Looking for guidance on one spell

[LearningCode]

Okay, I'm trying to make a spell, but there are parts that I don't really know how to accomplish.

Part 1 of spell:
1) Hero casts spell (Some spirit ball spell)
2) Spell creates dummy (shrunken down wisp)
3) Dummy has a random aura (Anything from Speed to damage to healing aura)
4) Dummy does not do anything, just follows caster indefinitely (AKA forever)

Part 2 of spell Part. A:
1) Hero casts a different spell (Some attacking spell)
2) Trigger checks if Hero has 3 dummies
3) Oldest 3 dummies are removed from game
4) Trigger activates some awesome spell

Part 2 of spell Part. B:
1) Hero casts another spell (Some healing spell)
2) Trigger checks if Hero has 1 dummy
3) Oldest dummy is removed from the game
4) Heal activates

The bold parts are the parts I have no idea on how to do =/

 

[kingkingyyk3]

Use unit indexing system, attaching the struct to hero. :thup:

 

[LearningCode]

Umm..
Err..
Wha- ?

Wait-
I've never done it before xD
I do it using SetUnitUserData, right?

Do I use [lJASS]struct[/lJASS] or [lJASS]private struct[/lJASS]?
How would the triggers of the other 2 spells use the struct in the "Some Spirit ball spell"

 

[kingkingyyk3]

Hmm, make it a library, you can use non-prefix/public.

 

[LearningCode]

Okay, already done the "heavy" parts, I think..
If I want to access the struct attached to the unit..

I just use[lJASS] local <structname> <something> = GetUnitUserData(<unit>)[/lJASS], right? o.0

Then, after I do that, I can call any method within the struct?
Once I am done with the spell..

How do I, like, keep the variables?
Erm..
If the method called changes the value of an integer "SpiritNumber" to 3
Will the value of SpiritNumber be automatically saved?

Like, I don't have to use [lJASS]call SetUnitUserData(blah, blah)[/lJASS] again, right?

 

[kingkingyyk3]

Will the value of SpiritNumber be automatically saved?
Remember this in mind. Struct is actually integer. Members in it are globals with array.
When you allocate a struct index, that means you get an free unused index. When you set it's members' value, it basically is setting globals variables..

struct Data
    integer int
endstruct

    //Set value :
    set <vars>.int = 5

When converted into Jass :

globals
    integer Data_int
endglobals

function Data__allocate takes nothing returns integer
    //return new index/recycled index.
endfunction

function Data__deallocate takes integer this returns nothing
   //recycle the index
endfunction
  
   //Set value :
   set Data_int[<vars>] = 5

 

[LearningCode]

So I don't have to use SetUnitUserData again xD