<span class="special">&lt;&lt;</span> <span class="string">"calc(int)  : "</span> <span class="special">&lt;&lt;</span> <span class="special">(</span><span class="identifier">inst</span><span class="special">.*</span><span class="identifier">calc_f</span><span class="special">)(</span><span class="number">5</span><span class="special">,</span>   <span class="number">2</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span>