def with_function_wrapping(obj: typing.Any, function_field: str, /) -> None:
"""Utility function for making an object wrap a function at runtime.
Parameters
----------
obj : typing.Any
The initialised object to update the wrapping information for.
function_field : str
The name of the attribute which is being wrapped. This should point to a
function.
"""
obj.__annotations__ = getattr(obj, function_field).__annotations__
# For the sake of presenting as the right signature the objects this will be applied to should pre-define
# their own __call__ method which assumes "self" is already bound to the contained function.
obj.__call__ = types.MethodType(
lambda self, *args, **kwargs: getattr(self, function_field)
(*args, **kwargs), obj)
obj.__doc__ = getattr(obj, function_field).__doc__
obj.__module__ = getattr(obj, function_field).__module__
obj.__wrapped__ = getattr(obj, function_field)
