span class="special">*</span> <span class="keyword">const</span> <span class="identifier">block</span><span class="special">)</span>
  <span class="special">{</span> <span class="keyword">delete</span> <span class="special">[]</span> <span class="identifier">block</span><span class="special">;</span> <span class="special">}</span>
<span class="special">};</span>

<span class="keyword">struct</span> <span class="identifier">default_user_allocator_malloc_free</span>
<span class="special">{</span>
  <span clas