/span> <span class="keyword">void</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> 
    <a class="link" href="runge_kutta4_classic.html#idp20661200-bb"><span class="identifier">do_step</span></a><span class="special">(</span><span class="identifier">System</span><span class="special">,</span> <span class="identifier">StateInOut</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="ide