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[Trigger] Null var

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Level 10
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Nov 19, 2011
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516
Hi there,

Here are two questions that I am tring to find answer:

1. How to set variable to null? Is destroy doing so for all variable types or not?
2. How to check if variable value is null?

I have a set of points on the map, and I am about to store them into table. But if I will not count well and set table length to more than points count? How to check if I am not about to refer to null value? Or maybe I am able to set endless table like in JAVA?
 
1) if its a unit the set it to no unit. Some of the other variables u can do this to. Other variables u need to use custom script. A variable is a pointer to a piece of memory. When u destroy that variable u actually destroy the memory that it points to. To null u need to destroy first then null.

2) use an ITE and In the conditions block check if unit equal to no unit. And same with the others.
 
Level 10
Joined
Nov 19, 2011
Messages
516
In JAVA it looks like this:

int table[]

that is endless table where table.length stores it largerst index.

So.. all of variables in WC3 are pointers? That sloves a lot. So until I set some value it not uses space in memory...

What about objects then? Can I make a record variable:

record el
{
point position;
int value;
}

??
 
Sort of. You can emulate that class structure with structs in vJASS:
JASS:
struct X
    real x
    real y
endstruct

Then you can make an instance and set the variables:
JASS:
local X example = X.create()
set example.x = 5
set example.y = 10

Of course, there are a lot more things to it than that. You should look into some of the vJASS tutorials around our tutorials section.
 
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