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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
+<title>Reference</title>
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+<a name="optional.reference"></a><a class="link" href="reference.html" title="Reference">Reference</a>
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+<dt><span class="section"><a href="reference.html#boost_optional.reference.header__boost_none_hpp_">Header
+ <boost/none.hpp></a></span></dt>
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+ <boost/optional/bad_optional_access.hpp></a></span></dt>
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+<dt><span class="section"><a href="../boost_optional/reference/header__boost_optional_optional_fwd_hpp_.html">Header
+ <boost/optional/optional_fwd.hpp></a></span></dt>
+<dt><span class="section"><a href="reference/header__boost_optional_optional_hpp_.html">Header
+ <boost/optional/optional.hpp></a></span></dt>
+<dt><span class="section"><a href="../boost_optional/reference/header__boost_optional_hpp_.html">Header
+ <boost/optional.hpp></a></span></dt>
+</dl></div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="boost_optional.reference.header__boost_none_hpp_"></a><a class="link" href="reference.html#boost_optional.reference.header__boost_none_hpp_" title="Header <boost/none.hpp>">Header
+ <boost/none.hpp></a>
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+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<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>
+</h4></div></div></div>
+<p>
+</p>
+<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
+
+<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>
+
+<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>
+
+<span class="special">}</span> <span class="comment">// namespace boost</span>
+</pre>
+<p>
+ </p>
+<p>
+ Class <code class="computeroutput"><span class="identifier">none_t</span></code> is meant to
+ 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,
+ trivially copyable class with disabled default constructor.
+ </p>
+<p>
+ Constant <code class="computeroutput"><span class="identifier">none</span></code> is used to
+ indicate an optional object that does not contain a value in initialization,
+ assignment and relational operations of <code class="computeroutput"><span class="identifier">optional</span></code>.
+ </p>
+</div>
+</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 © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2018 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>)
+ </p>
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