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gh-125783: Add more tests to prevent regressions with the combination of ctypes and metaclasses. (GH-126126)
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‎Lib/test/test_ctypes/test_c_simple_type_meta.py

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@@ -85,3 +85,68 @@ class Sub(CtBase):
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self.assertIsInstance(POINTER(Sub), p_meta)
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self.assertTrue(issubclass(POINTER(Sub), Sub))
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def test_creating_pointer_in_dunder_init_1(self):
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class ct_meta(type):
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def __init__(self, name, bases, namespace):
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super().__init__(name, bases, namespace)
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# Avoid recursion.
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# (See test_creating_pointer_in_dunder_new_1)
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if bases == (c_void_p,):
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return
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if issubclass(self, PtrBase):
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return
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if bases == (object,):
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ptr_bases = (self, PtrBase)
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else:
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ptr_bases = (self, POINTER(bases[0]))
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p = p_meta(f"POINTER({self.__name__})", ptr_bases, {})
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ctypes._pointer_type_cache[self] = p
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class p_meta(PyCSimpleType, ct_meta):
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pass
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class PtrBase(c_void_p, metaclass=p_meta):
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pass
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class CtBase(object, metaclass=ct_meta):
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pass
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class Sub(CtBase):
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pass
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class Sub2(Sub):
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pass
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self.assertIsInstance(POINTER(Sub2), p_meta)
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self.assertTrue(issubclass(POINTER(Sub2), Sub2))
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self.assertTrue(issubclass(POINTER(Sub2), POINTER(Sub)))
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self.assertTrue(issubclass(POINTER(Sub), POINTER(CtBase)))
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def test_creating_pointer_in_dunder_init_2(self):
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class ct_meta(type):
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def __init__(self, name, bases, namespace):
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super().__init__(name, bases, namespace)
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# Avoid recursion.
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# (See test_creating_pointer_in_dunder_new_2)
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if isinstance(self, p_meta):
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return
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p = p_meta(f"POINTER({self.__name__})", (self, c_void_p), {})
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ctypes._pointer_type_cache[self] = p
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class p_meta(PyCSimpleType, ct_meta):
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pass
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class Core(object):
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pass
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class CtBase(Core, metaclass=ct_meta):
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pass
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class Sub(CtBase):
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pass
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self.assertIsInstance(POINTER(Sub), p_meta)
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self.assertTrue(issubclass(POINTER(Sub), Sub))

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