Optional&lt;T&gt;</a></td>
<td>Encapsulates a value that may or may not be available.</td>
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<img src="../../GFX/PublicInterface.gif" alt="Public Interface" /></td>
<td><a href="../../Contents/1/249.html">IRef&lt;T&gt;</a></td>
<td>A mutable reference.</td>
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<img src="../../GFX/PublicInterface.gif" alt="Public Interface" /></td>
<td><a href="../../Contents/1/250.html">IResolvable&lt;T&gt;</a></td>
<td>A container for which you c