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<a name="boost_optional.reference.header__boost_optional_optional_hpp_.detailed_semantics____optional_references"></a><a class="link" href="detailed_semantics____optional_references.html" title="Detailed Semantics -- Optional References">Detailed
        Semantics -- Optional References</a>
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<a name="reference_optional_ref_default_ctor"></a><div class="blockquote"><blockquote class="blockquote"><p>
            <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&amp;&gt;::</span><span class="identifier">optional</span><span class="special">()</span>
            <span class="keyword">noexcept</span><span class="special">;</span></code>
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<div class="blockquote"><blockquote class="blockquote"><p>
            <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&amp;&gt;::</span><span class="identifier">optional</span><span class="special">(</span><span class="identifier">none_t</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></code>
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              <span class="bold"><strong>Postconditions:</strong></span> <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> refers to nothing.
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<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
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