From: Warren Young
Date: December 3 2008 9:46pm
Subject: Re: Problem with Null string type
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Brad Hubbard wrote:
> But I thought this;
> 
>        operator Type&()
>        {
>                if (is_null)
>                        return data = Behavior::null_is();
>                else
>                        return data;
>        }
> in null.h must be how you "safely" get the data member. 

Yes, you're right, that works.  I was confused.  The compiler is 
complaining about operator=(), not operator Type&().

Which one is line 74 in your excerpt?   Can you cut it down some, 
ideally to just one line that shows the problem?