Function CheckBridgeAvailability

src/tunnelbridge_cmd.cpp:240–257

* Is a bridge of the specified type and length available? * @param bridge_type Wanted type of bridge. * @param bridge_len Wanted length of the bridge. * @param flags Type of operation. * @return A succeeded (the requested bridge is available) or failed (it cannot be built) command. */

 * @return A succeeded (the requested bridge is available) or failed (it cannot be built) command.
 */
CommandCost CheckBridgeAvailability(BridgeType bridge_type, uint bridge_len, DoCommandFlags flags)
{
	if (flags.Test(DoCommandFlag::QueryCost)) {
		if (bridge_len <= _settings_game.construction.max_bridge_length) return CommandCost();
		return CommandCost(STR_ERROR_BRIDGE_TOO_LONG);
	}

	if (bridge_type >= MAX_BRIDGES) return CMD_ERROR;

	const BridgeSpec *b = GetBridgeSpec(bridge_type);
	if (b->avail_year > TimerGameCalendar::year) return CMD_ERROR;

	uint max = std::min(b->max_length, _settings_game.construction.max_bridge_length);

	if (b->min_length > bridge_len) return CMD_ERROR;
	if (bridge_len <= max) return CommandCost();
	return CommandCost(STR_ERROR_BRIDGE_TOO_LONG);
}

/**
 * Calculate the base cost of clearing a tunnel/bridge per tile.