[vJASS] Double free protection

[Starquizer]

What is the meaning of double free protection ? I know its that thing in the

function s__STRUCTNAME_destroy takes integer this returns nothing
if bla bla then
bla bla
elseif (si__STRUCTNAME_V[this] != -1) then
Display "Double free of type: STRUCTNAME"
return
endif

Now what is meant by Double free ? and how it may happen ?

 

[PurgeandFire]

Double free is when you deallocate a struct instance more than once. For example:

local MyStruct M = MyStruct.create()
call M.destroy()
call M.destroy() // this will throw the double free error

So you basically need to find out where that happens to prevent that from happening.

 

[Dr Super Good]

Be lucky this is not C where you have no double free memory protection. There you usually get a nice fatal error when you try and free already freed memory.

 

[Berb]

On the contrary. If we were to get C instead of JASS I think we would be lucky. That would be sooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo much better. Seriously.

 

[Dr Super Good]

Well they did in SC2 and frankly it is not much better.

 

[Berb]

That isn't C. That is an imposter.