   Determine the number of bytes available for reading.
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                <p>
                  <a class="link" href="basic_socket/basic_socket.html" title="basic_socket::basic_socket"><span class="bold"><strong>basic_socket</strong></span></a>
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                  Construct a basic_socket without opening it. <br> <span class="silver"> &#8212;</span><br> Construct
                  and open 