ther
a <code>Class</code> object or an <code>NSString</code> containing the name of an Objective-C class.
If the specified class responds to the selector <code>instance</code>, this function
returns that instance.</p>

<h4>Expression usage</h4>

<pre><code>^singleton(MBServiceManager)
</code></pre>

<p>The expression above would return the singleton instance of the
<code>MBServiceManager</code> class.</p>
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