[JASS] Stub - Parent - Child - Thistype - Struct Problem

[Anachron]

Hello guys there!

I am having a small problem...

struct Parent
   static thistype array instances[15]

   stub method childOnly ...

   static method call
      call (run the other method of the current struct, NOT parent)
   endmethod

endstruct

struct Child extends Parent

   public method test ...
      call THIS_STRUCT_NAME.instances[0].call()
   endmethod

endstruct

Why does it call the method "childOnly" of the parent, instead of the child's method?

Edit:
What I want:

A parent struct
- This struct has a few stub methods the child will get
- The parent has a static method which will also be given to the child
-> In this method it referes to another static method of thistype (the struct itself)

A child struct
- Which extends the parent
- Which has a few new methods (stub overwrite)
- Which has a few parent methods (like the static one, without needing to rewrite in child)

even more explaination:
basicly I have 4 methods: 1 static and 1 normal in each struct (2 structs). The child struct also has the static, but also an own normal method. The static referes to the current struct normal method. But that doesn't work.

 

[Element of Water]

Well, thistype returns the struct the thistype is in. It doesn't take into account what stage in the inheritance the function was called from. Thistype is meant to be used with modules, nothing else.

 

[Anachron]

But how the fuck can I solve my problem?^^

 

[Element of Water]

I don't really see any way of doing what you want to do, other than by making test take a parameter for which kind of struct it is.

 

[Anachron]

Hmm that would be one solution... But, how is it possible there is nobody that required that? :S

 

[Element of Water]

It would be quite impossible for Vexorian to make. How can he make the methods able to tell which type of struct they were called from?

 

[Anachron]

Wait... You got me wrong.

I just want ONE FU**ING KEYWORD for getting the actual struct, not the parent struct in an extended struct.

Thats all I was looking for. Vex just needs to add 1 keyword for the current struct, which also has the struct child name in the child.

 

[Eleandor]

I still don't get what you're trying to do. I'm sorry :-/

I don't really understand your code either. Why is test 2 a stub method in the parent and a static method in the child? It seems to me that whatever you're trying to achieve, you're trying to do it in the wrong way.

 

[Anachron]

This is what I want to do:

basicly I have 4 methods: 1 static and 1 normal in each struct (2 structs). The child struct also has the static, but also an own normal method. The static referes to the current struct normal method. But that doesn't work.

 

[Eleandor]

But a static method is bound to the struct's type, while a stub method is bound to an instance of the struct...

Is this what you want to do?

struct A
stub method bla ...
static method Bla ...
    local A a = B.create()
    call a.bla() // will display "Bla"
endmethod
endstruct

struct B extends A
    stub method bla ... display "Bla"
endstruct

 

[Anachron]

struct Parent
   static thistype array instances[15]

   stub method childOnly ...

   static method call
      call (run the other method of the current struct, NOT parent)
   endmethod

endstruct

struct Child extends Parent

   public method test ...
      call THIS_STRUCT_NAME.instances[0].call()
   endmethod

endstruct

 

[Eleandor]

That makes no sense.

Parent.call() is a static method. It cannot possibly call a method of the *current struct* because there *is* no current struct.

Maybe post your entire code instead of trying to make up an obscure example because I really don't see what you try to do.

Are you perhaps looking for something like:

local A a = B.create()
if a.getType() == B.typeid then
    call BJDebugMsg("Struct a of static type A is of dynamic type B...")
endif

 

[Anachron]

I edited it, now it makes sense.

I just want to call the static method inside the struct without needing to write the struct name every damn time I create it new.

 

[aznricepuff]

First of all, you cannot override static methods. If you try to do something like this:

struct A
    static method foo takes nothing returns nothing
    endmethod
endstruct

struct B
    static method foo takes nothing returns nothing
    endmethod
endstruct

You'll get a compile error.

Secondly, obviously your thing won't run the child's method because you haven't defined it yet. A simple solution to your problem would be:

struct Parent
   static thistype array instances[15]
   stub method childOnly ...
endstruct
struct Child extends Parent
   method childOnly ...
   public method test ...
      call Parent.instances[0].childOnly()
   endmethod
endstruct

This will call the childOnly() method of the struct type of whatever instance is held by Parent.instances[0]. So if the instance was created using Parent.create(), it will call Parent.childOnly(); if the instance was created using Child.create(), it will call Child.childOnly().

 

[Anachron]

I don't want to overwrite statics, I just want the childs to have them, too!
(So I don't need to have to type the same thing for them)

So the thing is: Childs will NOT have static vars?

And WHY isn't there a keyword for the current struct?

I mean, even the compiler needs to save the name of the current struct being opened. It would be SUCH an awesome method.

Oh btw, I want an thing that says inheritable.
( public inheritable static blah.. )

 

[Element of Water]

I think you can typecast directly from parent to child too, AKA

struct Parent
    stub method test takes nothing returns nothing
        call BJDebugMsg("Parent")
    endmethod
endstruct
struct Child extends Parent
    method test takes nothing returns nothing
        call BJDebugMsg("Child")
    endmethod
endstruct

local Parent p = Parent.create()
call Child(p).test() //outputs "Child"

 

[Anachron]

Thats not what I was asking, lol.

I want an inheritable static method, meh.

 

[Eleandor]

How can a static method be inherited? A static method is supposed to be called without providing any instance data.

Parent.func() is a static method and it does not take any object, it's just part of "being a Parent".
Child.func() cannot exist because it is already defined by Parent. As soon as you start slicing, there's no way you can figure out which static method you wish to call.

If you need static methods to be virtual, you're doing something wrong design-wise.

 

[aznricepuff]

local Parent p = Parent.create()
call Child(p).test() //outputs "Child"

That doesn't work, and you shouldn't ever do that.

And WHY isn't there a keyword for the current struct

thistype

 

[Element of Water]

That doesn't work, and you shouldn't ever do that.

I'm pretty sure it does work, but yeah, you're doing something wrong if you have to do it.

And thistype isn't what he means. He means when you're calling a parent method through a child struct.

 

[aznricepuff]

super

 

[Element of Water]

No, not like that. I mean:

struct A
    method doA //blah
endstruct
struct B extends A
endstruct

local B b = B.create()
call b.doA() //call the parent's method through an instance of the child

 

[aznricepuff]

So what's the problem? That works just fine.

 

[Element of Water]

Urgh. His problem is this...

struct A
    method doA takes nothing returns nothing
        //Need to work out which type of struct this was called from
    endmethod
endstruct
struct B extends A
endstruct
struct C extends A
endstruct

local B b = B.create()
local C c = C.create()

call b.doA() //How can the method tell that the instance that called the method was a B, a C, or an A?
call c.doA()

 

[Eleandor]

doA should not ever know specific things about its children. The method should not be able to tell which child type is calling it, because a parent does not know anything about its children. Only children know something about their parents. Anything else is a sign of bad design. When you need to do something like that, you should use stub methods.

struct A
    stub method doA takes nothing returns nothing
        call BJDebugMsg("A")
    endmethod
endstruct

struct B extends A
    stub method doA takes nothing returns nothing
        call BJDebugMsg("B")
    endmethod
endstruct

 

[Anachron]

Guys, you don´t get it!

what I basicly mean is that I need to refer to a static function inside a non-static method in a struct which extended / is a children of another struct, which basicly contains these static methods.

I need the same methods, but added to the children, because I can NOT use the parents method.

And what does SUPER do?


Edit: So I was asking to the "CURRENT_STRUCT_NAME" thing, because thistype is THE parent type on child creation, not the child name.

 

[Element of Water]

Not possible...

EDIT: And super allows you to call parent methods that the child has overridden through the child.