</span> <a class="link" href="../boost/logic/indeterminate.html" title="Function indeterminate"><span class="identifier">indeterminate</span></a><span class="special">(</span><a class="link" href="../boost/logic/tribool.html" title="Class tribool">tribool</a><span class="special">,</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <span class="special">=</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span><span class="special">)</s