Copy-On-Write (COW) Managed Containers?

[ikod]

On Tuesday, 20 October 2020 at 12:42:26 UTC, Per Nordlöw wrote:
> What are your thoughts on the pros and cons with copy-on-write 
> (COW) managed allocations in D, typically for containers such 
> as `std.container.Array`?

I use COW to create copy for hashmap bucket array if user decided 
to mutate container during byKey/byPair iteration. The only 
downside I see is temporary doubled memory usage. The benefits 
are clear - you can provide stable iterators.