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Base class for protocol classes. Protocol classes are defined as::
cirq.transformers.TRANSFORMER(
*args, **kwargs
)
class Proto(Protocol):
def meth(self) -> int:
...
Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing), for example::
class C:
def meth(self) -> int:
return 0
def func(x: Proto) -> int:
return x.meth()
func(C()) # Passes static type check
See PEP 544 for details. Protocol classes decorated with @typing_extensions.runtime act as simple-minded runtime protocol that checks only the presence of given attributes, ignoring their type signatures.
Protocol classes can be generic, they are defined as::
class GenProto(Protocol[T]):
def meth(self) -> T:
...
Methods
__call__
__call__(
circuit: 'cirq.AbstractCircuit',
*,
context: Optional[cirq.transformers.TransformerContext] = None
) -> 'cirq.AbstractCircuit'
Call self as a function.