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  <div class="titlepage"><div><div><h1 style="clear: both"><code>bool operator==(const failure_type&lt;A, void&gt; &amp;) const</code></h1></div></div></div>
  <p>Returns true if this result is unsuccessful and its error compares equal to the error in the failure type sugar. Comparison is done using <code>operator==</code> on <code>error_type</code> and <code>A</code>. If <code>A</code> is <code>void</code>, thi