n class="special">==</span><span class="number">1</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">b</span><span class="special">==</span><span class="number">3</span><span class="special">);</span>
</pre>
<h6>
<a name="boost_optional.tutorial.optional_references.rebinding_semantics_for_assignment_of_optional_references.h0"></a>
          <span class="phrase"><a name="boost_optional.tutorial.optional_references.rebinding_seman