Function UpdateValidHistory

src/misc/history.cpp:25–38

* Update mask of valid records for a historical data. * @note Call only for the largest history range sub-division. * @param[in,out] valid_history Valid history records. * @param hr History range to update mask for. * @param cur_month Current economy month. */

 * @param cur_month Current economy month.
 */
void UpdateValidHistory(ValidHistoryMask &valid_history, const HistoryRange &hr, uint cur_month)
{
	/* Update for subdivisions first. */
	if (hr.hr != nullptr) UpdateValidHistory(valid_history, *hr.hr, cur_month);

	/* No need to update if our last entry is marked valid. */
	if (HasBit(valid_history, hr.last - 1)) return;
	/* Is it the right time for this history range? */
	if (cur_month % hr.total_division != 0) return;
	/* Is the previous history range valid yet? */
	if (hr.division != 1 && !HasBit(valid_history, hr.first - hr.division)) return;

	SB(valid_history, hr.first, hr.records, GB(valid_history, hr.first, hr.records) << 1ULL | 1ULL);
}

/**
 * Test if history data is valid, without extracting data.