Setting the size of an array inside a class object, not working

Questions & Answers
1

I keep getting a “Object reference not set to an instance of an object” error every time I try to define the size of an array, which is located in an array of class objects. Here is an simplified, detached example of what I am trying to accomplish:

var matrixItem : mClass[];

class mClass{
    obj : Vector2[];
}

function Awake(){
    matrixItem = new mClass[10];
    for(i = 0; i < matrixItem.length; i++){
        matrixItem*.obj = new Vector2[64];*

}
}
Can anyone help me determine what I am doing wrong? Thank you for any advice!

2

Hello,

Your problem is not the creation of the built-in array. It would have been a more simple thing to solve had you posted the actual error (including line number) rather than only quote it.

When you create a new built-in array of non-struct objects, then each element is always going to be null. So when you create a new mClass[2] you will get something line [null, null]. A null value does not have a obj field and therefore throws an error.

When using built-in arrays, you need to initialize the elements so that they are not null:

for (i = 0; i < array.length; i++) {
     array *= new mClass();*

array*.obj = new Vector2[64];*
}
For a Vector2 array however, you do not need to do this because Vector2 is a structure not a class.
Hope this helps,
Benproductions1