Meador Inge added the comment:
OK, I finally had some time to look at this. The attached patch does fix the
issue. However, it has a nasty side effect in that the encoded bitfield size
stays with the field member object:
>>> class SubByte(c_ubyte): pass
...
>>> class A(Structure):
... _fields_ = [("x", SubByte, 5)]
...
>>> sizeof(A().x)
327680
Before the patch things look like:
>>> class SubByte(c_ubyte): pass
...
>>> class A(Structure):
... _fields_ = [("x", SubByte, 5)]
...
>>> sizeof(A().x)
1
Leaking the internal bitfield size encoding seems like a deal breaker to me.
----------
type: -> behavior
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Python tracker <[email protected]>
<http://bugs.python.org/issue15459>
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