span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;cassert&gt;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&lt;vector&gt;</span><span class="cp"></span>

<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
    <span class="k">auto</span> <span class="n">v</span> <span class="o">=</span> <span class="n">boost</span><span class="o">::</span><span class="n">hof</span><span class="o">::