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 size and bits arguments are provided, or if neither are.
• CircuitError – if size is not valid.
• CircuitError – if name is not a valid name according to the OpenQASM spec.
• CircuitError – if bits contained duplicated bits.
• CircuitError – if bits contained bits of an incorrect type.

Attributes

instances_counter

name

prefix

size

Methods

index