some might think that it is a joke to call natives on already removed handles, probably because most of the times it is harmless. But it is a terrible idea. Always make sure the handle exists. There are few natives that I would know that work one of them is GetUnitState which I extensively used to recognize if a unit is removed.
On the other hand, some natives can pretty much screw the map big time. Just call SetUnitX/Y on an already removed unit multiple times and you will screw up CreateTrigger()
Have fun, if your map is Jass enhanced and got a lot of dynamic triggers, paste this code and press escape in game. It is fun to see everything fail.
JASS:
function eH2I takes handle h returns integer
return h
return 0
endfunction
function dI2U takes integer i returns unit
return i
return null
endfunction
function Trig_Untitled_Trigger_001_Actions takes nothing returns nothing
local unit u=CreateUnit(Player(0),'hfoo',0,0,0)
local integer k=eH2I(u)
call RemoveUnit(u)
call TriggerSleepAction(0.)
loop
set u=dI2U(k)
call SetUnitX(u,1)
call TriggerSleepAction(0.0)
set u=null
endloop
call BJDebugMsg("screwed?")
endfunction
function InitTrig_Untitled_Trigger_001 takes nothing returns nothing
set gg_trg_Untitled_Trigger_001 = CreateTrigger( )
call TriggerRegisterPlayerEventEndCinematic( gg_trg_Untitled_Trigger_001, Player(0) )
call TriggerAddAction( gg_trg_Untitled_Trigger_001, function Trig_Untitled_Trigger_001_Actions )
endfunction
