t</span> <span class="identifier">DomainT</span> <span class="special">&amp;</span> val<span class="special">)</span><span class="special">;</span></pre>
<p>Constructor for a closed singleton interval <code class="computeroutput">[val,val]</code> </p>
</li>
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<pre class="literallayout"><a name="idp40123536-bb"></a><span class="identifier">discrete_interval</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">DomainT</span> <span class="special">