There were quite some nice group eventhandlers introduced in A3 patch 2.10.
What is missing is a group eventhandler which fires when all units of a group were killed. So one doesn't constantly have to check if there is still a unit alive in a group to respawn the group for example.
Something like
group addEventhandler ["allUnitsKilled", {do some stuff}]
I'd suggest "UnitKilled" event handler instead. There you can check if everyone is dead as well doing something on individual unit death.
Samatra, there is already a killed EH.
This is about an event handler only firing when all units in a group are dead.. Needed for AI groups in Co-op missions for example.
Currently you have to constantly iterate over all units of a group to check if all units are down.
So virtually like the empty group EH which only fires when all units in a group are deleted.
I meant group's "Killed" event handler, which is added to the group and fires each time group unit dies. Unless you mean there is already one in https://community.bistudio.com/wiki/Arma_3:_Event_Handlers#Group_Event_Handlers
Example:
_group addEventHandler ["UnitKilled", {
params ["_group", "_unit"];
if(units _group findIf {alive _x} < 0) then {
// Everyone is dead
};
}];