ClassicalRegister
class qiskit.circuit.ClassicalRegister(size=None, name=None, bits=None)
Bases: Register
Implement a classical register.
Create a new generic register.
Either the size or the bits argument must be provided. If size is not None, the register will be pre-populated with bits of the correct type.
Parameters
- size (int) – Optional. The number of bits to include in the register.
- name (str) – Optional. The name of the register. If not provided, a unique name will be auto-generated from the register type.
- bits (list[Bit]) – Optional. A list of Bit() instances to be used to populate the register.
Raises
- CircuitError – if both the
sizeandbitsarguments are provided, or if neither are. - CircuitError – if
sizeis not valid. - CircuitError – if
nameis not a valid name according to the OpenQASM spec. - CircuitError – if
bitscontained duplicated bits. - CircuitError – if
bitscontained bits of an incorrect type.
Attributes
instances_counter
Default value: count(0)
name
Get the register name.
name_format
Default value: re.compile('[a-z][a-zA-Z0-9_]*')
prefix
Default value: 'c'
size
Get the register size.
Methods
index
index(bit)
Find the index of the provided bit within this register.
qasm
qasm()
Return OPENQASM string for this register.
The method qiskit.circuit.classicalregister.ClassicalRegister.qasm() is deprecated as of qiskit-terra 0.23.0. It will be removed in the Qiskit 1.0 release. Correct exporting to OpenQASM 2 is the responsibility of a larger exporter; it cannot safely be done on an object-by-object basis without context. No replacement will be provided, because the premise is wrong.