How to get element type of a slice?

[Steven Schveighoffer]

On 8/17/21 8:21 AM, Ferhat Kurtulmuş wrote:
> Hello folks,
> 
> Hope everyone is doing fine. Considering the following code, in the 
> first condition, I am extracting the type Point from the slice Point[]. 
> I searched in the std.traits, and could not find a neater solution 
> something like ElementTypeOf!T. Is there any neater solution for it? 
> Thanks in advance.
> 
> ```d
>      static if (isArray!VecPoint){
>          VecPoint dummy;
>          alias Point = typeof(dummy[0]);
>      } else static if (isRandomAccessRange!VecPoint){
>          alias ASeq2 = TemplateArgsOf!VecPoint;
>          alias Point = ASeq2[0];
>      } else
>          static assert(0, typeof(VecPoint).stringof ~ " type is not 
> supported");
> ```

If you want the element type of a range (i.e. the thing returned by 
`range.front`), you can use `ElementType!T` (from std.range.primitives).

This returns the element type of the range, which for every array 
*except* character arrays, gives you the element type of the array.

If you want always the element type of the array, even for auto-decoded 
ranges, use `ElementEncodingType!T`.

If you know it's an array, you can just use Paul's solution.

Your `isRandomAccessRange` branch seems very suspect.

-Steve