pan class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="memory_resource.html#idp39172416-bb">protected member functions</a></span>
  <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="special">*</span> <a class="link" href="memory_resource.html#idp39172992-bb"><span class="identifier">do_allocate</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="id