qiskit/dagcircuit/dagcircuit.py
def add_qreg(self, qreg):
        """Add all wires in a quantum register."""
        if not isinstance(qreg, QuantumRegister):
            raise DAGCircuitError("not a QuantumRegister instance.")
        if qreg.name in self.qregs:
            raise DAGCircuitError("duplicate register %s" % qreg.name)
        self.qregs[qreg.name] = qreg
        for j in range(qreg.size):
            self._add_wire((qreg, j))
def add_qreg(self, qreg):
        """Add all wires in a quantum register."""
        if not isinstance(qreg, QuantumRegister):
            raise DAGCircuitError("not a QuantumRegister instance.")
        if qreg.name in self.qregs:
            raise DAGCircuitError("duplicate register %s" % qreg.name)
        self.qregs[qreg.name] = qreg
        for j in range(qreg.size):
            self._add_wire((qreg, j))
Add all wires in a quantum register.