Improvement to switch-case statement

[bearophile]

Adam D. Ruppe:

> case 2..5:
>   code;
>   break;
> 
> could just be magically converted into
> case 2:
> case 3:
> case 4:
> case 5:
>   code;
>   break;

Note that the following syntax is already possible in D:

case 2,3,4,5:
  code;
  break;

But the range gets larger that syntax gets ugly, so the .. range looks like a good thing to have. So I'm +1 on the idea of the original poster.

The range syntax of the D2 foreach may be even extended to support:

if (x in 10..20) {...

That more or less equals to the C macro:
#define InRange(x, a, b) (unsigned((x) - (a)) <= (b) - (a))

That as you can see has just one branch instead of the usual two:
http://smallcode.weblogs.us/checking_if_point_belongs_to_interval

Bye,
bearophile