def test_insert_then_drop():
d1 = DummyEngine()
d2 = DummyEngine()
d3 = DummyEngine()
eng = MainEngine(backend=d3, engine_list=[d1])
assert d1.next_engine is d3
assert d2.next_engine is None
assert d3.next_engine is None
assert d1.main_engine is eng
assert d2.main_engine is None
assert d3.main_engine is eng
insert_engine(d1, d2)
assert d1.next_engine is d2
assert d2.next_engine is d3
assert d3.next_engine is None
assert d1.main_engine is eng
assert d2.main_engine is eng
assert d3.main_engine is eng
drop_engine_after(d1)
assert d1.next_engine is d3
assert d2.next_engine is None
assert d3.next_engine is None
assert d1.main_engine is eng
assert d2.main_engine is None
assert d3.main_engine is eng
def _send_cmd_with_mapped_ids(self, cmd):
"""
Send this Command using the mapped qubit ids of self.current_mapping.
If it is a Measurement gate, then it adds a LogicalQubitID tag.
Args:
cmd: Command object with logical qubit ids.
"""
new_cmd = deepcopy(cmd)
qubits = new_cmd.qubits
for qureg in qubits:
for qubit in qureg:
if qubit.id != -1:
qubit.id = self.current_mapping[qubit.id]
control_qubits = new_cmd.control_qubits
for qubit in control_qubits:
qubit.id = self.current_mapping[qubit.id]
if isinstance(new_cmd.gate, MeasureGate):
assert len(new_cmd.qubits) == 1 and len(new_cmd.qubits[0]) == 1
# Add LogicalQubitIDTag to MeasureGate
def add_logical_id(command, old_tags=deepcopy(cmd.tags)):
command.tags = (old_tags +
[LogicalQubitIDTag(cmd.qubits[0][0].id)])
return command
tagger_eng = CommandModifier(add_logical_id)
insert_engine(self, tagger_eng)
self.send([new_cmd])
drop_engine_after(self)
else:
self.send([new_cmd])