Struct/vJass Tutorials - Help wanted please

[The_Kingpin]

When you create a new instance of the struct with the .create method.

 

[Doom-Angel]

so you have to call static right from your struct and if using other variable it won't work?

 

[The_Kingpin]

Yes, you must treat it like a global. <StructName>.<Staticvarname>

 

[chovynz]

When you create a new instance of the struct with the .create method.

Why would you make another instance of exactly the same thing? And how can you change that instance if need be?

 

[The_Kingpin]

Why would you make another instance of exactly the same thing? And how can you change that instance if need be?

Hmm, you don't seem to be understanding what structs are for.

When you declare a struct

struct A
integer a = 1
integer b = 2
integer c = 3
endstruct

It's like a template.

When you create an instance of it,

A.create()

This here being based off of A,
it's like creating 3 different variables: a, b, and c.

local A s = A.create() //{local integer s.a, local integer s.b, local integer s.c}

Except the struct can be treated as a single variable, and can be stored or attached to a unit as a single integer.

I.E. instead of attaching three different integers, i can store just one and it gives me all three.

Here's an example of usage:

struct Spell
	unit Caster
	unit Target
	
	method Damage takes nothing returns nothing
		call UnitDamageTarget(this.Caster,this.Target,...)
	endmethod
endstruct

function Trig_Spell_Timeout takes unit u returns nothing
	local Spell s = GetHandleInt(u,"something") //Get the struct from the unit and do actions.
	call s.Damage()
	call s.destroy()
endfunction

function Trig_Spell_Actions takes nothing returns nothing
	local Spell s = Spell.create() //Creates a new structure of data from Spell.
	set s.Caster = GetSpellAbilityUnit()
	set s.Target = GetSpellTargetUnit()
	call SetHandleInt(GetSpellTargetUnit(),"something",s) //Attach the struct to the target.
endfunction

Later, If I were to call Trig_Spell_Timeout passing the targeted unit as the variable, It would retrieve the stored struct from that unit and perform actions with it.

Remember, think of a struct like a package with variables and functions in it. I've created a package with two unit variables and a function inside it, attached that package to the target unit, then later retrieved that package and called the function.

 

[Doom-Angel]

just a question what does making it static will give me that i don't have in a none static value?

 

[chovynz]

So a struct is a template of "integer" or "real", "point" and all those others?
it's the handle of the variable and the value?

 

[The_Kingpin]

Here we go again

It's a single variable that has multiple other variables in it, which are defined in the struct...endstruct block.

 

[chovynz]

"but it's good for you sensei! It will help you with patience!"

Ok I believe you.

 

[The_Kingpin]

So you get it sorta, now?

 

[chovynz]

Sorta, but not. I semiunderstand how to use it, but not what it is.
I will use now and understand later. Thanks for that indepth.....explanation.

DoomAngel still has a Q.

just a question what does making it static will give me that i don't have in a none static value?

 

[The_Kingpin]

I apologize for the lack of explanation. If I was a teacher I would be doing that now, not posting on a forum. Play around with them a little, look at how other people have used them. That's how I learn stuff.

Doomangel ->

Static variables are basically just globals, however they are only accessed via <Structname>.<variable>.

 

[chovynz]

What are these in your example? I can't find them in TESH.

GetHandleInt()
SetHandleInt()

 

[0zaru]

They are some old handle vars that kattana created. anyway you can use some better things like SetCSData and GetCSData (Also HSAS or ABC)

 

[Rheias]

CS_Cache (or Kattana's?) functions, they simply trasfer local data from function to function.

You can think of structs as arrays Chovynz. Instead of variablename[#] to access information you do structname.membername. More than that, instead of holding the exact same type of values, structs vary the types of their values, and can have methods in them, etc.

Edit: I'm suprised this haven't been locked yet. Usually moderators prefer to have seperate thread for each question, rather than a confusing thread like this. I think it would be better if we leave this thread and move to threads that as specific questions.

 

[chovynz]

It probably hasn't been locked as it all relates to basic vJass / struct questions. Maybe.