Question about mutable arrays

[Steven Schveighoffer]

On Fri, 20 Nov 2009 09:42:55 -0500, A Bothe <info at alexanderbothe.com>  
wrote:

> These lines were just a basic idea...of course I have to fill the  
> array...
>
> string[] a=new string[2];
>
> a[0]="A";
> a[1]="B";
>
> my idea was to create a list class to store something in it...
>
> class List(T)
> {
> T[] arr;
>
> // ctors and such
>
> void opIndexAssign(T e,int i)
> {
>      arr[i]=e; // And here it throws the exception that arr is not  
> mutable...
> }
> }

First, it looks like you are assuming you can just assign an element of an  
array without ensuring the array is large enough to hold it.  This works  
in some dynamic languages but not D.

Second, if you have done that properly, this should work if T is string,  
because although string is not fully "mutable", it is rebindable.

Can you post a full code example, and the exact error message you get?   
It's hard to guess what problem you are running into.  You don't need to  
post full code, just enough to make the error occur.

-Steve