lf.html" title="Struct _self">_self</a></pre>
<p>The placeholder representing the iterator. </p>
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<pre class="literallayout"><span class="keyword">typename</span> Reference <span class="special">=</span> <span class="special">::</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">use_default</span></pre>
<p>The reference type. If it is boost::use_default, then reference will be value_type&amp;. </p>
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