sync_base</span></code>,
          <code class="computeroutput"><span class="identifier">stable_async_base</span></code>
          <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
                Handle boilerplate for writing composed operations
              </li>
<li class="listitem">
                New <code class="computeroutput"><span class="identifier">allocate_stable</span></code>
                is preferred over <code class="computeroutpu