>
<span class="n">executor</span><span class="p">.</span><span class="n">async</span><span class="p">([</span><span class="n">i</span><span class="o">=</span><span class="mi">4</span><span class="p">](</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">&lt;&lt;</span><span class="w"> </span><span class="n">std<