def __call__(self, sid):
return RoleContext(self._version, service_sid=self._solution['<STR_LIT>'], sid=sid, )<EOL>
Constructs a RoleContext

:param sid: The sid

:returns: twilio.rest.chat.v1.service.role.RoleContext
:rtype: twilio.rest.chat.v1.service.role.RoleContext