nested foreeach_bit loops

[Matthias Kretz]

Hi Igor,

On Tuesday 02 October 2012 08:58:40 Kulakov, Igor wrote:
> I use nested foreach_bit, everything seems to be working properly, but I get
> warnings.
> 
> /Users/ikulakov/Work/HFT/work/code/AliHLTTPCCAGBTracker.cxx:1294:9: warning:
> declaration of '_Vc_foreach_bit_helper' shadows a previous local [-Wshadow]
> /Users/ikulakov/Work/HFT/work/code/AliHLTTPCCAGBTracker.cxx:1286:5:
> warning: shadowed declaration is here [-Wshadow]
> 
> Am I doing something wrong? Can this be fixed?

You're doing it right. It's a "bug" in Vc. It can be fixed in Vc so that the 
internal variable name includes the line number. Then you'd only get those 
warnings if you do

foreach_bit(int a, mask1) { foreach_bit(int b, mask2) {
 ...
} }

I.e. more than one foreach_bit call in a single line of code. If you want to 
try and fix it - all you need is the CAT macros and __LINE__ to add the 
linenumber to the _Vc_foreach_bit_helper. I'll put it on the list of issues 
for Vc 0.7.

BTW, please just send mails to vc-devel, no need to CC me explicitly.

Cheers,
	Matthias
-- 
Dipl.-Phys. Matthias Kretz

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