Discussion Usefulness of Boxed typed Collections?

So.. while working on Spawn 2.0 I got tired of writing this same sort of code over and over again : D. Ended up making a little scripty thing.

Normally collections are not boxed and their type is themselves. This may seem like a wonderful design, but for some cases it is not so wonderful =P, especially when you want to overwrite values and then undo those writes.

JASS:
//! textmacro MAKE_BOX_STACK takes DATA
    private struct NodeX extends array
        public thistype next
        
        public static method create takes nothing returns thistype
            return $DATA$.create()
        endmethod
        
        public method destroy takes nothing returns nothing
            call $DATA$(this).destroy()
        endmethod
    endstruct
    
    private keyword allocate
    private keyword hasNext
    private keyword push
    private keyword pop
    private keyword deallocate
    private keyword clear
    
    private module Stack
        private static integer instanceCount = 0
        private static thistype array recycle
        private static integer recycleCount = 0
        
        //stack pointer
        private delegate $DATA$ first
        
        public static method allocate takes nothing returns thistype
            local thistype this 
            if (recycleCount != 0) then
                set recycleCount = recycleCount - 1
                set this = recycle[recycleCount]
            else
                set instanceCount = instanceCount + 1
                set this = instanceCount
            endif
            
            set first = NodeX.create()
            set NodeX(first).next = 0
            return this
        endmethod
        
        public method operator hasNext takes nothing returns boolean
            return NodeX(first).next != 0
        endmethod
        
        public method operator empty takes nothing returns boolean
            return NodeX(first).next == 0
        endmethod
        
        public method push takes nothing returns nothing
            local NodeX new = NodeX.create()
            set new.next = first
            set first = new
        endmethod
        
        public method pop takes nothing returns nothing
            if (hasNext) then
                call NodeX(first).destroy()
                set first = NodeX(first).next
            endif
        endmethod
        
        public method deallocate takes nothing returns nothing
            loop
                exitwhen first == 0
                call NodeX(first).destroy()
                set first = NodeX(first).next
            endloop
            
            set recycle[recycleCount] = this
            set recycleCount = recycleCount + 1
        endmethod
        
        public method clear takes nothing returns nothing
            loop
                exitwhen empty
                call NodeX(first).destroy()
                set first = NodeX(first).next
            endloop
        endmethod
    endmodule
//! endtextmacro


The goal of the script is to allow a struct to have values that can revert themselves. For example

JASS:
/////        
    private scope Origin
        private struct Data extends array
            private static integer instanceCount = 0
            private static thistype array recycle
            private static integer recycleCount = 0
            
            public integer testData

            public static method create takes nothing returns thistype
                local thistype this 
                if (recycleCount != 0) then
                    set recycleCount = recycleCount - 1
                    set this = recycle[recycleCount]
                else
                    set instanceCount = instanceCount + 1
                    set this = instanceCount
                endif
                
                return this
            endmethod
            
            public method destroy takes nothing returns nothing
                set recycle[recycleCount] = this
                set recycleCount = recycleCount + 1
            endmethod
        endstruct
        
        //! runtextmacro MAKE_BOX_STACK("Data")
        
        struct Origin extends array
            implement Stack
            public static method create takes nothing returns thistype
                return allocate()
            endmethod
            
            public method overwrite takes nothing returns nothing
                call push()
            endmethod
            
            public method revert takes nothing returns nothing
                call pop()
            endmethod
            
            public method original takes nothing returns nothing
                call clear()
            endmethod
            
            public method operator isSelf takes nothing returns boolean
                return empty
            endmethod
            
            public method destroy takes nothing returns nothing
                call deallocate()
            endmethod
        endstruct
    endscope


and demo code
JASS:
scope TestCode
    private struct Tester extends array
        private static method onInit takes nothing returns nothing
            local Origin origin = Origin.create()
            set origin.testData = 5
            call origin.overwrite()
            set origin.testData = 12
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, I2S(origin.testData))
            call origin.revert()
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, I2S(origin.testData))
            //this commented code will not compile ^_^
            //call origin.push()
        endmethod
    endstruct
endscope


eh?

also you can do some very crazy objects

JASS:
    private scope Origin
        private scope X
            private struct Data extends array
                private static integer instanceCount = 0
                private static thistype array recycle
                private static integer recycleCount = 0
                
                public real x

                public static method create takes nothing returns thistype
                    local thistype this 
                    if (recycleCount != 0) then
                        set recycleCount = recycleCount - 1
                        set this = recycle[recycleCount]
                    else
                        set instanceCount = instanceCount + 1
                        set this = instanceCount
                    endif
                    
                    return this
                endmethod
                
                public method destroy takes nothing returns nothing
                    set recycle[recycleCount] = this
                    set recycleCount = recycleCount + 1
                endmethod
            endstruct
            
