between and among: worth Phobosization?

[Timon Gehr]

On 12/16/2013 09:38 PM, Andrei Alexandrescu wrote:
> bool between(T, U1, U2)(T v, U1 lo, U2 hi)
> {
>      return v >= lo && v <= hi;
> }
> ...

There's the issue of different possibilities for inclusive/exclusive end 
points. Maybe we want to add a template parameter taking values from 
["[)","()","(]","[]"]. Even then it is not too clear what the default 
should be. (Probably "[)".)

> uint among(T, Us...)(T v, Us vals)
> {
>      foreach (i, U; Us)
>      {
>          if (v == vals[i]) return i + 1;
>      }
>      return 0;
> }
> ...

I have my own version of this. I vote add.