)(</span> <span class="keyword">const</span> <span class="identifier">state_type</span> <span class="special">&amp;</span><span class="identifier">x</span> <span class="special">,</span> <span class="keyword">double</span> <span class="identifier">t</span> <span class="special">)</span>
    <span class="special">{</span>
        <span class="identifier">m_states</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span> <span class="identifier">x</span> <span