And you can find more here:
http://stackoverflow.com/questions/248693/double-negation-in-c-code


On Mon, Oct 21, 2013 at 5:20 PM, Nav Kamal [off-list ref] wrote:

I cam across a line which goes like this :

#define likely(condition) (__builtin__ expect (!!(condition),1))

Please somebody explain the double negation used in this macro.

Regards
Navkamal Rakra

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Le?nidas S. Barbosa (Kirotawa)
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