e type requirements for <span class="bold"><strong><code class="computeroutput"><span class="identifier">NextLayer</span></code></strong></span> are already
                    familiar to users as they are documented in Asio: <a href="../../../../../../doc/html/boost_asio/reference/AsyncReadStream.html" target="_top"><span class="emphasis"><em>AsyncReadStream</em></span></a>,
                    <a href="../../../../../../doc/html/boost_asio/reference/AsyncWriteStream.html" target="_top"><span class="empha