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classicalregister.py
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classicalregister.py
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# This code is part of Qiskit.
#
# (C) Copyright IBM 2017.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
# pylint: disable=bad-docstring-quotes
"""
Classical register reference object.
"""
import itertools
from qiskit.circuit.exceptions import CircuitError
from .register import Register
from .bit import Bit
class Clbit(Bit):
"""Implement a classical bit."""
__slots__ = ()
def __init__(self, register=None, index=None):
"""Creates a classical bit.
Args:
register (ClassicalRegister): Optional. A classical register containing the bit.
index (int): Optional. The index of the bit in its containing register.
Raises:
CircuitError: if the provided register is not a valid :class:`ClassicalRegister`
"""
if register is None or isinstance(register, ClassicalRegister):
super().__init__(register, index)
else:
raise CircuitError(
"Clbit needs a ClassicalRegister and %s was provided" % type(register).__name__
)
class ClassicalRegister(Register):
"""Implement a classical register."""
# Counter for the number of instances in this class.
instances_counter = itertools.count()
# Prefix to use for auto naming.
prefix = "c"
bit_type = Clbit