On Sunday, August 19, 2012 23:38:01 Caligo wrote:
> template T(){
> enum a = pow(3.0, 2);
> enum b = pow(3, 2.0);
> }
>
> unittest
> {
> alias T!() t;
> }
>
> compiling that I get:
>
> /home/b/phobos/std/math.d(2369): Error: Cannot convert &real to ushort* at
> compile time
> /home/b/phobos/std/math.d(3292): called from here: isNaN(y)
> /home/b/phobos/std/math.d(3403): called from here:
> impl(x,cast(real)y)
> /home/b/phobos/std/math.d(3239): called from here: pow(cast(real)x,y)
> t.d(478): called from here: pow(3,2)
> t.d(485): Error: template instance units.T!() error instantiating
>
> I guess this a bug? any workarounds?
Not all functions work at compile time. It's a valid enhancement request, but
unless a function's documentation says that it works in CTFE, there's no
guarantee that it does. However, we _do_ need to do a better job of marking
functions for CTFE in their documentation and testing for it to make sure that
they stay CTFEable. I have no clue what pow's state is, but it does look like
it's not currently designed to work in CTFE.
- Jonathan M Davis
