between and among: worth Phobosization?

Walter Bright newshound2 at digitalmars.com
Mon Dec 16 13:45:38 PST 2013


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

You'd need 4 such functions, < <, < <=, <= <, <= <=, and it just seems like trivia.

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

This has O(n) behavior, which might be unexpected for the user.



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