ult_type</span> <a class="link" href="exponential_distribution.html#id-1_3_35_5_6_11_1_1_1_6_8-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Engine</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="exponential_distribution/param_type.html" title="Class param_type">param_type</a> <span class="special">&amp;</span><span