 class="special">(</span><span class="identifier">it</span><span class="special">-&gt;</span><span class="identifier">second</span><span class="special">),</span> <span class="identifier">expr</span><span class="special">::</span><span class="identifier">stream</span><span class="special">,</span> <span class="identifier">expr</span><span class="special">::</span><span class="identifier">attr</span><span class="special">&lt;</span> <span class="identifier">point</span> <span class="special">&gt;(</span><spa