gh-107538: [Enum] fix handling of inverted/negative values #132273
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For example:
class Flag(enum.Flag):
A = 0x01
B = 0x02
MASK = 0xff
~Flag.MASK is Flag(0)
IntFlag will flip all bits -- this only makes a difference in flag sets with missing values.
negative values are no longer used as-is, but become inverted; i.e.
class Y(self.enum_type):
A = auto()
B = auto()
C = ~A # aka ~1 aka 0b1 110 (from enum.bin()) aka 6
D = auto()
assert Y.C. is Y.B|Y.D
| @@ -0,0 +1 @@ | |||
| Fix flag mask inversion when unnamed flags exist. | |||
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correct Flag inversion to only flip flag bits; IntFlag still flips all bits -- this
only makes a difference in flag sets with missing values.
correct negative assigned values in flags; negative values are no longer
used as-is, but become inverted; i.e.