final Date settlement = index_.termStructure().currentLink().referenceDate();
final Date startDate = ((IborCoupon) flows.get(0)).fixingDate();
for (int i = 0; i < size_; ++i) {
final IborCoupon coupon = (IborCoupon) flows.get(i);
QL.require(coupon.date().eq(coupon.accrualEndDate()) , irregular_coupon_types); // QA:[RG]::verified // TODO: message
initialValues_.set(i, coupon.rate());
accrualPeriod_.set(i, coupon.accrualPeriod());
fixingDates_.set(i, coupon.fixingDate());