Annotation-based decorator for `ctypes` function pointers

[ZeroIntensity]

Feature or enhancement

Proposal:

The idea is to add a decorator that extracts type annotations and a name for a function signature, and then use that information to generate argtypes and restype for a _CFuncPtr object. For example:

@wrap_dll_function(ctypes.pythonapi)
def PyObject_GetAttrString(op: ctypes.py_object, attr: ctypes.c_char_p) -> ctypes.py_object:
    ...

See #104533 for prior work.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/annotation-based-sugar-for-ctypes/26579

Linked PRs

• gh-153903: Add a ctypes decorator for generating function pointers using annotations #153904
• gh-153903: Use @ctypes.util.wrap_dll_function() with pythonapi #154030
• gh-153903: Fix ctypes wrap_dll_function() with string annotations #154042
• gh-153903: Use @ctypes.util.wrap_dll_function() #154122