al">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
    <span class="keyword">struct</span>  <span class="identifier">test7</span> <span class="special">{</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="identifier">T</span> <span class="keyword">operator</span><span class="special">()(</span><span c