Well, the second cup of coffee solved it for me:

		CoWork co;
		for(int i=0;i<ICOUNT;i++){
			//co & [&, i] { operation(ib[i]); }; // Reference variant
			co & [&, i] { operationp(&ib[i]); }; // Pointer variant
		}
		co.Finish();

Must have 'copy capture' for i, or otherwise the index i will run away before used.

Sorry for bothering with such trivial issue.

Best regards,

Tom

CoWork co;
co & [&] {
   for(;;) {
      int i = co.GetNext();
      if(i >= ICOUNT) break;
      operationp(&ib[i]);
   }
}