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depth.py
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depth.py
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# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2019.
#
# 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.
"""Calculate the depth of a DAG circuit."""
from qiskit.transpiler.basepasses import AnalysisPass
class Depth(AnalysisPass):
"""Calculate the depth of a DAG circuit."""
def __init__(self, *, recurse=False):
"""
Args:
recurse: whether to allow recursion into control flow. If this is ``False`` (default),
the pass will throw an error when control flow is present, to avoid returning a
number with little meaning.
"""
super().__init__()
self.recurse = recurse
def run(self, dag):
"""Run the Depth pass on `dag`."""
self.property_set["depth"] = dag.depth(recurse=self.recurse)