Add a deprecation cycle for ArithmeticOp (quantumlib#5599)

quantumlib#4702 was started in November but did not get merged until May, which was after 14.1 went out. These deprecations need to be bumped to 0.16 instead of 0.15.

Once 0.15 goes out then I can reopen quantumlib#5579 and delete these.

Author: daxfohl

cirq/interop/quirk/cells/arithmetic_cells.py

@@ -35,7 +35,7 @@
     import cirq
 
 
-@deprecated_class(deadline='v0.15', fix='Use cirq.QuirkArithmeticGate')
+@deprecated_class(deadline='v0.16', fix='Use cirq.QuirkArithmeticGate')
 @value.value_equality
 class QuirkArithmeticOperation(ops.ArithmeticOperation):
     """Applies arithmetic to a target and some inputs.

cirq/ops/arithmetic_operation.py

@@ -29,7 +29,7 @@
 TSelf = TypeVar('TSelf', bound='ArithmeticOperation')
 
 
-@deprecated_class(deadline='v0.15', fix='Use cirq.ArithmeticGate')
+@deprecated_class(deadline='v0.16', fix='Use cirq.ArithmeticGate')
 class ArithmeticOperation(Operation, metaclass=abc.ABCMeta):
     """A helper class for implementing reversible classical arithmetic.
 

cirq/ops/arithmetic_operation_test.py

@@ -100,7 +100,7 @@ def with_registers(self, *new_registers):
         def apply(self, target_value, input_value):
             return target_value + input_value
 
-    with cirq.testing.assert_deprecated(deadline='v0.15', count=8):
+    with cirq.testing.assert_deprecated(deadline='v0.16', count=8):
         inc2 = Add(cirq.LineQubit.range(2), 1)
         np.testing.assert_allclose(cirq.unitary(inc2), shift_matrix(4, 1), atol=1e-8)
 
@@ -208,7 +208,7 @@ def with_registers(self, *new_registers):
         def apply(self, target_value, input_value):
             raise NotImplementedError()
 
-    with cirq.testing.assert_deprecated(deadline='v0.15', count=4):
+    with cirq.testing.assert_deprecated(deadline='v0.16', count=4):
         q0, q1, q2, q3, q4, q5 = cirq.LineQubit.range(6)
         op = Three([q0], [], [q4, q5])
         assert op.qubits == (q0, q4, q5)
@@ -238,7 +238,7 @@ def registers(self):
         def with_registers(self, *new_registers):
             raise NotImplementedError()
 
-    with cirq.testing.assert_deprecated(deadline='v0.15'):
+    with cirq.testing.assert_deprecated(deadline='v0.16'):
         state = np.ones(4, dtype=np.complex64) / 2
         output = cirq.final_state_vector(cirq.Circuit(Op1()), initial_state=state)
         np.testing.assert_allclose(state, output)