al">&lt;</span><span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">function</span><span class="special">(</span><span class="identifier">Allocator</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">auto</span> <span class="identifier">p</span> <span class="special">=</span> <span cla