associative array with Parallel

[jfondren]

On Thursday, 22 July 2021 at 05:46:25 UTC, seany wrote:
> But what about this :
>
>     int [ string ] ii;
>     ii.length = somearray.length;
>     foreach(i,dummy; parallel(somearray)) {
>       string j = generateUniqueString(i);
>       ii[j] ~= somefunc(dummy);
>     }
>
>
> Is this also guaranteed thread safe?

No. Consider 
https://programming.guide/hash-tables-open-vs-closed-addressing.html

In the open-addressing case, one thread may be searching the 
backing array while another thread is modifying it. In the 
closed-addressing case, one thread may be modifying a linked list 
while another thread is searching it.