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import unittest
import test.support
from ctypes import *
class AnonTest(unittest.TestCase):
def test_anon(self):
class ANON(Union):
_fields_ = [("a", c_int),
("b", c_int)]
class Y(Structure):
_fields_ = [("x", c_int),
("_", ANON),
("y", c_int)]
_anonymous_ = ["_"]
self.assertEqual(Y.a.offset, sizeof(c_int))
self.assertEqual(Y.b.offset, sizeof(c_int))
self.assertEqual(ANON.a.offset, 0)
self.assertEqual(ANON.b.offset, 0)
def test_anon_nonseq(self):
# TypeError: _anonymous_ must be a sequence
self.assertRaises(TypeError,
lambda: type(Structure)("Name",
(Structure,),
{"_fields_": [], "_anonymous_": 42}))
def test_anon_nonmember(self):
# AttributeError: type object 'Name' has no attribute 'x'
self.assertRaises(AttributeError,
lambda: type(Structure)("Name",
(Structure,),
{"_fields_": [],
"_anonymous_": ["x"]}))
@test.support.cpython_only
def test_issue31490(self):
# There shouldn't be an assertion failure in case the class has an
# attribute whose name is specified in _anonymous_ but not in _fields_.
# AttributeError: 'x' is specified in _anonymous_ but not in _fields_
with self.assertRaises(AttributeError):
class Name(Structure):
_fields_ = []
_anonymous_ = ["x"]
x = 42
def test_nested(self):
class ANON_S(Structure):
_fields_ = [("a", c_int)]
class ANON_U(Union):
_fields_ = [("_", ANON_S),
("b", c_int)]
_anonymous_ = ["_"]
class Y(Structure):
_fields_ = [("x", c_int),
("_", ANON_U),
("y", c_int)]
_anonymous_ = ["_"]
self.assertEqual(Y.x.offset, 0)
self.assertEqual(Y.a.offset, sizeof(c_int))
self.assertEqual(Y.b.offset, sizeof(c_int))
self.assertEqual(Y._.offset, sizeof(c_int))
self.assertEqual(Y.y.offset, sizeof(c_int) * 2)
if __name__ == "__main__":
unittest.main()
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