Static Function Overloading?

01-07-2009, 04:19 AM

I'm aware the general WC3 compiler does not support Function Overloading directly but I'm curious if there's some way to pull it off.

Essentialy what I'm trying to do is overload a function:

Code:

struct
 method TakesAnything takes integer a returns nothing
  call BJDebugMsg(I2S(a))
 endmethod

 method TakesAnything takes real a returns nothing
  call BJDebugMsg(R2S(a))
 endmethod
endstruct

Essentialy what I'm trying. I know I can mock-overload something with interfaces, but it requires use of structs whereas I'm trying to use native types. I'd also like to avoid wrapping the native types as structs (if possible)

A problem of convenince, it's entirely possible (and simpler) to just make several functions and call them by hand, but it loses oh so much elegance.

Thanks ;P.

01-07-2009, 12:17 PM	#2
Zerzax	Use a function interface? It's in JassHelper manual

01-07-2009, 10:42 PM	#3
Blackroot	I'm overloading natives, as far as I know interfacing only works with structs. Additionaly creating a struct wrapper for the natives would defeat the point of overloading them in the first place :/. Therin lies my problem.

01-08-2009, 12:15 AM	#4
Zerzax	Function interfaces don't need structs, they just allow functions to be derived from a main interface as long as they take and return the same paramaters. Does that help?

01-08-2009, 01:46 AM

Blackroot

Yes, but my problem comes in when I'm trying to announce the interface for the type.

Code:

interface Something
   method Does takes nothing returns nothing

   endmethod
endinterface

type unitx extends Something extends unit

For one that wont compile, two I have no idea how I'd even announce the Does function for unitx outside of a struct.

But if interfaces have the ability to work outside of a struct... structure, could you show me an example of that?

01-08-2009, 01:55 AM

Zerzax

JASS:

function interface ValueMessager takes real v returns nothing

function FloatMessage takes real x returns nothing
    call BJDebugMsg(R2S(x))
endfunction

function IntMessage takes real x returns nothing
    call BJDebugMsg(I2S(x))
endfunction

function TestMessager takes ValueMessage v returns nothing
    call v.evaluate()
endfunction

function DeclareMessager takes nothing returns nothing
    local ValueMessager v=ValueMessager.IntMessage
    call TestMessager(v)
endfunction

This is basically copied from the JassHelper Manual.

01-08-2009, 02:53 AM	#7
Vexorian	Basically this shows of what the non-sense the word "overloading" is. For some retarded reason it means 3 different things. What Blackroot was asking for was not function interfaces, as to answer the question, no, not yet. But maybe one day.

01-08-2009, 03:00 AM	#8
Zerzax	At least Blackroot knows function interfaces exist now. I was unsure as to what was being sought out.

01-08-2009, 04:43 AM

Blackroot

Yes I guess I wasn't very clear on my intentions, it is an ambigious thing -,-.

What I really wanted was this:

Code:

function Something takes integer x || real x returns nothing
case integer:
//Do stuff
case real:
//Do stuff
endfunction

There is really nothing special about this, I just wanted to avoid:

Code:

function SomethingInt takes integer x returns nothing

endfunction

function SomethingReal takes integer y returns nothing

endfunction

Interfaces don't help me because I cannot change native types nor can I make wrappers to extend them. The only way to implement it would be:

Code:

interface Something
 method Do takes nothing returns nothing
endinterface

struct IntWrapper extends Something
 integer I
 method Do takes nothing returns nothing
  call BJDebugMsg(I2S(I))
 endmethod
endstruct

struct RealWrapper extends Something
 real I
 method Do takes nothing returns nothing
  call BJDebugMsg(R2S(I))
 endmethod
endstruct

struct MyStruct
 IntWrapper I
 RealWrapper F

 static method create takes nothing returns nothing
  local MyStruct ms = MyStruct.allocate()
  set ms.F = RealWrapper.create()
  set ms.I = IntWrapper.create()
 endmethod

 method DoSomething takes Something f returns nothing
   call Do(f)
 endmethod

 method OrDoItThisWay takes boolean b returns nothing
   if(b == true)then
   call Do(.I)
   else
   call Do(.F)
   endif
 endmethod
endstruct

I doubt that code would actually run, but it's a godawful mess to implement if it does and it's not even as elegant as it should be. One method requires the user to pass a boolean and would mean he would have to pass arguments for both cases if there were any arguments. In the other method it requires the user to create a wrapper, which defeats the point of trying to make it look prittier.

Oh well though, I have no way of comparing types so I guess I'm stranded with announcing clone functions >.<.

Oh well, thank you very much for the help anyways Zerzax and Vex :P.