I think a longer-named decorator, with a name that actually
describes its behavior would be better than any smart short name
in this case.

"check_all_bits_defined" or something along it. 

On Fri, 28 May 2021 at 18:30, Ethan Furman <ethan@stoneleaf.us> wrote:
On 5/28/21 12:43 AM, Petr Viktorin wrote:
 > On 28. 05. 21 5:24, Ethan Furman wrote:

 >>      class FlagWithMasks(IntFlag):
 >>          DEFAULT = 0x0
 >>
 >>          FIRST_MASK = 0xF
 >>          FIRST_ROUND = 0x0
 >>          FIRST_CEIL = 0x1
 >>          FIRST_TRUNC = 0x2
 >>
 >>          SECOND_MASK = 0xF0
 >>          SECOND_RECALC = 0x00
 >>          SECOND_NO_RECALC = 0x10
 >>
 >>          THIRD_MASK = 0xF00
 >>          THIRD_DISCARD = 0x000
 >>          THIRD_KEEP = 0x100
 >>
 >> Here we have three flags (FIRST_MASK, SECOND_MASK, THIRD_MASK) that are aliasing values
 >> that don't exist, but it seems intentional and not an error.
 >
 > Are you looking for a decorator for the whole Enum, or a way to mark individual *values* as masks?

The decorator is for whole enum.  The issue is not that some values are masks, but whether the absence of named bits
covered by the mask is an error.

--
~Ethan~
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