ier">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><span class="identifier">endl</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> 