Function IsEngineBuildable

src/engine.cpp:1246–1279

* Check if an engine is buildable. * @param engine index of the engine to check. * @param type the type the engine should be. * @param company index of the company. * @return True if an engine is valid, of the specified type, and buildable by * the given company. */

 *              the given company.
 */
bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company)
{
	const Engine *e = Engine::GetIfValid(engine);

	/* check if it's an engine that is in the engine array */
	if (e == nullptr) return false;

	/* check if it's an engine of specified type */
	if (e->type != type) return false;

	/* check if it's available ... */
	if (company == OWNER_DEITY) {
		/* ... for any company (preview does not count) */
		if (!e->flags.Test(EngineFlag::Available) || e->company_avail.None()) return false;
	} else {
		/* ... for this company */
		if (!e->company_avail.Test(company)) return false;
	}

	if (!e->IsEnabled()) return false;

	if (type == VEH_TRAIN && company != OWNER_DEITY) {
		/* Check if the rail type is available to this company */
		const Company *c = Company::Get(company);
		if (!GetAllCompatibleRailTypes(e->VehInfo<RailVehicleInfo>().railtypes).Any(c->avail_railtypes)) return false;
	}
	if (type == VEH_ROAD && company != OWNER_DEITY) {
		/* Check if the road type is available to this company */
		const Company *c = Company::Get(company);
		if (!GetRoadTypeInfo(e->VehInfo<RoadVehicleInfo>().roadtype)->powered_roadtypes.Any(c->avail_roadtypes)) return false;
	}

	return true;
}

/**
 * Check if an engine is refittable.