Function validateObjectSelection

src/OpenLoco/src/Objects/ObjectIndex.cpp:1240–1283

0x00474167

    // 0x00474167
    std::optional<ObjectType> validateObjectSelection(std::span<SelectedObjectsFlags> objectFlags)
    {
        const auto atLeastOneSelected = [](const ObjectIndexEntry&) { return true; };
        // Validate all the simple object types that
        // require at least one item selected of the type
        for (auto& [objectType, errorMessage] : kValidateTypeAndErrorMessage)
        {
            if (!validateObjectTypeSelection(objectFlags, objectType, atLeastOneSelected))
            {
                GameCommands::setErrorText(errorMessage);
                return objectType;
            }
        }

        // Validate the more complex road object type that
        // has more complex logic
        if (!validateObjectTypeSelection(
                objectFlags, ObjectType::road, [](const ObjectIndexEntry& entry) {
                    const auto tempObj = loadTemporaryObject(entry._header);
                    if (!tempObj.has_value())
                    {
                        return false;
                    }
                    auto* roadObj = reinterpret_cast<RoadObject*>(getTemporaryObject());
                    if (!roadObj->hasFlags(RoadObjectFlags::anyRoadTypeCompatible))
                    {
                        freeTemporaryObject();
                        return false;
                    }
                    if (roadObj->hasFlags(RoadObjectFlags::isOneWay))
                    {
                        freeTemporaryObject();
                        return false;
                    }
                    freeTemporaryObject();
                    return true;
                }))
        {
            GameCommands::setErrorText(StringIds::at_least_one_generic_dual_direction_road_type_must_be_selected);
            return ObjectType::road;
        }

        return std::nullopt;
    }
}