Empty associative array

[Mike Parker]

On Monday, 9 August 2021 at 12:16:44 UTC, deadalnix wrote:

>
> I find myself in a situation where I use an AA to cache some 
> computation results, and this cache might be necessary in a 
> couple of places in the application. It works great, unless the 
> cache is initially empty, in which case, every location ends up 
> with its own cache, defeating the whole point of caching these 
> results to begin with.

Do you mean you're passing the AA to those locations as a 
function parameter? In that case, it's no different from the 
behavior of dynamic arrays. The AA handle itself is not a 
reference, so you need to explicitly pass it by reference:

```d
void func(ref int[int] aa) { aa[3] = 3; }

void main()
{
     int[int] aa;
     func(aa);
     assert(aa[3] == 10);
}
```