def haslayer(self, cls):
        """true if self has a layer that is an instance of cls. Superseded by "cls in self" syntax."""
        if self.__class__ == cls or self.__class__.__name__ == cls:
            return 1
        for f in self.packetfields:
            fvalue_gen = self.getfieldval(f.name)
            if fvalue_gen is None:
                continue
            if not f.islist:
                fvalue_gen = SetGen(fvalue_gen,_iterpacket=0)
            for fvalue in fvalue_gen:
                if isinstance(fvalue, Packet):
                    ret = fvalue.haslayer(cls)
                    if ret:
                        return ret
        return self.payload.haslayer(cls)
true if self has a layer that is an instance of cls. Superseded by "cls in self" syntax.