><span class="special">;</span></pre>Return value for index argument. <p>Throws <code class="computeroutput">std::out_of_range</code> if the index is out of bounds.</p>
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<pre class="literallayout"><span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <a name="idm14177-bb"></a><span class="identifier">bin</span><span class="special">(</span><span class="identifier">index_type</span> idx<span class="special