rank of range

[drug via Digitalmars-d-learn]

01.07.2017 20:33, Ali Çehreli пишет:
> On 07/01/2017 10:05 AM, drug wrote:
>> Hello!
>> Is there a convenient way to get rank of range a.k.a. count of
>> dimensions in compile time? Like:
>>
>> static assert( rankOf!(uint[]) == 1);
>> static assert( rankOf!(uint[][][]) == 3);
> 
> I'm not aware of one but this seems to work:
> 
> template rankOf(R) {
>      import std.range : isInputRange, ElementType;
> 
>      static if (isInputRange!R) {
>          enum rankOf = rankOf!(ElementType!R) + 1;
>      } else {
>          enum rankOf = 0;
>      }
> }
> 
> unittest {
>      static assert (rankOf!long == 0);
>      static assert (rankOf!(int[]) == 1);
>      static assert (rankOf!(int[][][]) == 3);
> }
> 
> void main() {
> }
> 
> Ali
> 
That's what I've done exactly)) Except I didn't tested against long.
Thanks for reply!