name enable_if&lt; is_dynamic_buffer&lt; DynamicBuffer &gt;::value &gt;::type *  = 0);
</pre>
<p>
          This function is used to read a certain number of bytes of data from a
          stream. The call will block until one of the following conditions is true:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              The specified dynamic buffer sequence is full (that is, it has reached
              maximum size).
            </l