So... structs?

08-04-2007, 04:00 PM	#1
MrApples	What are these things called structs. Are they like the new game cache or something? I've never had the need for handles/game cache/etc so I don't know what they're about either.

08-04-2007, 04:36 PM	#2
Alexander244	Structs are parrallel arrays... Download JassNewGenPack and read the file "jassnewgenpack3d -> jasshelper -> jasshelpermanual" for more information on structs and all the other new features given by JassNewGenPack

08-04-2007, 05:55 PM	#3
MaD[Lion]	struct is not the new game cache...

08-04-2007, 06:17 PM	#4
Ammorth	Structs just make storage methods safer and quicker.

08-04-2007, 06:18 PM

moyack

Quote:

Originally Posted by MaD[Lion]

struct is not the new game cache...

definitely.

My simple definition of structs is like supervariables which you can define and configure as you need, to see an example of what can you do check is this code:

JASS:

struct Vector
    real x
    real y
    real z
endstruct


function showvector takes vector v returns string
    return "[" + R2S(v.x) + "; " + R2S(v.y) + "; " + R2S(v.z) + "]"
endfunction

function SumVector takes Vector v1, Vector v2 returns Vector
    local Vector v = Vector,create()
    set v.x = v1.x + v2.x
    set v.y = v1.y + v2.y
    set v.z = v1.z + v2.z
    return v
endfunction

function playwithvectors takes nothing returns nothing
    local Vector v = Vector.create() // allocates the variables
    local Vector v2 = SumVector(v, v)
    call DisplayTimedTextFromPlayer(Player(0), 0,0,5, showvector(v) )
    call DisplayTimedTextFromPlayer(Player(0), 0,0,5, showvector(v2) )
    call v.destroy() // free / clean the variables.
    call v2.destroy()
endfunction

And you can add functions to the structs, which are called methods.

JASS:

struct Vector
    real x
    real y
    real z
    
    method showvector takes nothing returns string
        return "[" + R2S(.x) + "; " + R2S(.y) + "; " + R2S(.z) + "]" // check how we can make reference to the data in the struct
    endmethod
endstruct

function SumVector takes Vector v1, Vector v2 returns Vector
    local Vector v = Vector,create()
    set v.x = v1.x + v2.x
    set v.y = v1.y + v2.y
    set v.z = v1.z + v2.z
    return v
endfunction

function playwithvectors takes nothing returns nothing
    local Vector v = Vector.create() // allocates the variables
    local Vector v2 = Vector.create()
    set v.x = 10
    set v.y = 20
    set v.z = -5
    set v2 = SumVector(v, v)
    call DisplayTimedTextFromPlayer(Player(0), 0,0,5, v.showvector() ) // check how we call the method LOL!!
    call DisplayTimedTextFromPlayer(Player(0), 0,0,5, v2.showvector() )
    call v.destroy() // free / clean the variables.
    call v2.destroy()
endfunction

In order to learn more, check Jass New Gen documentation.