ll be between -2<sup>63</sup> and 2<sup>63</sup> - 1,
inclusive.</p>
<p>Throws <a href="dart-core/RangeError-class.html">RangeError</a> if <code>byteOffset</code> is negative, or
<code>byteOffset + 8</code> is greater than the length of this object.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">int getInt64(int byteOffset, [Endian endian = Endian.big]);</code></pre>
    </s