span class="identifier">tag</span><span class="special">::</span><span class="identifier">with_p_square_cumulative_distribution_median</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">accumulators</span><span class="special">::</span><span class="identifier">feature_of</span><span class="special">&lt;</span> <span class="identifier">tag</span><span class="spe