code> iff the <code>Interval</code> is empty.</p>

    <h4>Declaration</h4>    
    <code class="language-swift">var isEmpty: Bool { get }</code>

    </div></div>
</div>
<div class="declaration" id="var-start_-bound">
<a class="toggle-link" data-toggle="collapse" href="#comment-var-start_-bound">var start: Bound</a><div class="comment collapse" id="comment-var-start_-bound"><div class="p">
    <p>The <code>Interval</code>&#39;s lower bound.</p>

<p>Invariant: <code>start</code> &lt;= <code>end</code>.</p>
