Is D floating point semantics too advanced?

[Sean Kelly]

Walter Bright wrote:
> Hans-Eric Grönlund wrote:
>> I've written a post on my blog wondering if the floating point
>> semantics is too advanced. The problem I have with it is that I can't
>> write something like this:
>>
>> if (someValue == real.nan) {...}
>>
>> It will never be true, which - for me - is unintuitive.
> 
> The behavior is as specified by the floating point standard IEEE 754. To 
> change it would break from FORTRAN, C and C++ usage in a way that would 
> silently break code that is transliterated.

It would be a horrible inconsistency, but the 'is' operator could be 
made to return true in this instance.  After all, 'is' tests identity, 
not equality.


Sean