Why if(__ctfe)?

[Rene Zwanenburg via Digitalmars-d-learn]

On Tuesday, 16 September 2014 at 13:17:28 UTC, Adam D. Ruppe 
wrote:
> On Tuesday, 16 September 2014 at 13:11:50 UTC, Ilya Yaroshenko 
> wrote:
>> Why not "static if(__ctfe)" ?
>
> ctfe is a runtime condition. The function has the same code 
> when run at compile time, it is just being run in a different 
> environment.

Note that if(__ctfe) does not incur a runtime performance 
penalty. Even in debug builds will the branch be removed.