Function ResearchUpdateFirstOfType

src/openrct2/management/Research.cpp:1030–1055

static BitSet<RIDE_TYPE_COUNT> _seenRideType = {};

static void ResearchUpdateFirstOfType(ResearchItem* researchItem)
{
    if (researchItem->isNull())
        return;

    if (researchItem->type != Research::EntryType::ride)
        return;

    auto rideType = researchItem->baseRideType;
    if (rideType >= RIDE_TYPE_COUNT)
    {
        LOG_ERROR("Research item has non-existent ride type index %d", rideType);
        return;
    }

    researchItem->flags &= ~RESEARCH_ENTRY_FLAG_FIRST_OF_TYPE;
    const auto& rtd = GetRideTypeDescriptor(rideType);
    if (rtd.flags.has(RtdFlag::listVehiclesSeparately))
    {
        researchItem->flags |= RESEARCH_ENTRY_FLAG_FIRST_OF_TYPE;
        return;
    }

    if (!_seenRideType[rideType])
        researchItem->flags |= RESEARCH_ENTRY_FLAG_FIRST_OF_TYPE;
}

static void ResearchMarkRideTypeAsSeen(const ResearchItem& researchItem)
{