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<title>Empty</title>
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<p class="Decl"><b>function</b> Empty: Boolean; <b>virtual</b>; <strong>abstract</strong>; </p>
<h2>Description</h2>
<p class="Body">Shall return <i>True</i> if the back-end is empty. Subclasses have to implement this method to indicate whether they are empty depending on their internal state.<br>
By design back-ends do not need to save the size of the allo