[Solved] Question about extending structs

[Erkki2]

I'd like to extend Nestharus' Dummy struct so that in the constructor I add a special effect on the unit. Here's what I've tried:

struct

struct Element extends array
    
        thistype nextUnit
        thistype prevUnit
        private effect art
        private delegate Dummy Dummy
        
        static method create takes real x, real y, real facing returns thistype
            local thistype this = Dummy.create(x, y, facing)
            set this.art = AddSpecialEffectTarget(EFFECT, this.unit, "origin")
            set Dummy = this
            return this    
        endmethod
        
        method destroy takes nothing returns nothing
            call DestroyEffect(this.art)
            call Dummy.destroy()
        endmethod
    
    endstruct

The special effect isn't visible, so I believe that I'm not referencing the unit correctly. What is the correct syntax?

 

[chobibo]

Post the script where you used that.

 

[Nestharus]

struct Element extends array
        private effect art
        
        //call this.Dummy to access Dummy, only use static delegates, arrays are silly
        method operator Dummy takes nothing returns Dummy
            return this
        endmethod
        
        static method create takes real x, real y, real facing returns thistype
            local thistype this = Dummy.create(x, y, facing)
            //you were using this.unit, relying on the delegate, but you set the delegate
            //afterwards, so the delegate was 0, so it was 0.unit, which was null
            set art = AddSpecialEffectTarget(EFFECT, Dummy.unit, "origin")
            /*
            set this.art = AddSpecialEffectTarget(EFFECT, this.unit, "origin") //used delegate here, but didn't set yet
            set Dummy = this //see how it's set after you were already using it above?
            */
            return this    
        endmethod
        
        method destroy takes nothing returns nothing
            call DestroyEffect(art)
            call Dummy.destroy()
        endmethod
    
    endstruct

 

[Erkki2]

Now I see why it didn't work. Also, I didn't know that it can be done using operator instead. Thanks for your help!