Le mercredi 20 juin 2007 à 15:14 +0300, Nikolaos Kavvadias a écrit :
My question is if it is meaningful (it is for the analysis in mind:) to
It usually is.
implement a SELECT operator that works on intervals. The SELECT operation would be:
-> src1, if cond!=0 dst <= | | -> src2, if cond=0
Generally, you have to add a third branch when you can't decide whether cond == 0 or cond != 0 (in case cond is not degenerate yet it contains zero). This third branch will store hull(src1, src2) into dst.
Or better, is it already there, build in the "interval" numeric sublibrary?
No, there is no such operator. But it is not difficult to implement. The code would look like if (cerne(cond, 0)) dst = src1; else if (cereq(cond, 0)) dst = src2; else dst = hull(src1, src2); ("cer" means "certainly", available in compare/explicit.hpp) Best regards, Guillaume