How to test if float is NaN?

[Walter Bright]

Jarrett Billingsley wrote:
> "Walter Bright" <newshound at digitalmars.com> wrote in message 
> news:e587a9$1k6q$1 at digitaldaemon.com...
> 
>> 'real's are supposed to be the longest floating point type available on 
>> the hardware, so they'd be reals.
> 
> What about hardware that has both 80-bit _and_ 128-bit floats?  ;) 

We'll add another basic type to D. But I don't know of any such 
hardware, or plans for any.