Dimensions in compile time

[Basile B.]

On Monday, 8 February 2021 at 11:42:45 UTC, Vindex wrote:
> size_t ndim(A)(A arr) {
>     return std.algorithm.count(typeid(A).to!string, '[');
> }
>
> Is there a way to find out the number of dimensions in an array 
> at compile time?

yeah.

---
template dimensionCount(T)
{
     static if (isArray!T)
     {
         static if (isMultiDimensionalArray!T)
         {
             alias DT = typeof(T.init[0]);
             enum dimensionCount = dimensionCount!DT + 1;
         }
         else enum dimensionCount = 1;
     }
     else enum dimensionCount = 0;
}
///
unittest
{
     static assert(dimensionCount!char == 0);
     static assert(dimensionCount!(string[]) == 1);
     static assert(dimensionCount!(int[]) == 1);
     static assert(dimensionCount!(int[][]) == 2);
     static assert(dimensionCount!(int[][][]) == 3);
}
---

that can be rewritten using some phobos traits too I think, but 
this piece of code is very old now, more like learner template.