What does an exclamation mark in array index do?
<p>While perusing through my organization's source repository I came across this little gem:</p>

<pre><code>RawParameterStorage[!ParameterWorkingIdx][ParameterDataOffset] = ...
</code></pre>

<p>Is this valid code? (It compiles)  What does the exclamation mark here do?</p>

<p>An invert <code>~</code> operator might make sense, since it's commonly confused with the not <code>!</code> operator in boolean expressions.  However, it doesn't seem to make logical sense to impose the not <code>!</code> operator on an array index. Any Thoughts?</p>