[OT] Clang seems to implement modules

[Walter Bright]

On 11/20/2012 2:45 PM, Jonathan M Davis wrote:
> http://www.drdobbs.com/cpp/c-compilation-speed/228701711

One thing I neglected to mention is that template instantiation is terribly, 
fundamentally, slow. This problem comes to the fore when templates are used to 
implement computations, such as doing a compile time factorial using a template.

No amount of module design can possibly fix that.

D fixes it by using CTFE for compile time computations. (You can still do it 
with templates, but you'll be sorry.) CTFE is still slow, but it's a hundred 
times (made up number) faster than using templates.