Context Manager: with flushing(MainEngine()) as eng:

[cclauss]

Simplify the creation, use, and flushing of any Engine using a Python context manager.

When exiting the with block, the engine is automatically flushed.

Just like auto-closing of files:

with open("my_file.txt") as in_file:
    print(in_file.read())

Modeled after https://docs.python.org/3/library/contextlib.html#contextlib.closing

from projectq import MainEngine, flushing  # import the main compiler engine
from projectq.ops import (
    H,
    Measure,
)  # import the operations we want to perform (Hadamard and measurement)

with flushing(MainEngine()) as eng:  # create a default compiler (the back-end is a simulator)
    qubit = eng.allocate_qubit()  # allocate a quantum register with 1 qubit

    H | qubit  # apply a Hadamard gate
    Measure | qubit  # measure the qubit

    # This line is no longer required... eng.flush()

print(f"Measured {int(qubit)}")  # converting a qubit to int or bool gives access to the measurement result

[coveralls]

Pull Request Test Coverage Report for Build 3310727324

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 3279663869:	0.0%
Covered Lines:	7301
Relevant Lines:	7301

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💛 - Coveralls

[Takishima]

Also, if you have not done so already, please send an email to info@projectq.ch to request the ProjectQ license agreement that you'll have to sign before we can merge this PR.

[cclauss]

% pytest

...
projectq/cengines/_withflushing_test.py ..                               [ 58%]
...

[Takishima]

Looks good to me. Now before I can merge this, I do need to have you sign the ProjectQ CLA.

EDIT: I just saw your email in the ProjectQ mailbox and the person responsible for it will contact you shortly.

[Takishima]

Thanks for the contribution!