[JASS] Arrays

[Storyyeller]

Do arrays take up space for the full 4096 elements, even if you don't use them?

For example, suppose you had an array, but you only used the first 6 values. Would it still take up 16kb worth of space?

If so, is it better to combine arrays to use less space? For example, instead of using 7 arrays with 6 elements each, use one array with 42 elements?

 

[Cokemonkey11]

I believe if you specify the max size of the array like

local unit arry u[5]

it will only take up the index worth of space, but it's hard to say.

 

[Eleandor]

8191 elements to be precise.

And it's pretty unclear to me if it allocates memory for all elements from the start. Some say it drectly uses 8191 elements (32kb), others say that it's allocated in chunks of 256 (2kb)...

32kb isn't a big deal anyway. Nothing compared to what 1 leak does in a periodic trigger.

 

[The Reborn Devil]

I'm very sure it only allocates memory when it's required.
I.e. if I have an array and I use 5 slots, it will only allocate memory for those 5 slots.

 

[Eleandor]

My tests seem to suggest that it's allocated in chunks of 2kb indeed... As opposed to only the used slots.

 

[Feroc1ty]

It actually allocates the closest 2 to power of n. ex: 1,2,4,8,16,32,64,128...

And there are 8192 slots, you also have to count the 0.