1. Subtypes available to specific company at current date

-> Company::avail_roadtype

 

 

 

2. Subtypes available to any company at current date

FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {

       /* Check if the subtype can be used in the current climate */

       if (!HasBit(e->info.climates,  _settings_game.game_creation.landscape)) continue;

 

       /* Check whether available for all potential companies */

       if (e->company_available != (CompanyMask)-1) continue;

 

       RoadTypeIdentifier rtid = e->GetRoadType();

       if (rtid.basetype != rt) continue;

 

       known_roadsubtypes |= GetRoadTypeInfo(rtid)->introduces_roadtypes;

}

 

/* Get the date introduced roadtypes as well. */

known_roadsubtypes = AddDateIntroducedRoadTypes(rt, known_roadsubtypes, _current_date);

 

 

 

3. Subtypes available to any company at any date

FOR_ALL_ENGINES_OF_TYPE(e, VEH_ROAD) {

       /* Check if the subtype can be used in the current climate */

       if (!HasBit(e->info.climates,  _settings_game.game_creation.landscape)) continue;

 

       RoadTypeIdentifier rtid = e->GetRoadType();

       if (rtid.basetype != rt) continue;

 

       known_roadsubtypes |= GetRoadTypeInfo(rtid)->introduces_roadtypes;

}

 

/* Get the date introduced roadtypes as well. */

known_roadsubtypes = AddDateIntroducedRoadTypes(rt, known_roadsubtypes, MAX_DAY);