If your using a variable to store a group, then when destroying it, it means you will not be abled to access it again because it is destroyed...
GUI group variables do not need to be destroyed if they are going to be used throughout the entire game.
It's not a leak if it is supposed to be there the entire game.
If at some point the group is not going to be used in any trigger anymore, then at that point it's safe to destroy the group.
But only if you are sure that your not doing anything with that group afterwards.
If you are, then you can check if the group variable is empty or not with the following Custom Script line:
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Ofcourse you would have to set the group variable to be empty after you've destroyed it.
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Custom script: set udg_myGroup = null
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After that you can check if the group is empty with the following script:
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Custom script: if udg_myGroup == null then
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Some actions here for whenever the group is empty...
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Custom script: endif
If it's a temporary group then you would need to destroy the group since your not going to reference it again.
Meaning that the temporary group will stay inside the game untill it ends unless being destroyed.
EDIT: Here's an example of how it works.
Whenever a group is created it is being stored inside your RAM memory.
A variable is basically something that points to the location in your RAM memory where this group is stored.
By destroying the group you remove it from your RAM memory.
But the variable now points to an empty location inside your RAM memmory.
Which means that the variable can now not be used anymore since it doesn't point to anything.
Unless the location where it points to is being filled with a new group, which means the variable then points to the new group (This is a bit more advanced though).
A leak basically means that you did not destroy the group inside your RAM memory after using the group, and neither did you set a variable to point to the the newly created group inside your RAM memory.
Meaning the group is now lost somewhere inside the memory because there's nothing that points to that group, nor anything that destroys it inside the memory.
So a leak basically is something that is stored inside your RAM memory without anything that points to where it is being stored. Meaning that it's lost inside your RAM memory and takes up some of your RAM memory usage untill the game ends.
You would need to clean up the leak in order to reduce the RAM memory usage.
If however the purpose of the group is to exist the entire game then it's not a leak.
Since that is what it is supposed to do.
Wave of Flame Death
Events
Conditions
Actions
Set A = (Player number of (Owner of (Dying unit)))
