an>     

  <span class="comment">// <a class="link" href="runge_kutta4_classic.html#boost.numeric.odeint.runge_kutta4_classicconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="runge_kutta4_classic.html#idp20682096-bb"><span class="identifier">runge_kutta4_classic</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">algebra_type</span> <span class="special">&amp;</span> <span class="special">=</span> <span class="identifier">alg