 <code>false</code>, the value of <code>i</code> is equal to <code>limit</code>.</p>

<p><strong>See Also:</strong> <code>index(_:offsetBy:)</code>, <code>formIndex(_:offsetBy:limitedBy:)</code>
<strong>Complexity:</strong> O(1) if the collection conforms to
  <code>RandomAccessCollection</code>; otherwise, O(<em>n</em>), where <em>n</em> is the absolute
  value of <code>n</code>.</p>

    <h4>Declaration</h4>    
    <code class="language-swift">func formIndex(_ i: inout Self.Index, offsetBy n: Self.IndexD