just an idea (!! operator)

[David Piepgrass]

>> Yeah, I've been planning to try and get this into D one day.  
>> Probably
>> something like:
>> (a ?: b) ->  (auto __tmp = a, __tmp ? __tmp : b)
>
> gcc used to have that extension and they dropped it...

But GCC can't control the C++ language spec. Naturally there is a 
reluctance to add nonstandard features. It's a successful feature 
in C#, however, and a lot of people (including me) have also been 
pestering the C# crew for "null dot" (for safely calling methods 
on object references that might be null.)

I don't see why you would use ?: instead of ??, though.