost_optional_bad_optional_access_hpp_.html">Header | |
| 33 | <boost/optional/bad_optional_access.hpp></a></span></dt> | |
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| 36 | <boost/optional/optional_fwd.hpp></a></span></dt> | |
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| 40 | <boost/optional.hpp></a></span></dt> | |
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| 43 | <div class="titlepage"><div><div><h3 class="title"> | |
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| 45 | <boost/none.hpp></a> | |
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| 49 | <a name="boost_optional.reference.header__boost_none_hpp_.synopsis"></a><a class="link" href="reference.html#boost_optional.reference.header__boost_none_hpp_.synopsis" title="Synopsis">Synopsis</a> | |
| 50 | </h4></div></div></div> | |
| 51 | <p> | |
| 52 | </p> | |
| 53 | <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> | |
| 54 | ||
| 55 | <span class="keyword">class</span> <span class="identifier">none_t</span> <span class="special">{/*</span> <span class="identifier">see</span> <span class="identifier">below</span> <span class="special">*/};</span> | |
| 56 | ||
| 57 | <span class="keyword">const</span> <span class="identifier">none_t</span> <span class="identifier">none</span> <span class="special">(/*</span> <span class="identifier">see</span> <span class="identifier">below</span> <span class="special">*/);</span> | |
| 58 | ||
| 59 | <span class="special">}</span> <span class="comment">// namespace boost</span> | |
| 60 | </pre> | |
| 61 | <p> | |
| 62 | </p> | |
| 63 | <p> | |
| 64 | Class <code class="computeroutput"><span class="identifier">none_t</span></code> is meant to | |
| 65 | serve as a tag for selecting appropriate overloads of from <code class="computeroutput"><span class="identifier">optional</span></code>'s interface. It is an empty, | |
| 66 | trivially copyable class with disabled default constructor. | |
| 67 | </p> | |
| 68 | <p> | |
| 69 | Constant <code class="computeroutput"><span class="identifier">none</span></code> is used to | |
| 70 | indicate an optional object that does not contain a value in initialization, | |
| 71 | assignment and relational operations of <code class="computeroutput"><span class="identifier">optional</span></code>. | |
| 72 | </p> | |
| 73 | </div> | |
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| 76 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 77 | <td align="left"></td> | |
| 78 | <td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2016 Andrzej Krzemieński<p> | |
| 79 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 80 | 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>) | |
| 81 | </p> | |
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