mirror of https://github.com/Qiskit/qiskit.git
13 lines
600 B
YAML
13 lines
600 B
YAML
---
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fixes:
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- |
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Previously it was possible to set the number of control qubits to zero in
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which case the the original, potentially non-controlled, operation would be
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returned. This could cause an ``AttributeError`` to be raised if the caller
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attempted to access an attribute which only
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:class:`~qiskit.circuit.ControlledGate` object have. This has been fixed
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by adding a getter and setter for
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:attr:`~qiskit.circuit.ControlledGate.num_ctrl_qubits` to validate
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that a valid value is being used.
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Fixes `#4576 <https://github.com/Qiskit/qiskit-terra/issues/4576>`__
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