How to get element type of a slice?

[jfondren]

On Thursday, 19 August 2021 at 03:32:47 UTC, Jesse Phillips wrote:
> On Thursday, 19 August 2021 at 03:29:03 UTC, Jesse Phillips 
> wrote:
>> On Tuesday, 17 August 2021 at 12:33:03 UTC, Ferhat Kurtulmuş 
>> wrote:
>>> On Tuesday, 17 August 2021 at 12:26:36 UTC, jfondren wrote:
>>>> On Tuesday, 17 August 2021 at 12:21:31 UTC, Ferhat Kurtulmuş 
>>>> wrote:
>>>>> [...]
>>>>
>>>> This one's not in std.traits:
>>>>
>>>> ```d
>>>> import std.range : ElementType;
>>>>
>>>> struct Point { int x, y; }
>>>>
>>>> unittest {
>>>>     Point[] points;
>>>>     assert(is(ElementType!(typeof(points)) == Point));
>>>> }
>>>> ```
>>>
>>> Hey, thank you again but, I don't want an instance of Point[] 
>>> I need:
>>>
>>> alias T = Point[];
>>>
>>> alias ElementOfPointSlice = .... // element type of T
>>
>
> Sorry last post was not complete. Not tested.
>
>
>     ```
>      alias T = Point[];
>     alias ElementOfPointSlice = ElementType!(T);
>
>      unittest {
>          assert(is(ElementOfPointSlice == Point));
>       }
>     ```

so, what's the problem? This passes tests:

```d
import std.range : ElementType;

struct Point { int x, y; }
alias T = Point[];
alias ElementOfPointSlice = ElementType!(T);

unittest {
     assert(is(ElementOfPointSlice == Point));
}
```