Function CmdCreateSubsidy

src/subsidy.cpp:196–230

* Create a new subsidy. * @param flags type of operation * @param cargo_type CargoType of subsidy. * @param src Source. * @param dst Destination. * @return the cost of this operation or an error */

 * @return the cost of this operation or an error
 */
CommandCost CmdCreateSubsidy(DoCommandFlags flags, CargoType cargo_type, Source src, Source dst)
{
	if (!Subsidy::CanAllocateItem()) return CMD_ERROR;

	if (_current_company != OWNER_DEITY) return CMD_ERROR;

	if (cargo_type >= NUM_CARGO || !::CargoSpec::Get(cargo_type)->IsValid()) return CMD_ERROR;

	switch (src.type) {
		case SourceType::Town:
			if (!Town::IsValidID(src.ToTownID())) return CMD_ERROR;
			break;
		case SourceType::Industry:
			if (!Industry::IsValidID(src.ToIndustryID())) return CMD_ERROR;
			break;
		default:
			return CMD_ERROR;
	}
	switch (dst.type) {
		case SourceType::Town:
			if (!Town::IsValidID(dst.ToTownID())) return CMD_ERROR;
			break;
		case SourceType::Industry:
			if (!Industry::IsValidID(dst.ToIndustryID())) return CMD_ERROR;
			break;
		default:
			return CMD_ERROR;
	}

	if (flags.Test(DoCommandFlag::Execute)) {
		CreateSubsidy(cargo_type, src, dst);
	}

	return CommandCost();
}

/**
 * Tries to create a passenger subsidy between two towns.