code: public java.lang.String getMember() {
      java.lang.Object ref = member_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        member_ = s;
        return s;
      }
    }
docs: <pre>
  A single identity requesting access for a Cloud Platform resource.
  Follows the same format of Binding.members.
  Required
  </pre>
  
  <code>string member = 3;</code>