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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> I was thinking about how to better implement it, and did not find a
> better solution.

A bitmask? Then you would have

FOREACH(.. b,...){
	// skip bodies with non-matching groupMask if mask is non-zero
	// otherwise use all bodies
	if(mask!=0 && (b->groupMask & mask)==0) continue;
	/* do stuff here */
}

Just a suggestion.

v