Help with bit-field semantics in C and C++

[Andreas Schwab]

Michael Matz <matz@suse.de> writes:

> In this case I think the C++ standard should be changed in a way to not 
> require a masking operation for each and every assignment from an integer 
> of which the range is unknown.  Yes this masking happens only for such 
> casts, and not for every operation if the operands are enums already, but 
> it still will hurt performance in the real world.

Do you think that assignments from non-enum to enum are frequent
operations in C++?  I don't think so.  The explicit cast also suggests
that the conversion may not be a nop.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."