            //! runtextmacro MAKE_BOX_STACK("Data")
            
            public struct Origin extends array
                implement Stack
                public static method create takes nothing returns thistype
                    return allocate()
                endmethod
                
                public method overwrite takes nothing returns nothing
                    call push()
                endmethod
                
                public method revert takes nothing returns nothing
                    call pop()
                endmethod
                
                public method original takes nothing returns nothing
                    call clear()
                endmethod
                
                public method operator isSelf takes nothing returns boolean
                    return empty
                endmethod
                
                public method destroy takes nothing returns nothing
                    call deallocate()
                endmethod
            endstruct
        endscope
        private scope Y
            private struct Data extends array
                private static integer instanceCount = 0
                private static thistype array recycle
                private static integer recycleCount = 0
                
                public real y

                public static method create takes nothing returns thistype
                    local thistype this 
                    if (recycleCount != 0) then
                        set recycleCount = recycleCount - 1
                        set this = recycle[recycleCount]
                    else
                        set instanceCount = instanceCount + 1
                        set this = instanceCount
                    endif
                    
                    return this
                endmethod
                
                public method destroy takes nothing returns nothing
                    set recycle[recycleCount] = this
                    set recycleCount = recycleCount + 1
                endmethod
            endstruct
            
            //! runtextmacro MAKE_BOX_STACK("Data")
            
            public struct Origin extends array
                implement Stack
                public static method create takes nothing returns thistype
                    return allocate()
                endmethod
                
                public method overwrite takes nothing returns nothing
                    call push()
                endmethod
                
                public method revert takes nothing returns nothing
                    call pop()
                endmethod
                
                public method original takes nothing returns nothing
                    call clear()
                endmethod
                
                public method operator isSelf takes nothing returns boolean
                    return empty
                endmethod
                
                public method destroy takes nothing returns nothing
                    call deallocate()
                endmethod
            endstruct
        endscope
        
        private struct Data extends array
            private static integer instanceCount = 0
            private static thistype array recycle
            private static integer recycleCount = 0
            
            private delegate X_Origin originx
            private delegate Y_Origin originy

            public static method create takes nothing returns thistype
                local thistype this 
                if (recycleCount != 0) then
                    set recycleCount = recycleCount - 1
                    set this = recycle[recycleCount]
                else
                    set instanceCount = instanceCount + 1
                    set this = instanceCount
                endif
                
                set originx = X_Origin.create()
                set originy = Y_Origin.create()
                
                return this
            endmethod
            
            public method operator xObj takes nothing returns X_Origin
                return originx
            endmethod
            
            public method operator yObj takes nothing returns Y_Origin
                return originy
            endmethod
            
            public method destroy takes nothing returns nothing
                set recycle[recycleCount] = this
                set recycleCount = recycleCount + 1
            endmethod
        endstruct
        
        //! runtextmacro MAKE_BOX_STACK("Data")
        
        struct Origin extends array
            implement Stack
            
            public static method create takes nothing returns thistype
                return allocate()
            endmethod
            
            public method overwrite takes nothing returns nothing
                call push()
            endmethod
            
            public method revert takes nothing returns nothing
                call pop()
            endmethod
            
            public method original takes nothing returns nothing
                call clear()
            endmethod
            
            public method operator isSelf takes nothing returns boolean
                return empty
            endmethod
            
            public method destroy takes nothing returns nothing
                call deallocate()
            endmethod
        endstruct
    endscope


demo
JASS:
scope TestCode
    private struct Tester extends array
        private static method onInit takes nothing returns nothing
            local Origin origin = Origin.create()
            set origin.x = 1
            set origin.y = 1
            call origin.xObj.overwrite()
            call origin.yObj.overwrite()
            set origin.x = 2
            set origin.y = 2
            call origin.overwrite()
            set origin.x = 3
            set origin.y = 3
            
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.x))
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.y))
            call origin.revert()
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.x))
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.y))
            call origin.xObj.revert()
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.x))
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.y))
            call origin.yObj.revert()
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.x))
            call DisplayTextToPlayer(GetLocalPlayer(), 0, 0, R2S(origin.y))
            //this commented code will not compile ^_^
            //call origin.push()
        endmethod
    endstruct
endscope


I would specifically use this for mimicing data ^.^... for example, if you wanted a unit to mimic another unit for like a special Mimic spell that lasted bleh seconds, you could store the unit data, destroy your unit, and then clone the target.

If the target had like mimic health, you could overwrite health and w/e.
 
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