Why isn't this expression const?

[Silverling]

Brian Palmer Wrote:

> This code won't compile:
> 
>  struct Vector3 { float x,y,z; }
>  const Vector3 ROT_FORCE_CCW = {0, 400_000, 0};
>  const Vector3 ROT_FORCE_CW  = {0, ROT_FORCE_CCW.y*-1, 0};
> 
> That last line gives me the error:
> 
>  Error: non-constant expression *((& ROT_FORCE_CCW+4)) * -1.0e+0F
> 
> Strangely, I can do the equivalent three lines with basic types like ints just fine, but I can't get this struct initialization to work. Am I doing something wrong, or is it just lack of compiler smarts? I'm using (gdc 0.23, using dmd 1.007)

Try
const Vector3 ROT_FORCE_CCW = [0, 400_000, 0];
const Vector3 ROT_FORCE_CW  = [0, ROT_FORCE_CCW.y*-1, 0];

That's how you init an array. I assume that Vector3 is an alias for float[3].