Reuse of variables referencing const objects

[Chris Nicholson-Sauls]

Sergey Kovrov wrote:
> On 3/6/2009 11:29 PM, Steven Schveighoffer wrote:
>> std.typecons.Rebindable
>>
>> http://www.digitalmars.com/d/2.0/phobos/std_typecons.html#Rebindable
> 
> Thanks Steve,
> 
> this is what I've been looking for, the only thing missing is comparing 
> against null (is null).
> 
> 
> -- serg.

While not strictly intuitive, you could do this:
   auto var = Rebindable!(const Foo)(new Foo);
   assert(var.opDot !is null);

As 'opDot' returns the wrapped object (with const intact).  The downside 
to that, however, is that it won't work in those cases where 
Rebindable's template parameter was mutable, as then it simply aliases 
it.  This shouldn't be a problem in general use, though.  Only in 
generic code, which could try to check for Rebindable.

-- Christopher Nicholson-Sauls