t-cpp"><div class="highlight"><pre><span></span><span class="k">auto</span> <span class="n">r</span> <span class="o">=</span> <span class="n">flow</span><span class="p">(</span>
    <span class="n">filter</span><span class="p">([](</span><span class="kt">int</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">x</span> <span class="o">&gt;</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}),</span>
    <span cl