const auto r = d->class_rows_.find(make_pair(decc, a.format()));
if (r != d->class_rows_.end())
row_iter = d->rows_.find((*r).second);
const auto r = d->class_rows_.find(make_pair(decc, a.format()));
if (r != d->class_rows_.end())
row_iter = d->rows_.find((*r).second);