isn't clear for me if reserve() does preallocate memory so that that operator like arr ~= x can use previously allocate memory by reserve() or it's just used in slices like b = arr[x .. y]?

On Monday, 1 March 2021 at 03:07:19 UTC, Jack wrote:
> isn't clear for me if reserve() does preallocate memory so that that operator like arr ~= x can use previously allocate memory by reserve() or it's just used in slices like b = arr[x .. y]?

Slicing never allocates memory. reserve extends the capacity for the ~= operator.

On Monday, 1 March 2021 at 03:12:42 UTC, Adam D. Ruppe wrote:
> On Monday, 1 March 2021 at 03:07:19 UTC, Jack wrote:
>> isn't clear for me if reserve() does preallocate memory so that that operator like arr ~= x can use previously allocate memory by reserve() or it's just used in slices like b = arr[x .. y]?
>
> Slicing never allocates memory. reserve extends the capacity for the ~= operator.

thanks

On Monday, 1 March 2021 at 03:07:19 UTC, Jack wrote:
> isn't clear for me if reserve() does preallocate memory so that that operator like arr ~= x can use previously allocate memory by reserve() or it's just used in slices like b = arr[x .. y]?

You may potentially find this article of use:

https://dlang.org/articles/d-array-article.html