Why D is not popular enough?

[Guillaume Piolat via Digitalmars-d]

On Friday, 12 August 2016 at 14:41:14 UTC, Shachar Shemesh wrote:
>
> That table was not expensive to compute, and its constantness 
> wasn't crucial enough even for me to put a wrapper pointer and 
> only access it through it. Had that not been the case, and had 
> that table been more expensive to computer, I'd probably 
> compute at compile time with an external tool.
>
> Shachar

And you are forgetting about composability. If I can compute a 
table at compile-time this means I can go higher on the 
abstraction ladder.


void interpFast(string expr)(float x)
{
     // here a look-up computed at compile-time
     static immutable table = makeTable!exp(0, 100, 0.1f);
     int ipart = cast(int)x;
     int fpart = x - ipart;
     return linInterp(table[ipart], table[ipart+1], fpart);
}

void main()
{
    // automatically tabulated
    float x = interpFast!"pow(cos(x) + 4, x)"(0.5f);
}


Not only is this impossible in C++, but being cumbersome it means 
that people won't do it and loose optimization opportunities.