r">is_sync_write_stream</span></code>,
          <code class="computeroutput"><span class="identifier">is_async_stream</span></code>, <code class="computeroutput"><span class="identifier">is_async_read_stream</span></code>, and <code class="computeroutput"><span class="identifier">is_async_write_stream</span></code> are in stream_traits.hpp.
          <span class="emphasis"><em>Actions Required</em></span>: Include stream_traits.hpp as needed.
        </li>
<li class="listitem">
          <code class="compu