3</span>&#160;        };</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        <span class="keyword">template</span> &lt;&gt;</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="keyword">struct </span>at_c_impl&lt;2&gt; {</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;            <span class="keywo