gn="left">Note</th>
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<tr><td align="left" valign="top"><p>Returns a null pointer if the format is not found </p></td></tr>
</table></div>
<p>
</p>
<p><b>Since Boost 1.67 .&#160;</b></p>
<p>
</p>
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<pre class="literallayout"><span class="keyword">void</span> <a name="idp59911024-bb"></a><span class="identifier">set_threshold_level</span><span class="special">(</span><span class="identifier">log_level</span><span class="special">)</span><span class="special">;</span></pre>Sets t