" title="Class permissions">permissions</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="permissions.html#idm46093042793136-bb">friend functions</a></span>
  <span class="keyword">friend</span> <span class="keyword">void</span> <a class="link" href="permissions.html#idm46093042792576-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link"