Canberra as well. That’s fine because while the physical stand and airbridge can be used for domestic and international passengers, internally passengers are segregated. Domestic passengers are on one level, international departures above and international arrivals below. Once a passenger has gone through international security and border control there is no chance of them intermingling with domestic passengers even if they are in the same building.
I don't want this to sound cruel but it appears that whilst swing gates may work in Australia, it is really only in locations where international operations are more a novelty than a full-blown operation. Whilst it is OK in CBR and ADL with >10 international movements per day, it is hard to see why you'd bother in places such as MEL, SYD, PER and BNE, where int'l ops are basically non-stop and therefore justify their own dedicated area/terminals.
As has been pointed out, AU int'l ops differ significantly from other places such as US where departures are mixed and there are few, if any, int'l departure controls, An Australian mixed terminal would require a duplication of airside functions such as lounges, concessions etc in segregated areas unless you were going to subject domestic departures to the same vetting as international which does have arguments in its favour but would be time-consuming and more expensive.
717, 721/2, 732/3/4/5/7/8/9, 742/3/4, 752/3, 762/3, 772/E/W, 788/9, 300,310, 319,320/1, 332/3, 359, 388, DC9, DC10, F28, F100, 142,143, E90, CR2, D82/3/4, SF3, ATR