A couple of questions about arrays and slices

[Paul Backus]

On Thursday, 22 June 2023 at 00:10:19 UTC, Cecil Ward wrote:
> Is .reserve()’s argument scaled by the entry size after it is 
> supplied, that is it is quoted in elements or is it in bytes? 
> I’m not sure whether the runtime has a knowledge of the element 
> type so maybe it doesn’t know anything about scale factors, not 
> sure.

length, reserve, and capacity all use the same unit, which is 
elements.

reserve passes a TypeInfo instance to the runtime so that it 
knows the size of the elements. You can see the implementation 
here:

https://github.com/dlang/dmd/blob/v2.104.0/druntime/src/object.d#L3910