 class="special">::</span><span class="identifier">enable_if_c</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special">&lt;</span> <span class="identifier">RandomAccessIter</span> <span class="special">&gt;</s