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28 Semantics -- Optional References</a>
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33<a name="reference_optional_ref_default_ctor"></a><div class="blockquote"><blockquote class="blockquote"><p>
34 <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&amp;&gt;::</span><span class="identifier">optional</span><span class="special">()</span>
35 <span class="keyword">noexcept</span><span class="special">;</span></code>
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37<div class="blockquote"><blockquote class="blockquote"><p>
38 <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>
39 </p></blockquote></div>
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41 <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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