Array Size

[Ayrayen]

So I was wondering before I got into triggering again.

I heard that array size 1 is from 0 - 10
Is this true?

If that's the case, what about the other array sizes?
Array size 2 = 20 then?

Thanks in advance

 

[LordDz]

No?..

You declare your array like Tempunit[20];

Then you have 20 + 1 unit variables named Tempunit

Like:
Tempunit[0] = Grunt;
Tempunit[1] = Bob;
Tempunit[2] = LordDz;
Tempunit[3] = AwesomeSauceDude;
Tempunit[4] = Grunt the Extreme Destroyer;
Tempunit[5] = Grunt;
etc

 

[edo494]

I think he means GUI, and no, if you say array size is 1, it is really 1, but never set it to anything but 0, because it is fully useless.

What it does in the background is it tries to initialize every index from 0 to (the number - 1), so if I have Trigger array variable which says "Initial size: 10" it will create 10 triggers at indexes 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

However this is not really good, because if you make few arrays that need to be constructed of size 8191(maximum), your map will fail to run initialization triggers properly, because you will hit "OP limit"(thats how we call it) before finishing initializing the variables.

Arrays in Jass are always of size 8191(indexes from 0 to 8190) and can not be made bigger or smaller. vJass does the same thing, but forces you to not use higher indexes(not true inside structs, which basically cuts the array into 8190/array_size pieces)

 

[Ayrayen]

So it is recommended to use as low array size as possible then?

 

[edo494]

yes, because most of the GUI actions create the objects anyway, and then assign it into your variable, so you dont need to pre-initialize 8000 groups, when you actually create group almost every time you do anything with groups in GUI

 

[Ayrayen]

Well then, my questions have been answered.
+rep for ya mate!

Appreciate it.

Have a nice day!

 

[IcemanBo]

Remember that you don't have to change the initial array size for all types.

But you have to do for types that have to be created: UnitGroups, PlayerGroups, Timers, Dialogs. (have I forgot something?)

 

[edo494]

you dont need to create size for unit groups or player groups

 

[IcemanBo]

If you don't create them by your own with index > 1, you might have to.

Not in all cases the GUI covers creation. You simply can add players/units to a not initialized group without any result.

Edit: But if you do something like "Set force[3] = All Players" it's counted as creation.

 

[edo494]

every GUI action related to unit groups, as well as player groups does create group/force automatically.

Yes you need to create them, but I mean you dont need to initialize them at init, hence size can stay 0/1

 

[IcemanBo]

You still can do this:

You simply can add players/units to a not initialized group without any result.

Later, when you want refer to the group, it won't work.

Example:
Add Player1 to Force[3]

Later:
Pick a Random Player of Force[3] ...

 

[edo494]

well yea, but I mean (All enemies of Player 1 - Red) as well as things like (Units within range of X from (Center of region A)) both create force and group respectivelly

 

[Dr Super Good]

JASS has no idea of "array size". Each variable you declare as an array has indices from 0 to 8191. In GUI the size field purely defines what indexes get an initial value.

It should be noted that the implementation of the arrays are dynamic growing arrays with the growth rate being in powers of 2. This means that using index 8191 will resize the array to full size (32 kb) where as using only the first 16 indices will use much less memory (<1 kb).

It should also be noted that due a bug with the save/load code, the contents of index 8191 are lost after a game is loaded.

 

[edo494]

I will add to the "lost when 8191 is loaded" your map will actually crash with critical error if your map has something stored in index 8191 in any array

 

[deathismyfriend]

every GUI action related to unit groups, as well as player groups does create group/force automatically.

Yes you need to create them, but I mean you dont need to initialize them at init, hence size can stay 0/1

This is not entirely true. When using add unit to unit group it does not create that unit group first. So the unit group and player group may be null.

 

[edo494]

https://www.hiveworkshop.com/threads/array-size.259475/post-2615124

 

[deathismyfriend]

https://www.hiveworkshop.com/threads/array-size.259475/post-2615124

If that was meant for me I already know this. My above post was only about the initialization and usage of unit group and player group with the use of add unit / player to group action as that action does not initialize a unit group / player group.

 

[Maker]

What it does in the background is it tries to initialize every index from 0 to (the number - 1), so if I have Trigger array variable which says "Initial size: 10" it will create 10 triggers at indexes 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

GUI array variables are initialized upto the value. Meaning if initial size if 2, then indexes 0, 1, and 2 are initialized with the initial value.

It also creates groups for example upto the initial size. With the default size of 1, groups for indexes 0 and 1 are created automatically.

 

[edo494]

well 1 index up or down but thanks for clarification, I dont work with GUI, so I just assumed size = number of elements, not last initialized element