>.<br>
<b>Complexity:</b> Constant.<br>
</blockquote>

<code>template&lt;typename Tag> typename index&lt;Tag>::type&amp; get()noexcept;</code>

<blockquote>
<b>Requires:</b> <code>Tag</code> is such that <code>index&lt;Tag>::type</code>
is valid.<br>
<b>Effects:</b> Returns a reference to the
<code>index&lt;Tag>::type</code> index held by
<code>*this</code>.<br>
<b>Complexity:</b> Constant.<br>
</blockquote>

<code>template&lt;typename Tag> const typename index&lt;Tag>::type&amp; get()const noexcept;</code>