{}
<a name="l00495"></a>00495 
<a name="l00496"></a>00496         result_type operator()(argument_type srcP)<span class="keyword"> const </span>{ 
<a name="l00497"></a>00497             <span class="keywordflow">return</span> result_type(at_c&lt;K&gt;(srcP)); 
<a name="l00498"></a>00498         }
<a name="l00499"></a>00499     };
<a name="l00500"></a>00500 
<a name="l00501"></a>00501     <span class="keyword">template</span> &lt;<span class="keywordtype">int</span> K, <span class="keyword">typename</span> V