[JASS] Global and local variable with the same name.

[Geshishouhu]

Hi, guys. Please see the example below:

globals
    //Declares a global group variable "gg"
    gg = CreateGroup()
endglobals

function test takes nothing returns nothing
    //Declares a local group varialbe also named "gg"
    local gg = CreateGroup()
    //Which "gg" the following function is calling? The global variable or the local variable?
    call GroupEnumUnitsInRange(gg,x,y,100.,null)
    ......
endfunction

 

[chobibo]

IIRC, wouldn't that cause (a) compile error(s)? Can't test it though, sorry.

 

[Ceday]

It doesn't matter which gg is called, you shouldn't even do something like that anyways.

It depends on how jasshelper compiles code.

 

[Arhowk]

globals
    //Declares a global group variable "gg"
    group gg = CreateGroup()
endglobals

function test takes nothing returns nothing
    //Declares a local group varialbe also named "gg"
    local group gg = CreateGroup()
    //Which "gg" the following function is calling? The global variable or the local variable?
    call GroupEnumUnitsInRange(gg,x,y,100.,null)
    ......
endfunction

the local gg will be called. (not 100% sure about merging with structs and whatnot, but thats how vanilla jass works)

also, this is not proper code to write. under no cases should a global have the same naming syntax as a local variable.

 

[GhostWolf]

It's called name shadowing, is supported by Jass and every other language in existence, and has no practical uses (beside reusing names of course).

The variable closest to the scope referencing it will be used.
In this case the local is in the same scope as the code referencing it, so it will be used.

 

[edo494]

this has use in GUI, because if you name your local variable the same as your global, you will be able to use the local variable with GUI. It works exactly as GW said

 

[Troll-Brain]

Well, it's still a pain to use in GUI, because how the GUI is splitted in several jass functions.
Even a simple if/then, and since a local variable can be used only inside where it has been declared ...
Ofc a GUI user could use it together with a temp global variable, gogo spaghetti code, meh just use jass for that.

 

[Geshishouhu]

Thanks to all of you !