Function monthCmp

pj_widgets/src/DateRangePicker.cpp:561–572

Signed month comparison. Returns 0 for an invalid date.

namespace {
// Signed month comparison. Returns 0 for an invalid date.
int monthCmp(const QDate& d, int year, int month) {
  if (!d.isValid()) {
    return 0;
  }
  if (d.year() != year) {
    return (d.year() < year) ? -1 : +1;
  }
  if (d.month() != month) {
    return (d.month() < month) ? -1 : +1;
  }
  return 0;
}
}  // namespace

void DualCalendarWidget::advanceMonth(int& year, int& month, int delta) {