utput">x</code></span></p></td>
<td><p>The state of the ODE which should be solved. After calling do_step the result is updated in x. </p></td>
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<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> System<span class="special">,</span> <span class="keyword">typename</span> StateIn<span class="special">,</span> <span class="keyword">typena