Function CheckSubsidyDuplicate

src/subsidy.cpp:143–151

* Check whether a specific subsidy already exists. * @param cargo Cargo type. * @param src The source. * @param dst The destination. * @return \c true if the subsidy already exists, \c false if not. */

 * @return \c true if the subsidy already exists, \c false if not.
 */
static bool CheckSubsidyDuplicate(CargoType cargo, Source src, Source dst)
{
	for (const Subsidy *s : Subsidy::Iterate()) {
		if (s->cargo_type == cargo && s->src == src && s->dst == dst) {
			return true;
		}
	}
	return false;
}

/**
 * Checks if the source and destination of a subsidy are inside the distance limit.