ss="identifier">p</span><span class="special">);</span> <span class="special">};</span>
<span class="keyword">auto</span> <span class="identifier">Q</span> <span class="special">=</span> <span class="identifier">integrator</span><span class="special">.</span><span class="identifier">integrate</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span> <span class="identifier">crossover</span><span class="special">,</span> <span class="identifier">constants</span><span