Constant relationships between non-constant objects

[Daniel Murphy via Digitalmars-d]

"Sebastian Unger"  wrote in message 
news:ebzakjopnllweizsikai at forum.dlang.org...

> I have two classes A and B. Each object of class A is associated
> with a particular object of class B. This association is not
> supposed to change throughout the lifetime of the object of A.

I think D used to have this in the form of the 'final' storage class for 
variables.  I'm not sure why we got rid of it.