Associative array for array of classes

[clayasaurus]

Ok, for basic types I know I can use

int[char[]] assoc;
assoc["3"] = 3;

And for classes I can do.

Class[char[]] assoc;
assoc["3"] = new Class;

Now, lets say I want to test if assoc["3"] has already been initialized 
before I allocate it, but testing it with

if (assoc["3"] is null)
   assoc["3"] = new Class;

I get a seg fault. Any other way to do this? File attached to better 
illustrate my problem. Thanks.

~ Clay
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